75000 - Document - Document And Entity Information
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75010 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited)
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75020 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)
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75030 - Statement - Consolidated Statements of Income and Comprehensive Income
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75040 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited)
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75050 - Statement - Consolidated Statements of Cash Flows
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995455 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure
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995465 - Disclosure - Note 1 - Summary of Operations and Basis of Presentation
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995475 - Disclosure - Note 2 - Significant Accounting Policies
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995485 - Disclosure - Note 3 - Investments
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995495 - Disclosure - Note 4 - Derivative Instruments
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995505 - Disclosure - Note 5 - Fair Value Measurements
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995515 - Disclosure - Note 6 - Policy Acquisition Costs
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995525 - Disclosure - Note 7 - Intangible Assets and Goodwill
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995535 - Disclosure - Note 8 - Capitalized Assets
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995545 - Disclosure - Note 9 - Leases
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995555 - Disclosure - Note 10 - Reserve for Losses and Loss Adjustment Expenses
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995565 - Disclosure - Note 11 - Reinsurance
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995575 - Disclosure - Note 12 - Credit Agreements
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995585 - Disclosure - Note 13 - Stockholders' Equity
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995595 - Disclosure - Note 14 - Accumulated Other Comprehensive Income
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995605 - Disclosure - Note 15 - Underwriting Information
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995615 - Disclosure - Note 16 - Retirement and Post-employment Retirement Plans
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995625 - Disclosure - Note 17 - Income Taxes
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995635 - Disclosure - Note 18 - Earnings Per Share
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995645 - Disclosure - Note 19 - Statutory Financial Information
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995655 - Disclosure - Note 20 - Dividend Restrictions
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995665 - Disclosure - Note 21 - Commitments and Contingencies
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995675 - Disclosure - Note 22 - Variable Interest Entities ("VIEs")
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995685 - Disclosure - Note 23 - Business Acquisitions
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995695 - Disclosure - Note 24 - Subsequent Events
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995705 - Disclosure - Schedule II - Condensed Financial Information of Parent Company
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995715 - Disclosure - Schedule V - Valuation and Qualifying Accounts
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995725 - Disclosure - Significant Accounting Policies (Policies)
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995735 - Disclosure - Note 3 - Investments (Tables)
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995745 - Disclosure - Note 5 - Fair Value Measurements (Tables)
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995755 - Disclosure - Note 6 - Policy Acquisition Costs (Tables)
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995765 - Disclosure - Note 7 - Intangible Assets and Goodwill (Tables)
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995775 - Disclosure - Note 8 - Capitalized Assets (Tables)
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995785 - Disclosure - Note 9 - Leases (Tables)
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995795 - Disclosure - Note 10 - Reserve for Losses and Loss Adjustment Expenses (Tables)
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995805 - Disclosure - Note 11 - Reinsurance (Tables)
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995815 - Disclosure - Note 13 - Stockholders' Equity (Tables)
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995825 - Disclosure - Note 14 - Accumulated Other Comprehensive Income (Tables)
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995835 - Disclosure - Note 15 - Underwriting Information (Tables)
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995845 - Disclosure - Note 17 - Income Taxes (Tables)
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995855 - Disclosure - Note 18 - Earnings Per Share (Tables)
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995865 - Disclosure - Note 19 - Statutory Financial Information (Tables)
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995875 - Disclosure - Schedule II - Condensed Financial Information of Parent Company (Tables)
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995885 - Disclosure - Schedule V - Valuation and Qualifying Accounts (Tables)
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995895 - Disclosure - Note 1 - Summary of Operations and Basis of Presentation (Details Textual)
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995905 - Disclosure - Note 2 - Significant Accounting Policies (Details Textual)
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995915 - Disclosure - Note 3 - Investments (Details Textual)
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995925 - Disclosure - Note 3 - Investments - Summary of Available for Sale Investments (Details)
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995935 - Disclosure - Note 3 - Investments - Security Holdings in an Unrealized Loss Position (Details)
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995945 - Disclosure - Note 3 - Investments - The Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details)
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995955 - Disclosure - Note 3 - Investments - Schedule of Available-for-sale Net Unrealized Gains or Losses (Details)
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995965 - Disclosure - Note 3 - Investments - Summary of Net Investment Income (Details)
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995975 - Disclosure - Note 3 - Investments - Net Realized and Unrealized Investment Gains and Losses (Details)
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995985 - Disclosure - Note 4 - Derivative Instruments (Details Textual)
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995995 - Disclosure - Note 5 - Fair Value Measurements (Details Textual)
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996005 - Disclosure - Note 5 - Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)
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996015 - Disclosure - Note 6 - Policy Acquisition Costs - Schedule of Policy Acquisition Costs (Details)
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996025 - Disclosure - Note 7 - Intangible Assets and Goodwill - Schedule of Intangible Assets and Goodwill (Details)
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996035 - Disclosure - Note 7 - Intangible Assets and Goodwill (Details Textual)
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996045 - Disclosure - Note 8 - Capitalized Assets (Details Textual)
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996055 - Disclosure - Note 8 - Capitalized Assets - Schedule of Capitalized Assets (Details)
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996065 - Disclosure - Note 8 - Capitalized Assets - Schedule of Capitalized Assets (Details) 2
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996075 - Disclosure - Note 9 - Leases (Details Textual)
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996085 - Disclosure - Note 9 - Leases - Supplementary Lease Information (Details)
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996095 - Disclosure - Note 9 - Leases - Schedule of Future Minimum Lease Payments (Details)
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996105 - Disclosure - Note 9 - Leases - Schedule of Future Minimum Lease Payments (Details) 2
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996115 - Disclosure - Note 9 - Leases - Supplementary Lease Information (Details) (Parentheticals)
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996125 - Disclosure - Note 10 - Reserve for Losses and Loss Adjustment Expenses (Details Textual)
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996135 - Disclosure - Note 10 - Reserve for Losses and Loss Adjustment Expenses - Reconciliation of Changes in Reserve Balance for Losses and Loss Adjustment Expenses (Details)
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996145 - Disclosure - Note 10 - Reserve for Losses and Loss Adjustment Expenses - Schedule of Incurred Losses and Allocated Loss Adjustment Expenses on Homeowners' Insurance (Details)
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996155 - Disclosure - Note 10 - Reserve for Losses and Loss Adjustment Expenses - Schedule of Average Annual Percentage Payout of Incurred Claims on Homeowners' Insurance (Details)
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996165 - Disclosure - Note 10 - Reserve for Losses and Loss Adjustment Expenses - Schedule of Incurred Losses and Allocated Loss Adjustment Expenses on Special Property Insurance (Details)
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996175 - Disclosure - Note 10 - Reserve for Losses and Loss Adjustment Expenses - Schedule of Average Annual Percentage Payout of Incurred Claims on Special Property Insurance (Details)
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996185 - Disclosure - Note 10 - Reserve for Losses and Loss Adjustment Expenses - Schedule of Incurred Losses and Allocated Loss Adjustment Expenses on Other Insurance (Details)
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996195 - Disclosure - Note 10 - Reserve for Losses and Loss Adjustment Expenses - Schedule of Average Annual Percentage Payout of Incurred Claims on Other Insurance (Details)
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996205 - Disclosure - Note 10 - Reserve for Losses and Loss Adjustment Expenses - Reserve for Losses and Loss Adjustment Expenses - Reconciliation of Liability for Claims and Claim Adjustments Expenses (Details)
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996215 - Disclosure - Note 11 - Reinsurance (Details Textual)
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996225 - Disclosure - Note 11 - Reinsurance - Schedule of Ceded Premiums (Details)
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996235 - Disclosure - Note 11 - Reinsurance - Effects of Reinsurance (Details)
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996245 - Disclosure - Note 11 - Reinsurance - Effects of Reinsurance (Details) 2
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996255 - Disclosure - Note 12 - Credit Agreements (Details Textual)
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996265 - Disclosure - Note 13 - Stockholders' Equity (Details Textual)
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996275 - Disclosure - Note 13 - Stockholders' Equity - Common Stock Reserved for Future Issuance (Details)
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996285 - Disclosure - Note 13 - Stockholders' Equity - Schedule of Stock-based Compensation (Details)
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996295 - Disclosure - Note 13 - Stockholders' Equity - Summary of Stock Option Activity (Details)
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996305 - Disclosure - Note 13 - Stockholders' Equity - Summary of RSU Transactions (Details)
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996315 - Disclosure - Note 13 - Stockholders' Equity - Schedule of Key Valuation Input Assumptions Used in Monte Carlo Simulation Relative to Awards Granted (Details)
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996325 - Disclosure - Note 13 - Stockholders' Equity - Summary of PSU Transactions (Details)
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996335 - Disclosure - Note 14 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss) (Details)
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996345 - Disclosure - Note 14 - Accumulated Other Comprehensive Income (Details Textual)
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996355 - Disclosure - Note 15 - Underwriting Information - Schedule of Gross Written Premiums (Details)
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996365 - Disclosure - Note 15 - Underwriting Information (Details Textual)
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996375 - Disclosure - Note 16 - Retirement and Post-employment Retirement Plans (Details Textual)
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996385 - Disclosure - Note 17 - Income Taxes (Details Textual)
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996395 - Disclosure - Note 17 - Income Taxes - Components of Income Tax Expense (Details)
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996405 - Disclosure - Note 17 - Income Taxes - Deferred Tax Assets and Liabilities (Details)
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996415 - Disclosure - Note 17 - Income Taxes - Reconciliation of Federal Income Tax Rate (Details)
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996425 - Disclosure - Note 17 - Income Taxes - Schedule of Income Taxes Paid (Details)
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996435 - Disclosure - Note 18 - Earnings Per Share - Earnings Per Share of Common Stock (Details)
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996445 - Disclosure - Note 19 - Statutory Financial Information - Schedule of Statutory Net Income and Statutory Capital Surplus (Details)
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996455 - Disclosure - Note 19 - Statutory Financial Information (Details Textual)
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996465 - Disclosure - Note 20 - Dividend Restrictions (Details Textual)
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996475 - Disclosure - Note 21 - Commitments and Contingencies (Details Textual)
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996485 - Disclosure - Note 22 - Variable Interest Entities ("VIEs") (Details Textual)
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996495 - Disclosure - Note 23 - Business Acquisitions (Details Textual)
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996505 - Disclosure - Note 24 - Subsequent Event - Additional Information (Details Textual)
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996515 - Disclosure - Schedule II - Condensed Financial Information of Parent - Balance Sheets (Details)
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996525 - Disclosure - Schedule II - Condensed Financial Information of Parent - Balance Sheets (Details) (Parentheticals)
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996535 - Disclosure - Schedule II - Condensed Financial Information of Parent Company - Statements of Income (Details)
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996545 - Disclosure - Schedule II - Condensed Financial Information of Parent Company - Statements of Cash Flows (Details)
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996555 - Disclosure - Schedule V - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details)
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999009 - Disclosure - Anchoring
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Equity securities
Equity Securities, FV-NI, Total
Equity securities, at fair value: (cost: $3,725 in 2025, $1,725 in 2024)
Equity securities, at fair value (cost: $81,772 in 2025; $32,987 in 2024)
Released, weighted average grant date fair value (in dollars per share)
Proceeds from sale of property and equipment
Proceeds from Sale of Property, Plant, and Equipment
Proceeds from Sale of Property, Plant, and Equipment, Total
Reinsurance recoverable on unpaid losses and loss adjustment expenses
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments, Ending Balance
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments, Beginning Balance
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments, Total
Add: Reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period
Concentration Risk Type [Axis]
Schedule of Nonvested Performance-Based Units Activity [Table Text Block]
Short-Duration Insurance Contracts, Accident Year [Axis]
Entity Incorporation, State or Country Code
Preferred Stock, Shares Issued (in shares)
Preferred Stock, Shares Issued (in shares)
us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
Current year
Capitalized Computer Software, Gross
Capitalized Software, cost
Relating to second largest program administrator.
Second Largest Program Administrator [Member]
Schedule of Income Taxes Amount [Table Text Block]
Schedule of income taxes amount.
Schedule of Income Taxes Paid
Due within one year, Fair Value
Due within one year, Fair Value
Average price per share
Shares Acquired, Average Cost Per Share
Plan Name [Axis]
12 Months or Longer, fair value
12 Months or Longer, fair value
Equity [Abstract]
Entity Current Reporting Status
US Government Agencies Debt Securities [Member]
US Government Agencies Debt Securities [Member]
Acquisition expenses, net of ceding commissions and fronting fees
Total Acquisition expenses
Other comprehensive income (loss) before reclassification, net of tax
Other comprehensive income before reclassification
Fair Value, Inputs, Level 2 [Member]
Commitments and Contingencies Disclosure [Text Block]
Common Stock, Shares Authorized (in shares)
Common Stock, Shares Authorized (in shares)
Accounts Receivable, after Allowance for Credit Loss
Accounts Receivable, after Allowance for Credit Loss, Total
Receivables from subsidiaries
Chris Uchida [Member]
Chris Uchida.
us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
Total incurred
Investment, Policy [Policy Text Block]
Amount of increase (decrease) in additional paid in capital (APIC) resulting from policyholder contribution to surplus.
Policyholder contribution to surplus
Policy holder contribution to surplus
Product and Service [Axis]
Document Fiscal Period Focus
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Capitalized Computer Software, Amortization
Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB) as percentage of statutory admitted assets,
plmr_FederalHomeLoanBankAdvancesGeneralDebtObligationsMaximumAmountAvailableAsPercentageOfStatutoryAdmittedAssets
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available as Percentage of Statutory Admitted Assets
Entity Shell Company
Relating to the largest reinsurer two.
Largest Reinsurer Two [Member]
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
Segment Reporting, Policy [Policy Text Block]
Segment Reporting
Cash and cash equivalents
Cash and cash equivalents
Cash and Cash Equivalent, Total
Number Of Additional Stock Price Milestones Achieved
Represents number of additional stock price milestones achieved.
Number of Additional Stock Price Milestones Achieved
Duration of award service period under share-based compensation arrangement.
plmr_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardServicePeriod
Share-based Compensation Arrangement by Share-based Payment Award, Award Service Period (Year)
Represents the amount of dividend received from subsidiary.
plmr_DividendsReceivedFromSubsidiary
Dividends Received from Subsidiary
Cybersecurity Risk Management, Strategy, and Governance [Abstract]
Common Stock, Shares, Issued (in shares)
Common Stock, Shares, Issued (in shares)
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]
TEXAS
Cybersecurity Risk Board of Directors Oversight [Text Block]
Short-Duration Insurance Contract, Accident Year 2021 [Member]
Statement [Table]
Internal Revenue Service (IRS) [Member]
Palomar Specialty Insurance Company and Palomar Excess And Surplus Insurance Company [Member]
Palomar Specialty Insurance Company and Palomar Excess And Surplus Insurance Company.
PSIC & PESIC [Member]
Other Program Administrators [Member]
Relating to other program administrators.
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)
Share Repurchase Program, Remaining Authorized, Number of Shares
Statement [Line Items]
Treasury Stock, Value, Acquired, Cost Method
Treasury Stock, Value, Acquired, Cost Method
Business Combination [Domain]
Payments on Line of Credit
Payments on Line of Credit
Payments on line of credit.
Put Option [Member]
livestock put options [Member]
Inland Marine [Member]
Inland Marine.
Inland Marine and Other Property
Entity Filer Category
Variable Interest Entity Disclosure [Text Block]
Variable Interest Entities ("VIEs")
Amount of deferred tax liability attributable to state taxes.
plmr_DeferredTaxLiabilitiesStateTaxLiability
State deferred tax liability
State deferred tax liability
us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
Amounts reclassified from AOCI, net of tax
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders' equity
Premiums Receivable, Basis of Accounting, Policy [Policy Text Block]
Equity [Table]
Equity.
us-gaap_PaymentsToAcquireMarketableSecurities
Purchases of equity securities
Unsecured Credit Facilities [Member]
Unsecured credit facilities.
Unsecured Credit Facilities
Long-Lived Tangible Asset [Axis]
Short-Duration Insurance Contracts, Historical Claims Duration, Year 10
Payout percentage, year 10
Payout percentage, year 10
Liability Reserve Estimate, Policy [Policy Text Block]
Business Combination, Voting Equity Interest Acquired, Percentage
Business Acquisition, Percentage of Voting Interests Acquired
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]
Issuance of common stock via equity incentive plan (in shares)
Issuance of common stock via equity incentive plan (in shares)
Proceeds from Dividends Received
Dividend received from subsidiary
Reserve for losses and loss adjustment expenses
Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve
Relating to other liability claims.
Other Liability Claims [Member]
Change in allowance for credit losses
Deferred Tax Assets, Valuation Allowance
Valuation allowance
Valuation allowance
Notes Tables
Notes Tables
us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Expense computed at federal tax rate, percent
Subsequent Event [Line Items]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount, Total
Nontaxable or nondeductible items
Cybersecurity Risk Management Third Party Engaged [Flag]
Documents Incorporated by Reference [Text Block]
Reinsurance Disclosures [Abstract]
HAWAII
Derivative Asset, Notional Amount
Derivative assets, notional amount
Goodwill
Goodwill, Ending Balance
Goodwill, Beginning Balance
Goodwill, Total
Goodwill
Goodwill from acquisitions:
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Reconciliation, Percent
Effective Income Tax Rate Reconciliation, Percent, Total
Income tax expense, percent
Finite-lived intangibles:
Finite-Lived Intangible Assets, Gross [Abstract]
Interest income
The entire disclosure for statutory financial information.
Statutory Financial Information Disclosure [Text Block]
Income Tax Jurisdiction [Axis]
Geographical [Domain]
Identification of the acquiree in a material business combination (or series of individually immaterial business combinations), which may include the name or other type of identification of the acquiree.
First Indemnity of America Insurance Company [Member]
FIA [Member]
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]
Asset-Backed Securities [Member]
Asset-Backed Securities [Member]
Due after ten years, Amortized Cost
Due after ten years, Amortized Cost
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay
Variable Interest Entity [Table]
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Represents percentage of gross written premiums.
Percentage of Gross Written Premiums
Additional paid-in capital
Additional paid-in capital
Unrealized gains on investments
Deferred Tax Liabilities, Investments
Unrealized gains on investments
Relating to other liability occurrence.
Other Liability Occurrence [Member]
Related Party [Member]
FIA and AAP Acquisitions [Member]
FIA and AAP acquisitions.
Significant Accounting Policies [Text Block]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life
Finite-Lived Intangible Asset, Useful Life (Year)
Vesting [Domain]
Disaggregation of Revenue [Table]
Cybersecurity Risk Management, Strategy, and Governance [Table]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense
Valuation allowance, additions
Reinsurance [Text Block]
Ceded Credit Risk [Table Text Block]
Investments Classified by Contractual Maturity Date [Table Text Block]
Customer relationships
Finite-Lived Customer Relationships, Gross
Basic earnings per share (in dollars per share)
Basic (in dollars per share)
Disaggregation of Revenue [Table Text Block]
Retirement Benefits [Text Block]
Policyholder Benefits and Claims Incurred, Direct
Losses and LAE, direct
Options, Outstanding, Number (in shares)
Outstanding, options (in shares)
Outstanding, options (in shares)
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]
Reinsurance Accounting Policy [Policy Text Block]
Variable Interest Entity [Line Items]
Revolving Credit Facility [Member]
Revolving Credit Facility
Debt Securities, Unrealized Gain (Loss)
Debt Securities, Unrealized Gain (Loss), Total
Fixed maturities
us-gaap_ProceedsFromSaleOfEquitySecuritiesFvNi
Proceeds from Sale of Equity Securities, FV-NI
Adjustments to reconcile net income to net cash provided by operating activities:
Lessee, Operating Lease, Liability, to be Paid, Year Five
2030
Increase DecreaseIn Ceded Premiums Payable
The increase (decrease) during the reporting period in the aggregate amount of ceded premiums payables.
Ceded premiums payable
Add: Balance acquired from FIA(1)
Balance acquired from FIA
Add: Balance acquired from FIA
Income Tax Paid, Federal, after Refund Received
Income Tax Paid, Federal, after Refund Received, Total
Federal
Cash paid for federal income taxes
Domestic Tax Jurisdiction [Member]
Valuation allowance, deductions
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction
Sales and maturities of fixed maturity securities
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale, Total
Parent Company [Member]
Effective Income Tax Rate Reconciliation [Table]
Product Concentration Risk [Member]
Internally developed software
Deferred Tax Liabilities, Deferred Expense, Capitalized Software
Internally developed software
Stockholders' equity:
Stockholders' equity:
COLORADO
Entity Small Business
Line of Credit Facility, Commitment Fee Amount
Retained earnings
Retained earnings
Retained Earnings (Accumulated Deficit), Total
Effect of cross-border tax laws
Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount
Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount, Total
Entity Well-known Seasoned Issuer
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Options cancelled (in shares)
Represents Palomar Specialty Insurance Company.
Palomar Specialty Insurance Company [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value
us-gaap_ReinsuranceRetentionAmountRetainedPerEvent
Reinsurance, Amount Retained, Per Event
The amount of maximum dividend or distribution that may be made without the prior approval of Oregon and California Insurance Commissioners.
plmr_ThresholdDividendOrDistributionWithoutApprovalOfOregonAndCaliforniaInsuranceCommissioners
Threshold Dividend or Distribution without Approval of Oregon and California Insurance Commissioners
Fair value amount of catastrophe bond.
plmr_CatastropheBondFaceValue
Catastrophe Bond, Face Value
Dividend Restrictions [Abstract]
Dividend restrictions.
Common Share equivalents (in shares)
Common Share equivalents
Catastrophic Event [Axis]
Amendment Flag
Net realized investment losses
Net realized investment gains (losses)
Product and Service [Domain]
Loss Contingencies [Line Items]
Short-Duration Insurance Contracts, Historical Claims Duration, Year Seven
Payout percentage, year 7
Payout percentage, year 7
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
Expense computed at federal tax rate
Deferred Policy Acquisition Cost, Amortization Expense, Other
Other acquisition costs (net)
Effects of Reinsurance [Table Text Block]
Earnings Per Share, Policy [Policy Text Block]
Non-Rule 10b5-1 Arrangement Modified
Non Rule 10b 51 Arr Modified Flag
Non Rule 10b 51 Arr Modified Flag.
Entity Address, Postal Zip Code
Net cash provided by operating activities
Net cash provided by operating activities
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description
Common Stock [Member]
Common Stock [Member]
Losses and loss adjustment expenses
Losses and loss adjustment expenses
Cybersecurity Risk Role of Management [Text Block]
Tax Credit Carryforward, Amount
Lessee, Operating Lease, Liability, to be Paid, Year Three
2028
Capitalized assets, accumulated depreciation
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total
Amortization of Debt Discount (Premium)
Amortization of premium on fixed maturity securities
Debt Securities, Available-for-Sale [Line Items]
Schedule of Key Valuation Input Used in Monte Carlo Simulation [Table Text Block]
Schedule Of Key Valuation Input Assumptions Used In The Monte Carlo Simulation Relative To Awards Granted [Table Text Block]
Schedule of key valuation input assumptions used in the monte carlo simulation relative to awards granted.
Entity Address, Address Line One
Total deferred tax liabilities
Deferred Tax Liabilities, Gross
Total deferred tax liabilities
Deferred tax liabilities
Deferred income tax expense (benefit)
Deferred Income Taxes and Tax Credits
Deferred Income Taxes and Tax Credits, Total
Fair Value Hierarchy and NAV [Axis]
Earnings Per Share [Abstract]
Income Tax, Policy [Policy Text Block]
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]
Supplementary cash flow information:
Derivative Asset
Derivative Asset, Total
Derivative assets at fair value
Goodwill and Intangible Assets Disclosure [Text Block]
Short-Duration Insurance Contracts, Accident Year [Domain]
Operating Lease, Right-of-Use Asset
Operating lease ROU assets
Fair value
Debt Securities, Available-for-Sale, Unrealized Loss Position
Fair value
Total deferred tax assets
Deferred Tax Assets, Gross
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]
Income taxes payable
Increase (Decrease) in Income Taxes
us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
Purchases of fixed maturity securities
Earthquake [Member]
Document Type
Change in unearned premiums
Statutory Financial Information [Abstract]
Statutory financial information.
Goodwill and Intangible Assets, Policy [Policy Text Block]
Cash paid for income taxes
Total income taxes paid
Total income taxes paid
Entity Central Index Key
Line of Credit Facility [Table]
Investments, Debt and Equity Securities [Abstract]
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]
Net increase (decrease) in cash, cash equivalents and restricted cash
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Subsequent Event Type [Domain]
Goodwill and intangible assets, net
Goodwill and intangible assets, net
Total Goodwill and intangible assets, net
Condensed Balance Sheet [Table Text Block]
Accrued investment income
Accrued investment income
Repurchases of common stock (in shares)
Stock Repurchased and Retired During Period, Shares
Repurchases of common stock (in shares)
Prior accident year in which covered event occurs under terms of short-duration insurance contract.
Short-Duration Insurance Contract, Prior Accident Years [Member]
Option Indexed to Issuer's Equity [Axis]
Common Stock, Par Value (in dollars per share)
Common Stock, Par or Stated Value Per Share (in dollars per share)
Common Stock, Par Value (in dollars per share)
Other comprehensive income (loss)
Other comprehensive income (loss), net of tax
Other comprehensive (loss) income
Represents the number of largest reinsurers.
plmr_NumberOfLargestReinsurers
Number of Largest Reinsurers
Direct Premiums Earned
Earned premiums, direct
Share-Based Payment Arrangement, Tranche One [Member]
Liabilities:
Liabilities:
Outstanding, options, weighted average remaining contractual term (Year)
Available-for-Sale, Amortized Cost
Amortized Cost
Available-for-Sale, Amortized Cost
Total, Fair Value
Debt Securities, Available-for-sale
Fixed maturity securities available for sale, at fair value (amortized cost: $1,227,605 in 2025; $973,330 in 2024)
Fixed maturity securities available for sale, at fair value (amortized cost: $160,793 in 2025, $153,425 in 2024)
AAP [Member]
AAP.
AAP [Member]
Relating to Homeowners Insurance Product Line.
Homeowners Insurance Product Line [Member]
Document Financial Statement Error Correction [Flag]
us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Options exercised, options (in shares)
Debt Disclosure [Abstract]
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net
Insurance contracts, incurred but not reported liabilities
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for dividend and tax exempt interest.
plmr_EffectiveIncomeTaxRateReconciliationDeductionsDividendsAndTaxExemptInterest
Dividend received deduction and tax-exempt interest, percent
Income Tax Paid [Line Items]
Income tax paid.
Represents number of dates for achievement of milestone stock price.
plmr_NumberOfDaysAchievementOfMilestoneStockPrice
Number of Days, Achievement of Milestone Stock Price
Current Fiscal Year End Date
Amount of cash inflow from policyholders contribution to surplus.
plmr_ProceedsFromPolicyholdersContributionToSurplus
Policy holder contribution to surplus
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total
Investment in subsidiaries
Amount of policy benefits and loss adjustment expenses incurred for policies ceded.
plmr_PolicyholderBenefitsAndLossAdjustmentExpensesIncurredCeded
LAE, ceded
Annual Revenue
Annual revenue.
Annual revenue
Assumed Premiums Earned
Earned premiums, assumed
Ceded Premiums Earned
Earned premiums, ceded
CALIFORNIA
Customer Relationships [Member]
Entity Address, State or Province
Equity Instruments Other than Options, Nonvested, Number (in shares)
Non-vested, shares (in shares)
Non-vested, shares (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)
Internal Use Software, Policy [Policy Text Block]
Purchase of policy renewal rights
Payment To Acquire Policy Renewal Rights
Payment to acquire policy renewal rights.
Short-Duration Insurance Contracts, Accident Year 2015 [Member]
Other Insurance Lines [Member]
Other insurance lines.
Other Insurance Lines [Member]
Preferred Stock, Shares Outstanding (in shares)
Preferred Stock, Shares Outstanding (in shares)
Preferred Stock, Shares Outstanding, Ending Balance
Preferred Stock, Shares Outstanding, Beginning Balance
us-gaap_ComprehensiveIncomeNetOfTax
Total comprehensive income
OREGON
Available-for-sale, Accumulated Gross Unrealized Gain
Available-for-sale, Accumulated Gross Unrealized Gain
us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Total (in shares)
Geographical [Axis]
Line of Credit Facility, Lender [Domain]
Represents special revenue excluding asset backed securities.
Special Revenue Excluding Asset Backed Securities [Member]
Special Revenue Excluding Asset Backed Securities [Member]
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount
State and local income tax, net of federal (national) income tax effect
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences for lease liabilities.
Lease Liability
Performance Shares [Member]
Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and loss adjustment expenses incurred.
LAE, net
LAE, net
Deferred tax assets, net
Deferred tax assets, net
Deferred tax asset
Sales of equity securities
Subsequent Event [Member]
Subsequent Event
Equity [Line Items]
Equity.
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Amount reclassified to earnings
Property, Plant and Equipment [Abstract]
Short-Duration Insurance Contracts, Accident Year 2016 [Member]
Other underwriting expenses
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from losses and loss-adjustment expense reserve discount.
Losses and LAE reserve discount
Operating Loss Carryforwards [Line Items]
WASHINGTON
Year 2021 [Member]
Represents year 2021.
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage
Basis of Presentation and Significant Accounting Policies [Text Block]
Represents corporate debt securities and other debt obligations.
Corporate Debt Securities and Other Debt Obligations [Member]
Corporate Debt Securities and Other Debt Obligations [Member]
us-gaap_InterestExpenseDebt
Interest Expense, Debt
Amount of premium taxes which increases deferred policy acquisition cost.
Premium taxes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Proceeds from Sale of Debt Securities, Available-for-Sale
State and Local Jurisdiction [Member]
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments [Member]
Share-Based Payment Arrangement, Cost by Plan [Table Text Block]
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Customer [Domain]
us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments
Finite-Lived Intangible Assets, Major Class Name [Domain]
Income Tax Paid [Table]
Income tax paid.
Represents other states.
Other States [Member]
Business Combination, Consideration Transferred
Business Combination, Consideration Transferred
Business Combination, Consideration Transferred, Total
Policyholder Benefits and Claims Incurred, Assumed
Losses and LAE, assumed
Preferred stock, $0.0001 par value, 5,000,000 shares authorized, 0 shares issued and outstanding as of December 31, 2025 and December 31, 2024
Preferred stock, $0.0001 par value, 5,000,000 shares authorized as of December 31, 2025 and December 31, 2024, 0 shares issued and outstanding as of December 31, 2025 and December 31, 2024
Preferred stock, $0.0001 par value, 5,000,000 shares authorized as of December 31, 2025 and December 31, 2024, 0 shares issued and outstanding as of December 31, 2025 and December 31, 2024
Debt Instrument, Maturity Date
Maturity Date
Mortgage and asset-backed securities, Amortized Cost
Mortgage and asset-backed securities, Amortized Cost
Minimum [Member]
Granted, weighted average grant date fair value (in dollars per share)
Weighted average fair value
Financial Instrument [Axis]
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from capitalized organizational costs.
Capitalized organizational costs
Short-Duration Insurance Contracts, Historical Claims Duration, Year Five
Payout percentage, year 5
Reinsurance recoverables
Increase (Decrease) in Reinsurance Recoverable
Reinsurance recoverables
Reinsurance recoverables
Represents the increase in the number of shares available for grant under the plan as a percentage of common stock issued and outstanding as of the immediately preceding fiscal year end date.
plmr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageNumberOfAdditionalSharesAvailableForGrant
Share Based Compensation Arrangement By Share Based Payment Award Percentage, Number of Additional Shares Available for Grant
Deferred compensation
Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss
Fair Value, Inputs, Level 3 [Member]
Ceded unearned premiums
Ceded unearned premiums
Prepaid Reinsurance Premiums
Segment Reporting [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Represents inland marine and other properties.
Inland Marine and Other Property [Member]
Stock Repurchased and Retired During Period, Value
Repurchases of common stock
Repurchases of common stock
Amount of Ceding commissions which decreases deferred policy acquisition cost.
plmr_DeferredPolicyAcquisitionCostsCedingCommissions
Ceding commissions and fronting fees
Ceding commissions and fronting fees
Note 2 - Investments - Summary of Available for Sale Investments (Details)
us-gaap_SharesOutstanding
Balance (in shares)
Balance (in shares)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]
Operating Loss Carryforwards
us-gaap_PaymentsForLossesAndLossAdjustmentExpense
Total payments
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Non-vested outstanding, weighted average grant date fair value (in dollars per share)
Non-vested outstanding, weighted average grant date fair value (in dollars per share)
Indefinite-Lived Intangible Assets [Line Items]
Excess of loss protection amount of reinsurance policy.
plmr_ReinsurancePolicyExcessOfLossProtectionAmount
Reinsurance Policy, Excess of Loss Protection Amount
Operating lease liabilities
Operating Lease, Liability
Total operating lease liability
Auditor Firm ID
Ceded premium payable
Ceded premium payable
Relating to the three largest reinsurers.
Three Largest Reinsurers [Member]
us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Debt Instrument, Basis Spread on Variable Rate
Increase (Decrease) in Premiums Receivable
Premium receivable
Capitalized Computer Software, Net
Capitalized Computer Software, Net, Ending Balance
Capitalized Computer Software, Net, Beginning Balance
Capitalized Software, net
Equity Securities, Cost
Equity Securities, Cost
Amount of unrealized gain (loss) on investment in equity method security measured at fair value with change in fair value recognized in net income (FV-NI).
Net unrealized gains (losses) on equity method investment
Net unrealized losses on equity method investment
Statutory Accounting Practices [Line Items]
Short-Duration Insurance Contracts, Historical Claims Duration, Year Nine
Payout percentage, year 9
Payout percentage, year 9
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for dividend and tax exempt interest.
plmr_IncomeTaxReconciliationDividendReceivedDeductionAndTaxExemptInterest
Dividend received deduction and tax-exempt interest
Concentration Risk Benchmark [Axis]
Net proceeds from (purchases of) derivative contracts
Gain (Loss) on Derivative Instruments, Net, Pretax
Gain (Loss) on Derivative Instruments, Net, Pretax, Total
Gain on derivative instruments, net, pretax
Reserve for losses and loss adjustment expenses
Reserve for losses and loss adjustment expenses
Liability for Claims and Claims Adjustment Expense, Ending Balance
Liability for Claims and Claims Adjustment Expense, Beginning Balance
Liability for Claims and Claims Adjustment Expense, Total
Reserve for losses and loss adjustment expenses gross of reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent
Change in the valuation allowance impacting the effective tax rate, percent
Payments to Acquire Equity Method Investments
Purchase of equity method investment
Reduction In Income Tax Expense Provision deducting from Internally Developed Software Expenses
Reduction in income tax expense provision deducting from internally developed software expenses.
Reduction in income tax expense provision deducting from internally developed software expenses
Percentage of additional spread for default on basis spread on variable rate of debt instrument.
plmr_DebtInstrumentBasisSpreadOnVariableRateAdditionalSpreadForDefault
Debt Instrument, Basis Spread on Variable Rate, Additional Spread for Default
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]
Loss Contingencies [Table]
Basic (in shares)
Basic
Gain (Loss) on Securities [Table Text Block]
Represents vesting on first anniversary.
Share Based Payment Arrangement Tranche One First Anniversary [Member]
Document Information [Line Items]
Segment Reporting, Expense Information Used by CODM, Description
Options [Member]
Options
Income Tax Regime
Percentage of income tax regime.
Income tax regime, percent
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Deferred Tax Liabilities, Leasing Arrangements
Right-of-use Asset
Right-of-use Asset
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Special Property Product Line [Member]
Special property product line.
Special Property Product Line [Member]
us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
12 Months or Longer, Accumulated Loss
Long-Lived Tangible Asset [Domain]
Funds held under reinsurance treaty
Funds held under reinsurance treaty
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]
Subsequent Events [Text Block]
Subsequent Events [Text Block]
Effective Income Tax Rate Reconciliation, Tax Credit, Percent
Effective Income Tax Rate Reconciliation, Tax Credit, Percent, Total
Tax credits, percent
Long-Term Debt
Long-Term Debt, Total
Cash Received From Subsidiary
Cash received from subsidiary
Cash received from subsidiaries
Variable Rate [Domain]
Angela Grant [Member]
Angela Grant [Member]
Reinsurance XOL Treaty Retention Amount Retained Per Event
Reinsurance xol treaty retention amount retained per event.
Reinsurance XOL treaty retention amount retained per event
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangibles:
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount
Changes in valuation allowances
Change in the valuation allowance impacting the effective tax rate
us-gaap_StockholdersEquity
Balance
Balance
Total stockholders' equity
Equity, Attributable to Parent
Preferred Stock, Par Value (in dollars per share)
Preferred Stock, Par or Stated Value Per Share (in dollars per share)
Preferred Stock, Par Value (in dollars per share)
Basis of Accounting, Policy [Policy Text Block]
Basis of Presentation
Cash paid for state income taxes
Proceeds from Income Tax Refund, State and Local
Statement of Stockholders' Equity [Abstract]
Share-Based Payment Arrangement, Tranche Two [Member]
Equity method investment
Equity method investment
Federal income tax (expense) benefit
us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax
Represents Mac Armstrong.
Mac Armstrong [Member]
Use of Estimates, Policy [Policy Text Block]
Use of Estimates
Relating to property lines.
Property Lines [Member]
Leasehold Improvements [Member]
Other comprehensive income (loss) before reclassification, net of tax
us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent
Condensed Income Statement [Table Text Block]
Fair Value Disclosures [Text Block]
Insurance, Other [Member]
Prepaid expenses and other assets
Prepaid expenses and other assets
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Revenue Recognition, Premiums Earned, Policy [Policy Text Block]
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]
Home Owners Insurance Product Line [member]
Home owners insurance product line.
Homeowners Insurance Product Line [Member]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]
Plan Name [Domain]
Interest expense
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Entity [Domain]
Represents the number of states in which the company underwrites catastrophe insurance on admitted basis.
plmr_NumberOfStatesCompanyUnderwritesCatastropheInsuranceOnAdmittedBasis
Number Of States Company Underwrites Catastrophe Insurance On Admitted Basis
Building [Member]
Buildings [Member]
Gains on sales of equity securities
Due after ten years, Fair Value
Due after ten years, Fair Value
Credit Facility [Axis]
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block]
Impairment, Long-Lived Asset, Held-for-Use
Impairment, Long-Lived Asset, Held-for-Use, Total
Vested and Exercisable, options, weighted average exercise price (in dollars per share)
State
Current State and Local Tax Expense (Benefit)
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]
Amortization of net policy acquisition costs
Deferred Policy Acquisition Costs, Amortization Expense, Excluding Accrued Interest
Amortization of net policy acquisition costs
Debt and Equity Securities, Unrealized Gain (Loss) [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
Accrued Income Taxes
Accrued Income Taxes, Total
Income taxes payable
Income taxes payable
Related and Nonrelated Parties [Axis]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount
Other
Property, Plant and Equipment, Policy [Policy Text Block]
Taxes Payable
Taxes Payable, Total
Federal income tax payable
Payout percentage, year 1
Short-Duration Insurance Contracts, Historical Claims Duration, Year One
Entity Address, City or Town
Treasury Stock, Shares, Acquired (in shares)
Stock Repurchased During Period, Shares
Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract]
Security Exchange Name
Credit Facility [Domain]
Indefinite-Lived Intangible Assets (Excluding Goodwill)
Indefinite-Lived Intangible Assets (Excluding Goodwill), Ending Balance
Indefinite-Lived Intangible Assets (Excluding Goodwill), Beginning Balance
Indefinite-Lived Intangible Assets (Excluding Goodwill), Total
State insurance licenses
Short-Duration Insurance Contracts, Historical Claims Duration, Year Four
Payout percentage, year 4
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Other, percent
Property, Plant and Equipment, Gross
Property, Plant and Equipment, Gross, Ending Balance
Property, Plant and Equipment, Gross, Beginning Balance
Property, Plant and Equipment, Gross, Total
Capitalized assets, cost
us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Reserve for losses and loss adjustment expense, net of reinsurance
Reserve for losses and loss adjustment expense, net of reinsurance recoverables at beginning of period
Reserve for losses and loss adjustment expense net of reinsurance recoverables at end of period
Counterparty Name [Axis]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Loss before income taxes
Income before income taxes
Concentration Risk Type [Domain]
Reinsurance recoverable on paid losses and loss adjustment expenses
Reinsurance recoverable on paid losses and loss adjustment expenses
Amount of realized loss on investment in debt and equity securities.
plmr_DebtAndEquitySecuritiesRealizedLoss
Total realized losses
Liability for Claims and Claims Adjustment Expense [Table]
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss, Total
Fixed maturities securities, amortized cost
Deferred Policy Acquisition Costs Disclosures [Abstract]
Reinsurance Retention [Line Items]
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent
Foreign tax effects, percent
Executive Officer [Member]
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation, Total
Cash and cash equivalents at end of period
Cash and cash equivalents at beginning of period
BERMUDA
Cash paid for interest
Statistical Measurement [Domain]
Amount of realized gain on investment in debt and equity securities.
plmr_DebtAndEquitySecuritiesRealizedGain
Total realized gains
Stock-Based Compensation Expense
Stock-based compensation expense
Document Period End Date
Title and Position [Axis]
Fair Value Hierarchy and NAV [Domain]
Defined Contribution Plan, Cost
ICFR Auditor Attestation Flag
Represents fronting premium.
Fronting Premium [Member]
Fronting
Statement of Financial Position [Abstract]
Restricted Stock Units (RSUs) [Member]
Loss Contingency Nature [Axis]
us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss
Losses on sales of fixed maturity securities
Loss Contingency, Nature [Domain]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal
Loss on asset disposal
Loss on asset disposal
Amount of policy benefits and loss incurred for policies assumed.
Losses, assumed
Vesting [Axis]
Other comprehensive income, net:
Represents the amount of loss and loss adjustment expense reserve redundancy.
plmr_LossAndLossAdjustmentExpenseReserveRedundancy
Loss and Loss Adjustment Expense Reserve Redundancy
us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions
FIA [Member]
FIA.
FIA [Member]
Expenses:
Total Current
Current
Current Income Tax Expense (Benefit)
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent
Effect of changes in tax laws or rates enacted in the current period, percent
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Amount
Meals & entertainment, penalties & parking
Total liabilities
Liabilities
Financial Instruments [Domain]
Relating to reinsurance nonproportional assumed property.
Reinsurance Nonproportional Assumed Property [Member]
Deferred Tax Assets, Investments
Unrealized losses on investments
us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent
Amounts reclassified from AOCI
Premiums Written, Gross, Total
Premiums Written, Gross
Total gross written premiums
Gross written premiums
Term
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period
Loss Contingency, Estimate of Possible Loss
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount
Foreign tax effects
Lessee, Operating Lease, Liability, to be Paid, Year Two
2027
Restricted cash
Restricted cash
Period costs
Deferred Policy Acquisition Costs Amortization Benefit Accrued Interest
Deferred policy acquisition costs amortization benefit accrued interest.
Schedule Of Reconciliation Of Liability For Claims And Claim Adjustment Expenses [Table Text Block]
Schedule of reconciliation of liability for claims and claim adjustment expenses.
Schedule of Reconciliation of Liability for Claims and Claim Adjustment Expenses [Table Text Block]
NEW YORK
Variable Rate [Axis]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount
Valuation Allowance
Valuation Allowance
Amount, before effect of policies assumed or ceded, claims paid to policy holders.
Losses, direct
ILLINOIS
us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Less than 12 Months, Accumulated Loss
Diluted (in shares)
Diluted (in shares)
Disclosure of the company's policy regarding revenue recognition, services, commissions, and other income.
Revenue Recognition, Services, Commissions and Other Income [Policy Text Block]
Entity File Number
Deferred Federal, State and Local, Tax Expense (Benefit) [Abstract]
Deferred:
Short-Duration Insurance Contract, Accident Year 2020 [Member]
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total
Accounts payable and other accrued liabilities
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited, shares (in shares)
Federal income tax expense (benefit)
Federal income tax expense
Summary of Valuation Allowance [Table Text Block]
Amount, before effect of policies assumed or ceded, loss adjustment expenses paid to policy holders.
LAE, direct
Revenue Benchmark [Member]
Statutory Accounting Practices, Statutory Net Income Amount
Statutory net income (loss)
Number of Shares Authorized (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)
Number of Operating Segments
Number of operating segment
Segment Reporting Disclosure [Text Block]
Relating to Palomar Specialty Reinsurance Company Bermuda, Ltd.
Palomar Specialty Reinsurance Company Bermuda Ltd [Member]
Deferred Costs [Abstract]
Deferred Policy Acquisition Costs:
Payout percentage, year 6
Short-Duration Insurance Contracts, Historical Claims Duration, Year Six
Standby Letters of Credit [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table]
Catastrophe [Member]
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred intercompany.
Deferred Intercompany
Subsequent Event [Table]
Business Combination, Supplemental Information, Earnings
Derivative assets -- livestock put options
Derivative Assets (Liabilities), at Fair Value, Net
Derivative Assets (Liabilities), at Fair Value, Net, Total
Derivative assets at fair value
Dividend income
Deferred Tax Assets, Other
Other
Current Federal, State and Local, Tax Expense (Benefit) [Abstract]
Current:
Share Repurchase Program, Expiration Date
Share repurchase program, expiration date
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount
Effect of changes in tax laws or rates enacted in the current period
Assumed Premiums Written
Written premiums, assumed
Continental hurricane [Member]
Continental hurricane [Member]
Continental Hurricane [Member]
Represents employee stock purchase plan 2019.
Employee Stock Purchase Plan 2019 [Member]
Property, Plant and Equipment, Useful Life
Property, Plant and Equipment, Useful Life (Year)
New Accounting Pronouncements, Policy [Policy Text Block]
Recent Accounting Pronouncements
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Schedule of Future Minimum Lease Payments [Table Text Block]
Deferred Policy Acquisition Costs [Text Block]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)
Comprehensive Income (Loss) Note [Text Block]
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Total
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Depreciation, Total
Depreciation expense
Short-Duration Insurance Contract, Accident Year 2023 [Member]
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total
Common Stock, Shares, Outstanding (in shares)
Common Stock, Shares, Outstanding (in shares)
Common Stock, Shares, Outstanding, Ending Balance
Common Stock, Shares, Outstanding, Beginning Balance
Depreciation and amortization expense
Depreciation, Depletion and Amortization
Depreciation, Depletion and Amortization, Total
Cybersecurity Risk Management Processes Integrated [Flag]
Document Transition Report
Deferred Tax Assets, Net
Total net deferred tax assets
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items]
Lessee, Operating Leases [Text Block]
Leases [Text Block]
Short-Duration Insurance Contract, Accident Year 2022 [Member]
2025 Award
Two Thousand Twenty Five Award [Member]
Two Thousand Twenty Five Award [Member]
Payments for Repurchase of Common Stock
Repurchase of common stock
Relating to the largest reinsurer three.
Largest Reinsurer Three [Member]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local
State tax net operating losses
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid (Refunded), Prior Years.
plmr_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidRefundedPriorYears
Prior years
Statement of Cash Flows [Abstract]
Cost, Amortization
Current Federal Tax Expense (Benefit)
Federal
Issuance of common stock in stock offering, net of offering costs
Stock Issued During Period, Value, New Issues
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent
Stock-based compensation, percent
us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Acquisitions, net of cash acquired
Equity [Text Block]
Finite-Lived Intangible Assets [Line Items]
Earnings Per Share [Text Block]
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Deferred Tax Liabilities, Other
Other
Other
Computer Equipment [Member]
Computer hardware [Member]
Cybersecurity Risk Management Processes Integrated [Text Block]
Net income
Net income
Outstanding, options, aggregate intrinsic value
us-gaap_DebtAndEquitySecuritiesGainLoss
Net realized and unrealized gains (losses) on investments
Operating Lease, Cost
Operating lease cost
Net unrealized gains on equity securities
Net unrealized gains (losses) on equity securities
Reinsurer, Name [Axis]
Line of Credit Facility [Line Items]
Short-Duration Insurance Contract, Accident Year 2025 [Member]
Hurricane [Member]
Operating Lease, Payments
Operating cash outflows from operating leases
Schedule Of Capital Reserved For Future Issuance [Line Items]
Schedule of capital reserved for future issuance.
Vested and Exercisable, options, aggregate intrinsic value
Assets [Abstract]
Amount, before allocation of valuation allowances and after deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.
plmr_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowance
Net deferred tax asset (liability) before valuation allowance
Income Tax Authority, Name [Axis]
Risk-free interest rate
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Minimum Effective Tax Rate
Percentage of minimum effective tax rate.
Minimum effective tax rate
Increase (Decrease) in Prepaid Expense and Other Assets
Prepaid expenses and other assets
Document Fiscal Year Focus
The net cash outflow or inflow from securities during the period, which are classified as investing activities.
Change in securities receivable or payable, net
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Concentration Risk Benchmark [Domain]
Represents the Laulima Insurance Company.
Laulima Insurance Company [Member]
Investing activities
Retirement Benefits [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
The minimum amount of excess of value of assets over that of liabilities.
plmr_MinimumStatutorySolvencyMargin
Minimum Statutory Solvency Margin
Deferred Federal Income Tax Expense (Benefit)
Federal
Term Loan [Member]
Term loan.
Term Loan
Increase (Decrease) in Unearned Premiums
Unearned premiums
Unrealized Gain (Loss) on Fixed Maturity Securities [Table Text Block]
Deferred tax assets:
Components of Deferred Tax Assets [Abstract]
Fair value portion of cash, cash equivalents and restricted cash.
plmr_CashCashEquivalentsAndRestrictedCashFairValueDisclosure
Cash, cash equivalents, and restricted cash
us-gaap_InterestExpenseLoansFromOtherFederalHomeLoanBanks
Interest Expense, Loans from Other Federal Home Loan Banks
Net investment income
Net Investment Income, Total
Temporary Equity, Interest in Subsidiary Earnings
Eearnings attributable to FIA
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Proceeds from common stock issued via stock option exercises
Share-based compensation arrangement, measurement period
Share Based Compensation Arrangement By Share Based Payment Award Measurement Period
Share based compensation arrangement by share based payment award measurement period.
Fair Value Disclosures [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Dividend Restrictions [Table]
Dividend restrictions.
Effective Income Tax Rate Reconciliation, Tax Credit, Amount
Effective Income Tax Rate Reconciliation, Tax Credit, Amount, Total
Tax credits
Lessee, Operating Lease, Liability, to be Paid, Year One
2026
Represents the market value of trust accounts held.
plmr_TrustParValue
Trust, Par Value
Intangible Asset, Indefinite-Lived [Table]
FLORIDA
Insurance contracts, claims paid and allocated claim adjustment expense
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table]
Amount of policy benefits and loss incurred for policies ceded.
plmr_PolicyholderBenefitsAndLossesIncurredCeded
Losses, ceded
us-gaap_LineOfCredit
Long-Term Line of Credit
Long-Term Line of Credit, Total
Line of credit
Income (Loss) from Subsidiaries, Net of Tax
Income (Loss) from Subsidiaries, Net of Tax, Total
Equity in net income of subsidiaries
Equity in undistributed earnings of subsidiaries
Lessee, Operating Lease, Liability, to be Paid, after Year Five
Thereafter
us-gaap_AssetsFairValueDisclosure
Total assets
The amount of dividends and return on capital available to the company.
plmr_DividendsAndReturnOnCapitalReceivable
Dividends And Return On Capital Receivable
Derivatives, Policy [Policy Text Block]
Proceeds from common stock issued via employee stock purchase plan
Proceeds from common stock issued via equity incentive plans
Concentration Risk, Percentage
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
The amount of commission and other revenue earned during period.
Commission and other income
us-gaap_Revenues
Total revenues
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash used in investing activities
Title of 12(b) Security
us-gaap_InvestmentIncomeNet
Net investment income
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount
Stock-based compensation
Derivative Instruments [Text Block]
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Share Repurchase Program, Remaining Authorized, Amount
Authorized amount available for future repurchases
Options cancelled (in dollars per share)
Forfeited, weighted average grant date fair value (in dollars per share)
Due after one year through five years, Amortized Cost
Due after one year through five years, Amortized Cost
Related and Nonrelated Parties [Domain]
Weighted-average common shares outstanding:
Income Tax Disclosure [Text Block]
Note 16 - Income Taxes
us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
Available-for-Sale, Allowance for Credit Loss
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Beginning Balance
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Total
Debt Securities, Available-for-Sale, Allowance for Credit Loss
Collaborative Arrangement and Arrangement Other than Collaborative [Table]
us-gaap_PaymentsForSoftware
Capitalized software costs
Dividend Restrictions [Line Items]
Dividend restrictions.
Short-Duration Insurance Contract, Cumulative Number of Reported Claims
Insurance contracts, number of claims
Document Information [Table]
Laulima [Member]
Laulima Insurance Exchange [Member]
Laulima Insurance Exchange.
Consolidated Entities [Axis]
Legal Entity [Axis]
Due after one year through five years, Fair Value
Due after one year through five years, Fair Value
Changes in operating assets and liabilities:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Property, Plant and Equipment [Table Text Block]
Letters of Credit Outstanding, Amount
Letter of credit amounts
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Outstanding, options, weighted average exercise price (in dollars per share)
Outstanding, options, weighted average exercise price (in dollars per share)
Deferred Policy Acquisition Costs [Table Text Block]
Income Tax Disclosure [Abstract]
Fair Value, Recurring and Nonrecurring [Table]
Business Combination [Text Block]
Business Acquisitions
Unrecognized Tax Benefits
Unrecognized Tax Benefits, Ending Balance
Unrecognized Tax Benefits, Beginning Balance
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Represents predetermined performance achievement as a percentage.
plmr_PredeterminedPerformanceAchievementPercentage
Predetermined Performance Achievement, Percentage
Measurement Frequency [Domain]
Share Repurchase Program, Authorized, Amount
Share repurchase program, authorized, amount
Trading Symbol
Property, Plant and Equipment Disclosure [Text Block]
Schedule Of Capital Reserved For Future Issuance [Table]
Schedule of capital reserved for future issuance.
Open Tax Year
Debt and Equity Securities, Unrealized Gain (Loss)
Net increase (decrease)
Short-Duration Insurance Contracts, Historical Claims Duration, Year Two
Payout percentage, year 2
Due within one year, Amortized Cost
Due within one year, Amortized Cost
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent, Total
Nontaxable or nondeductible items, percent
Nontaxable or nondeductible items, percent
Subsequent Event Type [Axis]
Short-Duration Insurance Contracts, Accident Year 2017 [Member]
Financing activities
us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage
Fair Value, Recurring [Member]
Lessee, Operating Lease, Liability, to be Paid
Total future minimum lease payments
Represents earthquake premiums.
Earthquake Premiums [Member]
Earthquake
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Less: imputed interest
Less: imputed interest
Short-Duration Insurance Contracts, Claims Development [Table Text Block]
Short-Duration Insurance Contracts, Claims Development [Table Text Block]
Represents Equity Incentive Plan 2019.
Equity Incentive Plan 2019 [Member]
us-gaap_CededPremiumsWritten
Ceded written premiums
Ceded Premiums Written
Ceded premiums written
Deferred Policy Acquisition Costs, Policy [Policy Text Block]
Equity Components [Axis]
Vested and Exercisable, options, weighted average remaining contractual term (Year)
Accounts Payable
Accounts Payable, Total
Payables to subsidiaries
Equity Component [Domain]
Share-Based Payment Arrangement, Activity [Table Text Block]
Increase Decrease In Ceded Unearned Premiums
The increase (decrease) during the reporting period in the amount of ceded unearned premiums.
Ceded unearned premiums
Represents alternate base rate.
Alternate Base Rate [Member]
Goodwill and Intangible Assets Disclosure [Abstract]
Deferred policy acquisition costs, net of ceding commissions and fronting fees
Deferred policy acquisition costs, net of ceding commissions and fronting fees
Balance, beginning of year
Balance, end of year
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Total investments
us-gaap_Investments
Document Annual Report
Business Combination [Axis]
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]
Rule 10b5-1 Arrangement Modified
Rule 10b 51 Arr Modified Flag
Rule 10b 51 Arr Modified Flag.
Due after five years through ten years, Amortized Cost
Due after five years through ten years, Amortized Cost
Short-Duration Insurance Contracts, Historical Claims Duration [Table]
Issuance of common stock via equity incentive plan
Issuance of common stock via equity incentive plan
Issuance of common stock via employee stock purchase plan (in shares)
Issuance of common stock via employee stock purchase plan (in shares)
Customer [Axis]
Subsidiaries [Member]
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)
Statutory Accounting Practice, Jurisdiction [Domain]
Cash Paid To Subsidiaries
Cash paid to subsidiaries.
Cash paid to subsidiaries
us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
Federal Home Loan Bank, Advance, Branch of FHLBank, Amount
Financing Receivable, after Allowance for Credit Loss
Financing Receivable, after Allowance for Credit Loss, Total
Note receivable from subsidiary
The entire disclosure of reserve for losses and loss adjustment expenses.
Reserve for Losses and Loss Adjustment Expenses [Text Block]
Represents the amount of unrealized gain (loss) on other investments during the period.
Net unrealized gains on other investments
Vesting schedule of award under share-based payment arrangement.
Vesting Upon Completion of Requisite Service Period [Member]
Increase (Decrease) in Accrued Investment Income Receivable
Accrued investment income
Represents Hawaii Hurricane.
Hawaii Hurricane [Member]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent
Meals & entertainment, penalties & parking, percent
Amount of deferred policy acquisition cost related to direct commissions.
Direct commissions
Maximum [Member]
Impairment of Intangible Assets (Excluding Goodwill)
Impairment of Intangible Assets (Excluding Goodwill), Total
Represents PSIC.
PSIC [Member]
Statistical Measurement [Axis]
Options exercised, options, weighted average exercise price (in dollars per share)
us-gaap_PremiumsWrittenNet
Net written premiums
Amount of policy benefits and loss adjustment expenses incurred for policies assumed.
LAE, assumed
Finite-Lived Intangible Assets, Accumulated Amortization
Accumulated amortization on finite-lived intangibles
Accumulated amortization on finite-lived intangibles
Common stock, $0.0001 par value, 500,000,000 shares authorized, 26,529,402 and 24,772,987 shares issued and outstanding as of December 31, 2025 and December 31, 2024, respectively
Common stock, $0.0001 par value, 500,000,000 shares authorized, 26,520,417 and 26,529,402 shares issued and outstanding as of December 31, 2025 and December 31, 2024, respectively
Common stock, $0.0001 par value, 500,000,000 shares authorized, 26,520,417 and 26,529,402 shares issued and outstanding as of December 31, 2025 and December 31, 2024, respectively
Line of Credit Facility, Expiration Date
Line of Credit Facility, Maturity Date
Direct Premiums Written
Written premiums, direct
Variable Interest Entity, Measure of Activity, Income or Loss before Tax
Allowance for uncollectible premiums
Premium Receivable, Allowance for Credit Loss
Premium Receivable, Allowance for Credit Loss, Ending Balance
Premium Receivable, Allowance for Credit Loss, Beginning Balance
Represents securities on deposit with state regulatory authorities.
Securities on Deposit With State Regulatory Authorities [Member]
Secured Overnight Financing Rate (SOFR) [Member]
Maximum Capacity to Pay Dividend
Maximum capacity to pay dividend.
Maximum capacity to pay dividend
Gains on sales of fixed maturity securities
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]
Increase (Decrease) in Deferred Policy Acquisition Costs
Deferred policy acquisition costs
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Net unrealized gains (losses) on securities available for sale
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent, Total
Net unrealized losses on securities available for sale
Premiums receivable
Premiums receivable
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent
State and local income tax, net of federal (national) income tax effect, percent
us-gaap_BenefitsLossesAndExpenses
Total expenses
Other operating expenses
Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and losses incurred.
Losses, net
Losses, net
Current year
Entity Public Float
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Volatility
Preferred Stock, Shares Authorized (in shares)
Preferred Stock, Shares Authorized (in shares)
Finite-Lived Intangible Assets by Major Class [Axis]
us-gaap_PremiumsEarnedNet
Net earned premiums
Statutory Accounting Practices Disclosure [Table Text Block]
Lender Name [Axis]
us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss
Accumulated Loss
Short-Duration Insurance Contract, Accident Year 2019 [Member]
Accounts payable and other accrued liabilities
Accounts payable and other accrued liabilities
Accounts payable and other liabilities
Effect of cross-border tax laws, percent
Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent
Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent, Total
Employee Stock [Member]
Business Combination [Table]
Entity Registrant Name
Debt Disclosure [Text Block]
us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Available-for-sale, Accumulated Gross Unrealized Loss
Entity Voluntary Filers
us-gaap_TreasuryStockSharesAcquired
Treasury Stock, Shares, Acquired (in shares)
Insurance contracts, claim expense
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net
us-gaap_AdditionalPaidInCapital
Additional Paid in Capital
Additional Paid in Capital, Total
Accumulated Other Comprehensive Income (Loss) [Table]
State
Deferred State and Local Income Tax Expense (Benefit)
us-gaap_EquitySecuritiesFvNiRealizedLoss
Losses on sales of equity securities
Subsequent Events [Abstract]
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Liability for Claims and Claims Adjustment Expense [Line Items]
Amount of deferred tax liability attributable to taxable temporary differences from deferred acquisition costs.
plmr_DeferredTaxLiabilitiesDeferredAcquisitionCosts
Deferred acquisition costs
Deferred acquisition costs
The tabular disclosure of common stock reserved for future issuance.
Schedule of Capital Reserved for Future Issuance [Table Text Block]
Cybersecurity Risk Management Positions or Committees Responsible [Flag]
Consolidated Entities [Domain]
Income tax expense
Income tax benefit
Income tax expense
Measurement Frequency [Axis]
Other investments
Other investments
Relating to largest reinsurer one.
Largest Reinsurer One [Member]
Stock Repurchased During Period, Value
Treasury Stock, Value, Acquired, Cost Method
Proceeds from Issuance of Common Stock
Proceeds from stock offering, net of offering costs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Investment Income [Table Text Block]
Capitalized Computer Software, Accumulated Amortization
Capitalized Software, accumulated amortization
Entity Common Stock, Shares Outstanding
Statutory Accounting Practices, Statutory Capital and Surplus, Balance
Statutory capital and surplus
Concentration Risk, Credit Risk, Policy [Policy Text Block]
US States and Political Subdivisions Debt Securities [Member]
US States and Political Subdivisions Debt Securities [Member]
Payout percentage, year 8
Short-Duration Insurance Contracts, Historical Claims Duration, Year Eight
Amount in which expected losses and loss adjustment expenses, unamortized acquisition costs, and policy maintenance costs exceeds the remaining unearned premiums.
plmr_PremiumDeficiency
Premium Deficiency
Short-Duration Insurance Contracts, Accident Year 2018 [Member]
Accumulated other comprehensive loss
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total
Represents casualty.
Casualty [Member]
Casualty
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of property and equipment
Net realized and unrealized (gains) losses on investments
Gain (Loss) on Investments, Total
Net realized and unrealized gains (losses) on investments
Net realized and unrealized gains on investments
Net realized and unrealized gains on investments
Granted, shares (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)
Total assets
Assets
Property, Plant and Equipment [Table]
Cash paid for state income taxes
Income Tax Paid, State and Local, after Refund Received
State
Income Tax Paid, State and Local, after Refund Received, Total
Income Statement [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation
Deferred compensation
Fair Value of Financial Instruments, Policy [Policy Text Block]
Jon Christianson [Member]
Jon Christianson.
Share-Based Payment Arrangement [Policy Text Block]
Total Deferred
Deferred income tax expense (benefit)
Deferred Income Tax Expense (Benefit)
Deferred
Statutory Accounting Practice, Jurisdiction [Axis]
Unearned premiums
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve
Issuance of common stock in stock offering, net of offering costs (in shares)
Stock Issued During Period, Shares, New Issues
Lease, Cost [Abstract]
Reinsurance Recoverable Including Reinsurance Premium Paid [Member]
Unearned premiums
Unearned Premiums
Statutory Accounting Practices [Table]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Released, shares (in shares)
Consolidation, Variable Interest Entity, Policy [Policy Text Block]
Per Share Data:
Business Combination [Abstract]
Diluted earnings per share (in dollars per share)
Diluted (in dollars per share)
Net Proceeds From Purchases Of Derivative Contracts
Net Proceeds From Purchases Of Derivative Contracts.
Net proceeds from (purchases of) derivative contracts
Title and Position [Domain]
Disaggregation of Revenue [Abstract]
Mortgage and asset-backed securities, Fair Value
Mortgage and asset-backed securities, Fair Value
City Area Code
Increase (Decrease) in Funds Held under Reinsurance Agreements
Funds held under reinsurance treaty
Advanced AgProtection, LLC [Member]
Advanced AgProtection, LLC [Member]
Business Combination, Pro Forma Information, Pro Forma Revenue
Business Combination, Supplemental Pro Forma, Revenue
Losses and LAE, ceded
Policyholder Benefits and Claims Incurred, Ceded
Auditor Name
Proceeds from Line of Credit
Proceeds from Lines of Credit
Proceeds from Lines of Credit, Total
The entire disclosure regarding dividend restrictions.
Dividend Restriction Disclosure [Text Block]
Debt Instrument, Face Amount
Represents number of stock price milestones achieved.
plmr_NumberOfStockPriceMilestonesAchieved
Number of Stock Price Milestones Achieved
Schedule of Intangible Assets and Goodwill [Table Text Block]
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Maximum Borrowing Capacity
Business Combination [Line Items]
Variable Interest Entity, Not Primary Beneficiary [Member]
Counterparty Name [Domain]
Insurance [Abstract]
Issuance of common stock via employee stock purchase plan
Issuance of common stock via employee stock purchase plan
Operating Lease, Weighted Average Remaining Lease Term
Weighted-average remaining lease term on operating leases (years)
Short-Duration Insurance Contracts, Historical Claims Duration, Year Three
Payout percentage, year 3
Revenue since Acquisition
Business Combination, Acquiree's Revenue since Acquisition Date, Actual
Award Date [Axis]
Investments:
Cash and Cash Equivalents, Policy [Policy Text Block]
Stock-based compensation
Stock-based compensation
Maximum Dividend Percentage
Maximum dividend percentage.
Property and equipment, net
Property and equipment, net
Property and equipment, net
Gray Casualty & Surety Company
Gray Casualty And Surety Company [Member]
Gray Casualty And Surety Company.
Vested and Exercisable, options (in shares)
Prior years
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash, cash equivalents and restricted cash at end of period
Cash, cash equivalents and restricted cash at beginning of period
Cash and cash equivalents and restricted cash
Represents maximum authorized annual increase of shares under share-based compensation arrangement for shares available for grant.
plmr_SharebasedCompensationArrangementBySharebasedPaymentAwardSharesAvailableForIssuanceAuthorizedAnnualIncreaseMaximum
Share-based Compensation Arrangement by Share-based Payment Award, Shares Available for Issuance, Authorized Annual Increase, Maximum (in shares)
Award Date [Domain]
Retained Earnings [Member]
Retained Earnings [Member]
Share-Based Payment Arrangement, Noncash Expense
Share-Based Payment Arrangement, Noncash Expense, Total
Stock-based compensation expense
SEC Schedule, 12-09, Allowance, Uncollectible Premium Receivable [Member]
Relating to the largest program administrator.
Largest Program Administrator [Member]
Less than 12 Months, fair value
Less than 12 Months, fair value
Operating Lease, Weighted Average Discount Rate, Percent
Weighted-average discount rate on operating leases
Fair Value, Inputs, Level 1 [Member]
Disclosure Text Block [Abstract]
Notes to Financial Statements
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by (used in) financing activities
Notes Payable
Notes Payable, Total
Borrowings from credit agreements
Represents other comprehensive income (loss) from investments arising during the period.
Equity in other comprehensive income (loss) of subsidiaries, net of taxes
Short-Duration Insurance Contracts, Schedule of Historical Claims Duration [Table Text Block]
Short-Duration Insurance Contracts, Schedule of Historical Claims Duration [Table Text Block]
Lease, Cost [Table Text Block]
Schedule of Supplementary Lease Information [Table Text Block]
Reinsurer Concentration Risk [Member]
Short-Duration Insurance Contract, Accident Year 2024 [Member]
Auditor Location
Deferred Tax Assets, Net, Before Valuation Allowance
Deferred Tax Assets, Net, Before Valuation Allowance
Net deferred tax asset before valuation allowance
Changes in operating assets and liabilities:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item, Total
Due after five years through ten years, Fair Value
Due after five years through ten years, Fair Value
Reinsurer, Name [Domain]
Condensed Cash Flow Statement [Table Text Block]
Deferred Policy Acquisition Cost, Capitalization
Total net additions
Income Tax Jurisdiction [Domain]
Debt Securities, Available-for-Sale [Table]
Entity Interactive Data Current
Represents U.S. hurricane.
U.S. Hurricane [Member]
Investments in limited partnerships
us-gaap_PaymentsForAdvanceToAffiliate
Operating activities
Catastrophic Event [Domain]
Represents the amount of income from continuing operations, net of tax before income from subsidiaries.
plmr_IncomeLossFromContinuingOperationsNetOfTaxAttributableToParentBeforeIncomeLossFromSubsidiaries
Loss before equity in net income of subsidiaries
Deferred tax liabilities:
Components of Deferred Tax Liabilities [Abstract]
Ceded Written Premiums Under Fronting And Quota Share Arrangements [Member]
Ceded written premiums under fronting and quota share arrangements.
Ceded Written Premiums Under Fronting and Quota Share Arrangements [Member]
Represents crops.
Crop [Member]
Crop
Option Indexed to Issuer's Equity, Type [Domain]
Entity Tax Identification Number
Income Tax Authority, Name [Domain]
Local Phone Number
Represents the amount of current assets divided by the amount of current liabilities in a percentage.
plmr_LiquidityRatio
Liquidity Ratio
Accumulated Other Comprehensive Income (Loss) [Line Items]
Auditor Opinion [Text Block]
us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Offering costs (related to prior year offering)
Accounting Policies [Abstract]
Significant Accounting Policies
Amount of income (expenses) related to the generation of investment income.
plmr_InvestmentIncomeInvestmentIncomeExpense
Investment income (expense)
Investment expense
Disaggregation of Revenue [Line Items]
Lessee, Operating Lease, Liability, to be Paid, Year Four
2029
Reinsurance Recoverable, Allowance for Credit Loss
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance
Reinsurance Recoverable, Allowance for Credit Loss, Total
Reserve for losses and loss adjustment expense, net of reinsurance
The amount of maximum dividend or distribution that may be made without the prior approval of the Arizona Insurance Commissioner.
plmr_ThresholdDividendOrDistributionWithoutApprovalOfArizonaInsuranceCommissioner
Threshold Dividend or Distribution without Approval of Arizona Insurance Commissioner
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)
Office Equipment [Member]
Equipment and furniture [Member]
Cash, Cash Equivalents, and Short-Term Investments
Cash, Cash Equivalents, and Short-Term Investments, Total
Represents Palomar Excess And Surplus Insurance Company.
Palomar Excess And Surplus Insurance Company [Member]
Entity Emerging Growth Company
Note 15 - Underwriting Information