Document And Entity Information Due after ten years, Fair Value Note To Financial Statement Details Textual Significant Accounting Policies Note 2 - Investments Due within one year, Amortized Cost Note 3 - Fair Value Measurements Net unrealized gains (losses) on securities available for sale Note 4 - Reserve for Losses and Loss Adjustment Expenses Due within one year, Fair Value Note 5 - Stockholders' Equity Due after one year through five years, Fair Value Note 6 - Accumulated Other Comprehensive Income Due after five years through ten years, Fair Value Note 7 - Underwriting Information Note 9 - Earnings Per Share Note 2 - Investments - Summary of Available for Sale Investments (Details) Income Tax Disclosure [Text Block] Note 2 - Investments - Security Holdings in an Unrealized Loss Position (Details) Note 2 - Investments - The Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details) Note 2 - Investments - Summary of Net Investment Income (Details) Note 2 - Investments - Net Realized and Unrealized Investment Gains and Losses (Details) Note 3 - Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) Note 4 - Reserve for Losses and Loss Adjustment Expenses - Reconciliation of Changes in Reserve Balance for Losses and Loss Adjustment Expenses (Details) Note 5 - Stockholders' Equity - Common Stock Reserved for Future Issuance (Details) Note 5 - Stockholders' Equity - Schedule of Stock-based Compensation (Details) Note 5 - Stockholders' Equity - Summary of Stock Option Activity (Details) Asset-Backed Securities [Member] Note 5 - Stockholders' Equity - Summary of RSU Transactions (Details) Note 5 - Stockholders' Equity - Summary of PSU Transactions (Details) Note 6 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss) (Details) Note 7 - Underwriting Information - Schedule of Gross Written Premiums (Details) Note 9 - Earnings Per Share - Earnings Per Share of Common Stock (Details) US States and Political Subdivisions Debt Securities [Member] Notes To Financial Statements Notes To Financial Statements [Abstract] Share-Based Payment Arrangement, Activity [Table Text Block] Granted, weighted average grant date fair value (in dollars per share) us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss 12 Months or Longer, Accumulated Loss us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Accumulated Loss Released, weighted average grant date fair value (in dollars per share) Sales of equity securities Forfeited, weighted average grant date fair value (in dollars per share) 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) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod Forfeited, shares (in shares) Sales and maturities of fixed maturity securities Equity Instruments Other than Options, Nonvested, Number (in shares) Non-vested, shares (in shares) Non-vested, shares (in shares) us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss Less than 12 Months, Accumulated Loss us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt Proceeds from Sale of Debt Securities, Available-for-Sale Vested and Exercisable, options, weighted average remaining contractual term (Year) us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent Other comprehensive income (loss) before reclassification, net of tax us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent Amounts reclassified from AOCI, net of tax US Government Agencies Debt Securities [Member] Granted, shares (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod Released, shares (in shares) Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Schedule of Nonvested Performance-Based Units Activity [Table Text Block] Vested and Exercisable, options (in shares) Vested and Exercisable, options, weighted average exercise price (in dollars per share) Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Vested and Exercisable, options, aggregate intrinsic value Other comprehensive income, net: us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions plmr_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidRefundedPriorYears Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid (Refunded), Prior Years. Fair value Debt Securities, Available-for-Sale, Unrealized Loss Position us-gaap_PaymentsForAdvanceToAffiliate Investments in limited partnerships Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Outstanding, options, weighted average remaining contractual term (Year) Outstanding, options, aggregate intrinsic value Less than 12 Months, fair value 12 Months or Longer, fair value Equity securities Equity securities, at fair value (cost: $44,462 in 2025; $32,987 in 2024) us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt Purchases of fixed maturity securities us-gaap_PaymentsToAcquireMarketableSecurities Purchases of equity securities Financial Instruments [Domain] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice Outstanding, options, weighted average exercise price (in dollars per share) Outstanding, options, weighted average exercise price (in dollars per share) Options cancelled (in dollars per share) Financial Instrument [Axis] Options exercised, options, weighted average exercise price (in dollars per share) Mortgage and asset-backed securities, Fair Value Mortgage and asset-backed securities, Amortized Cost Revolving Credit Facility [Member] Options, Outstanding, Number (in shares) Outstanding, options (in shares) Outstanding, options (in shares) Credit Facility [Axis] Credit Facility [Domain] us-gaap_PolicyTextBlockAbstract Accounting Policies Gains on sales of fixed maturity securities us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss Losses on sales of fixed maturity securities us-gaap_PaymentsForSoftware Capitalized software costs us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchases of property and equipment us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) Number of Shares Authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) Cash paid for income taxes Net unrealized (losses) gains on equity securities us-gaap_DebtAndEquitySecuritiesGainLoss Net realized and unrealized (losses) gains on investments us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Liabilities: Vesting [Axis] Vesting [Domain] Share-Based Payment Arrangement, Tranche One [Member] Share-Based Payment Arrangement, Tranche Two [Member] Supplementary cash flow information: us-gaap_Assets Total assets plmr_LossAndLossAdjustmentExpenseReserveRedundancy Loss and Loss Adjustment Expense Reserve Redundancy Represents the amount of loss and loss adjustment expense reserve redundancy. Plan Name [Axis] Plan Name [Domain] us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) Deferred tax assets, net Prepaid expenses and other assets Award Type [Domain] Basis of Presentation and Significant Accounting Policies [Text Block] Award Type [Axis] Net income Net income Restricted Stock Units (RSUs) [Member] Performance Shares [Member] Share-Based Payment Arrangement, Option [Member] Business Combination [Text Block] us-gaap_ProceedsFromSaleOfEquitySecuritiesFvNi Proceeds from Sale of Equity Securities, FV-NI Property and equipment, net us-gaap_Investments Total investments Investing activities Debt Securities, Available-for-sale Fixed maturity securities available for sale, at fair value (amortized cost: $1,015,892 in 2025; $973,330 in 2024) Debt Securities, Available-for-Sale Total, Fair Value Laulima Insurance Company [Member] Represents the Laulima Insurance Company. Earnings Per Share [Text Block] Other investments Investment Income [Table Text Block] Crop [Member] Represents crops. Inland Marine and Other Property [Member] Represents inland marine and other properties. Equity method investment Earthquake Premiums [Member] Represents earthquake premiums. Income tax expense Gain (Loss) on Securities [Table Text Block] Funds held under reinsurance treaty Net realized and unrealized (losses) gains on investments Investments: Restricted cash Restricted cash Cash and cash equivalents Stock-Based Compensation Reinsurance [Text Block] Acquisition expenses, net of ceding commissions and fronting fees Amendment Flag us-gaap_ComprehensiveIncomeNetOfTax Net comprehensive income City Area Code Use of Estimates, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_TreasuryStockSharesAcquired Treasury Stock, Shares, Acquired (in shares) us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) Common Stock, Shares, Outstanding (in shares) Common Stock, Shares, Outstanding (in shares) Preferred Stock, Shares Outstanding (in shares) Preferred Stock, Shares Outstanding (in shares) Current Fiscal Year End Date us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate Net realized investment losses Document Fiscal Period Focus Accrued investment income Document Fiscal Year Focus Premiums receivable Document Period End Date Entity File Number Entity Emerging Growth Company Document Type Entity Small Business Entity Shell Company Document Information [Line Items] Document Information [Table] Entity Filer Category Entity Current Reporting Status Deferred policy acquisition costs, net of ceding commissions and fronting fees Variable Rate [Domain] Variable Rate [Axis] Stock-based compensation Entity Tax Identification Number Entity Central Index Key Entity Registrant Name Gains on sales of equity securities us-gaap_EquitySecuritiesFvNiRealizedLoss Losses on sales of equity securities Entity [Domain] Legal Entity [Axis] us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Entity Address, Address Line One us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts Offering Costs (related to prior year offering) ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Entity Address, City or Town ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Entity Address, Postal Zip Code Entity Address, State or Province ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Material Terms of Trading Arrangement [Text Block] Entity Common Stock, Shares Outstanding Trading Arrangements, by Individual [Table] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Trading Symbol plmr_ProceedsFromPolicyholdersContributionToSurplus Policy holder contribution to surplus Amount of cash inflow from policyholders contribution to surplus. Policyholder contribution to surplus Amount of increase (decrease) in additional paid in capital (APIC) resulting from policyholder contribution to surplus. Issuance of common stock via employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) Local Phone Number us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised Options exercised, options (in shares) us-gaap_TableTextBlock Notes Tables Issuance of common stock via employee stock purchase plan us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Issuance of common stock via equity incentive plan (in shares) Issuance of common stock via equity incentive plan Secured Overnight Financing Rate (SOFR) [Member] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod Options cancelled (in shares) us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders' equity Retained earnings Accumulated other comprehensive loss Debt Disclosure [Text Block] Interest expense us-gaap_InterestExpenseDebt Interest Expense, Debt us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch Federal Home Loan Bank, Advance, Branch of FHLBank, Amount us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Goodwill and intangible assets, net Segment Reporting, Policy [Policy Text Block] us-gaap_Revenues Total revenues Other underwriting expenses us-gaap_AssetsFairValueDisclosure Total assets Equity Securities, Cost Equity [Text Block] Common stock, $0.0001 par value, 500,000,000 shares authorized, 26,735,132 and 26,529,402 shares issued and outstanding as of March 31, 2025 and December 31, 2024, respectively Measurement Frequency [Axis] Measurement Frequency [Domain] Fair Value, Recurring [Member] Common Stock, Shares Authorized (in shares) Common Stock, Shares Authorized (in shares) Common Stock, Shares, Issued (in shares) Common Stock, Shares, Issued (in shares) Common Stock, Par Value (in dollars per share) Common Stock, Par or Stated Value Per Share (in dollars per share) us-gaap_CommonStockCapitalSharesReservedForFutureIssuance Total (in shares) Statistical Measurement [Domain] Maximum [Member] Minimum [Member] Product and Service [Axis] Product and Service [Domain] Statistical Measurement [Axis] us-gaap_PaymentsForLossesAndLossAdjustmentExpense Total payments Preferred stock, $0.0001 par value, 5,000,000 shares authorized, 0 shares issued and outstanding as of March 31, 2025 and December 31, 2024 Preferred Stock, Shares Issued (in shares) Preferred Stock, Shares Issued (in shares) Cash paid for interest Geographical [Axis] Geographical [Domain] Preferred Stock, Shares Authorized (in shares) Preferred Stock, Shares Authorized (in shares) us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments CALIFORNIA us-gaap_PremiumsEarnedNet Net earned premiums COLORADO Preferred Stock, Par Value (in dollars per share) Preferred Stock, Par or Stated Value Per Share (in dollars per share) FLORIDA Fair Value, Inputs, Level 3 [Member] HAWAII Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value Hierarchy and NAV [Axis] Catastrophic Event [Domain] Hurricane [Member] Earthquake [Member] NEW MEXICO NEW YORK Catastrophic Event [Axis] Operating activities Net investment income us-gaap_CededPremiumsWritten Ceded written premiums us-gaap_PremiumsWrittenNet Net written premiums Employee Stock [Member] Change in unearned premiums Statement [Line Items] TEXAS Gross written premiums us-gaap_AdditionalPaidInCapital Additional Paid in Capital Add: Reinsurance recoverables on unpaid losses and LAE at end of period Reinsurance recoverable on unpaid losses and loss adjustment expenses WASHINGTON Ceded unearned premiums Net unrealized losses on equity method investment 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). AOCI Attributable to Parent [Member] Reinsurance recoverable on paid losses and loss adjustment expenses Additional paid-in capital Stockholders' equity: Ceded premium payable Segment Reporting Disclosure [Text Block] us-gaap_InvestmentIncomeNet Net investment income Fair Value Disclosures [Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash and cash equivalents and restricted cash Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Interest income us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase in cash, cash equivalents and restricted cash Dividend income us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by (used in) financing activities us-gaap_Liabilities Total liabilities Net cash provided by operating activities us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities Losses and loss adjustment expenses us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 Current year Current year Prior years us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 Total incurred Add: Balance acquired from FIA(1) Consolidated Entities [Axis] Consolidated Entities [Domain] us-gaap_PaymentsOfStockIssuanceCosts Offering costs (related to prior year offering) Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Commission and other income The amount of commission and other revenue earned during period. Accounts payable and other accrued liabilities Securities on Deposit With State Regulatory Authorities [Member] Represents securities on deposit with state regulatory authorities. Change in securities receivable or payable, net The net cash outflow or inflow from securities during the period, which are classified as investing activities. plmr_DebtAndEquitySecuritiesRealizedGain Total realized gains Amount of realized gain on investment in debt and equity securities. Cash, cash equivalents, and restricted cash plmr_CashCashEquivalentsAndRestrictedCashFairValueDisclosure Fair value portion of cash, cash equivalents and restricted cash. plmr_DebtAndEquitySecuritiesRealizedLoss Total realized losses Amount of realized loss on investment in debt and equity securities. Special Revenue Excluding Asset Backed Securities [Member] Represents special revenue excluding asset backed securities. Corporate Debt Securities and Other Debt Obligations [Member] Represents corporate debt securities and other debt obligations. Reserve for Losses and Loss Adjustment Expenses [Text Block] The entire disclosure of reserve for losses and loss adjustment expenses. Retained Earnings [Member] plmr_ReinsurancePolicyExcessOfLossProtectionAmount Reinsurance Policy, Excess of Loss Protection Amount Excess of loss protection amount of reinsurance policy. Proceeds from common stock issued via stock option exercises Investment expense plmr_InvestmentIncomeInvestmentIncomeExpense Amount of income (expenses) related to the generation of investment income. Net unrealized gains on other investments Represents the amount of unrealized gain (loss) on other investments during the period. us-gaap_BenefitsLossesAndExpenses Total expenses Alternate Base Rate [Member] Represents alternate base rate. Additional Paid-in Capital [Member] Hawaii Hurricane [Member] Represents Hawaii Hurricane. Common Stock [Member] plmr_CatastropheBondFaceValue Catastrophe Bond, Face Value Fair value amount of catastrophe bond. U.S. Hurricane [Member] Represents U.S. hurricane. Proceeds from common stock issued via employee stock purchase plan Equity Components [Axis] Equity Component [Domain] plmr_FederalHomeLoanBankAdvancesGeneralDebtObligationsMaximumAmountAvailableAsPercentageOfStatutoryAdmittedAssets Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available as Percentage of Statutory Admitted Assets Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB) as percentage of statutory admitted assets, Federal income tax benefit Expenses: us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Income before income taxes Casualty [Member] Represents casualty. us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax Federal income tax (benefit) expense Fronting Premium [Member] Represents fronting premium. Palomar Excess And Surplus Insurance Company [Member] Represents Palomar Excess And Surplus Insurance Company. Equity Incentive Plan 2019 [Member] Represents Equity Incentive Plan 2019. Comprehensive Income (Loss) Note [Text Block] us-gaap_LineOfCredit Long-Term Line of Credit Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Percentage of Gross Written Premiums Represents percentage of gross written premiums. Palomar Specialty Insurance Company [Member] Represents Palomar Specialty Insurance Company. Other States [Member] Represents other states. plmr_NumberOfStockPriceMilestonesAchieved Number of Stock Price Milestones Achieved Represents number of stock price milestones achieved. plmr_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardServicePeriod Share-based Compensation Arrangement by Share-based Payment Award, Award Service Period (Year) Duration of award service period under share-based compensation arrangement. plmr_SharebasedCompensationArrangementBySharebasedPaymentAwardSharesAvailableForIssuanceAuthorizedAnnualIncreaseMaximum Share-based Compensation Arrangement by Share-based Payment Award, Shares Available for Issuance, Authorized Annual Increase, Maximum (in shares) Represents maximum authorized annual increase of shares under share-based compensation arrangement for shares available for grant. plmr_PredeterminedPerformanceAchievementPercentage Predetermined Performance Achievement, Percentage Represents predetermined performance achievement as a percentage. Share Based Payment Arrangement Tranche One First Anniversary [Member] Represents vesting on first anniversary. plmr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageNumberOfAdditionalSharesAvailableForGrant Share Based Compensation Arrangement By Share Based Payment Award Percentage, Number of Additional Shares Available for Grant 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_NumberOfDaysAchievementOfMilestoneStockPrice Number of Days, Achievement of Milestone Stock Price Represents number of dates for achievement of milestone stock price. Disaggregation of Revenue [Table Text Block] Employee Stock Purchase Plan 2019 [Member] Represents employee stock purchase plan 2019. Schedule of Capital Reserved for Future Issuance [Table Text Block] The tabular disclosure of common stock reserved for future issuance. First Indemnity of America Insurance Company [Member] 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. Document Quarterly Report Entity Incorporation, State or Country Code Accounting Policies [Abstract] Document Transition Report Basis of Accounting, Policy [Policy Text Block] Entity Interactive Data Current Security Exchange Name Title of 12(b) Security Common Share equivalents (in shares) Diluted (in shares) Diluted (in shares) Unearned premiums Reserve for losses and LAE gross of reinsurance recoverables on unpaid losses and LAE at end of period Statement [Table] Statement of Financial Position [Abstract] us-gaap_ReinsuranceRetentionAmountRetainedPerEvent Reinsurance, Amount Retained, Per Event Diluted (in dollars per share) Basic (in shares) Per Share Data: us-gaap_EffectiveIncomeTaxRateContinuingOperations Effective Income Tax Rate Reconciliation, Percent us-gaap_InterestExpenseLoansFromOtherFederalHomeLoanBanks Interest Expense, Loans from Other Federal Home Loan Banks Basic (in dollars per share) Net (payments on) proceeds from line of credit Weighted-average common shares outstanding: us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss Available-for-Sale, Allowance for Credit Loss Statement of Cash Flows [Abstract] Statement of Stockholders' Equity [Abstract] Other comprehensive income (loss), net of tax Other comprehensive income (loss) Income Statement [Abstract] Change in allowance for credit losses us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet Reserve for losses and LAE net of reinsurance recoverables at beginning of period Reserve for losses and LAE net of reinsurance recoverables at end of period Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Financing activities us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Other comprehensive income (loss) before reclassification us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent Amounts reclassified from AOCI us-gaap_StockholdersEquity Total stockholders' equity Balance Balance us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired Acquisitions, net of cash acquired Class of Stock [Axis] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax Available-for-sale, Accumulated Gross Unrealized Loss Available-for-sale, Accumulated Gross Unrealized Gain Available-for-Sale, Amortized Cost Amortized Cost Due after one year through five years, Amortized Cost Due after five years through ten years, Amortized Cost Due after ten years, Amortized Cost