75000 - Document - Document And Entity Information
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75010 - Statement - Condensed Consolidated Balance Sheets (Unaudited)
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75020 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)
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75030 - Statement - Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited)
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75040 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited)
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75050 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)
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995455 - Disclosure - Note 1 - Summary of Operations and Basis of Presentation
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995465 - Disclosure - Note 2 - Investments
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995475 - Disclosure - Note 3 - Derivative Instruments
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995485 - Disclosure - Note 4 - Fair Value Measurements
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995495 - Disclosure - Note 5 - Goodwill and Intangible Assets
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995505 - Disclosure - Note 6 - Reserve for Losses and Loss Adjustment Expenses
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995515 - Disclosure - Note 7 - Stockholders' Equity
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995525 - Disclosure - Note 8 - Accumulated Other Comprehensive Income
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995535 - Disclosure - Note 9 - Underwriting Information
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995545 - Disclosure - Note 10 - Income Taxes
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995555 - Disclosure - Note 11 - Earnings Per Share
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995565 - Disclosure - Note 11 - Reinsurance
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995575 - Disclosure - Note 13 - Credit Agreements
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995585 - Disclosure - Note 14 - Business Acquisitions
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995595 - Disclosure - Note 15 - Subsequent Events
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995605 - Disclosure - Significant Accounting Policies (Policies)
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995615 - Disclosure - Note 2 - Investments (Tables)
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995625 - Disclosure - Note 4 - Fair Value Measurements (Tables)
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995635 - Disclosure - Note 5 - Goodwill and Intangible Assets (Tables)
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995645 - Disclosure - Note 6 - Reserve for Losses and Loss Adjustment Expenses (Tables)
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995655 - Disclosure - Note 7 - Stockholders' Equity (Tables)
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995665 - Disclosure - Note 8 - Accumulated Other Comprehensive Income (Tables)
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995675 - Disclosure - Note 9 - Underwriting Information (Tables)
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995685 - Disclosure - Note 11 - Earnings Per Share (Tables)
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995695 - Disclosure - Note 14 - Business Acquisitions (Tables)
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995705 - Disclosure - Note 1 - Summary of Operations and Basis of Presentation (Details Textual)
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995715 - Disclosure - Note 2 - Investments (Details Textual)
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995725 - Disclosure - Note 2 - Investments - Summary of Available for Sale Investments (Details)
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995735 - Disclosure - Note 2 - Investments - Security Holdings in an Unrealized Loss Position (Details)
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995745 - Disclosure - Note 2 - Investments - The Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details)
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995755 - Disclosure - Note 2 - Investments - Summary of Net Investment Income (Details)
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995765 - Disclosure - Note 2 - Investments - Net Realized and Unrealized Investment Gains and Losses (Details)
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995775 - Disclosure - Note 3 - Derivative Instruments (Details Textual)
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995785 - Disclosure - Note 4 - Fair Value Measurements (Details Textual)
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995795 - Disclosure - Note 4 - Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)
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995805 - Disclosure - Note 5 - Goodwill and Intangible Assets (Details Textual)
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995815 - Disclosure - Note 5 - Goodwill and Intangible Assets - Reconciliation of Changes in the Ending Balance of Each Major Intangible Asset Class (Details)
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995825 - Disclosure - Note 5 - Goodwill and Intangible Assets - Information of Each Major Intangible Asset Class Subject to Amortization (Details)
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995835 - Disclosure - Note 5 - Goodwill and Intangible Assets - Estimated Future Amortization Expense to be Reported for the Next Five Years (Details)
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995845 - Disclosure - Note 6 - Reserve for Losses and Loss Adjustment Expenses (Details Textual)
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995855 - Disclosure - Note 6 - Reserve for Losses and Loss Adjustment Expenses - Reconciliation of Changes in Reserve Balance for Losses and Loss Adjustment Expenses (Details)
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995865 - Disclosure - Note 6 - Reserve for Losses and Loss Adjustment Expenses - Reconciliation of Changes in Reserve Balance for Losses and Loss Adjustment Expenses (Parentheticals) (Details)
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995875 - Disclosure - Note 7 - Stockholders' Equity (Details Textual)
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995885 - Disclosure - Note 7 - Stockholders' Equity - Common Stock Reserved for Future Issuance (Details)
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995895 - Disclosure - Note 7 - Stockholders' Equity - Schedule of Stock-based Compensation (Details)
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995905 - Disclosure - Note 7 - Stockholders' Equity - Summary of Stock Option Activity (Details)
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995915 - Disclosure - Note 7 - Stockholders' Equity - Summary of RSU Transactions (Details)
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995925 - Disclosure - Note 7 - Stockholders' Equity - Summary of Key Valuation Input Assumptions Used in Monte Carlo Simulation Relative to Awards Granted (Details)
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995935 - Disclosure - Note 7 - Stockholders' Equity - Summary of PSU Transactions (Details)
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995945 - Disclosure - Note 8 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss) (Details)
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995955 - Disclosure - Note 8 - Accumulated Other Comprehensive Income (Details Textual)
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995965 - Disclosure - Note 9 - Underwriting Information - Schedule of Gross Written Premiums (Details)
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995975 - Disclosure - Note 10 - Income Taxes (Details Textual)
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995985 - Disclosure - Note 11 - Earnings Per Share - Earnings Per Share of Common Stock (Details)
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995995 - Disclosure - Note 11 - Reinsurance (Details Textual)
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996005 - Disclosure - Note 13 - Credit Agreements (Details Textual)
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996015 - Disclosure - Note 14 - Business Acquisitions (Details Textual)
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996025 - Disclosure - Note 14 - Business Acquisitions - Summary of Allocation of Purchase Price to Fair Values of Assets Acquired and Liabilities Assumed (Details)
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996035 - Disclosure - Note 14 - Business Acquisitions - Summary of Intangible Assets were Comprised (Details)
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996045 - Disclosure - Note 14 - Business Acquisitions - Summary of Unaudited Pro Forma Financial Information (Details)
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996055 - Disclosure - Note 15 - Subsequent Events - Additional Information (Details)
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999009 - Disclosure - Anchoring
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Equity securities
Equity securities, at fair value (cost: $38,482 in 2025; $32,987 in 2024)
Equity Securities, FV-NI, Total
Equity securities, at fair value (cost: $109,595 in 2026; $81,772 in 2025)
Released, weighted average grant date fair value (in dollars per share)
Vested, weighted average grant date fair value (in dollars per share)
Business Combination, Acquisition-Related Cost, Expense
Acquisition-related expenses
Proceeds from Sale of Property, Plant, and Equipment
Proceeds from Sale of Property, Plant, and Equipment, Total
Proceeds from sale of property and equipment
Reinsurance recoverable on unpaid losses and loss adjustment expenses
Add: Reinsurance recoverables on unpaid losses and LAE at end of period
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
Schedule of Nonvested Performance-Based Units Activity [Table Text Block]
Entity Incorporation, State or Country Code
Preferred Stock, Shares Issued (in shares)
Preferred Stock, Shares Issued (in shares)
us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
Current year
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
Dividends Payable, Amount Per Share
Cash dividend per common share
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
Other comprehensive (loss) income before reclassification
Fair Value, Inputs, Level 2 [Member]
Common Stock, Shares Authorized (in shares)
Common Stock, Shares Authorized (in shares)
Finite-Lived Intangible Asset, Expected Amortization, Year Four
Year ended December 31, 2030
Chris Uchida [Member]
Chris Uchida.
us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
Total incurred
Amount of increase (decrease) in additional paid in capital (APIC) resulting from policyholder contribution to surplus.
Policyholder contribution to surplus
Policyholder contribution to surplus
Product and Service [Axis]
Document Fiscal Period Focus
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
Legal Entity of Counterparty, 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
Number Of Additional Stock Price Milestones Achieved
Represents 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)
Common Stock, Shares, Issued (in shares)
Common Stock, Shares, Issued (in shares)
TEXAS
Texas
Intangible Assets Net Including Goodwill [Line Items]
Intangible assets net including goodwill.
Asset Class [Domain]
Statement [Table]
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]
Put Option [Member]
livestock put options [Member]
Entity Filer Category
us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
Amounts reclassified from AOCI, net of tax
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders' equity
Equity [Table]
Equity.
us-gaap_PaymentsToAcquireMarketableSecurities
Purchases of equity securities
Unsecured Credit Facilities [Member]
Unsecured credit facilities.
Unsecured Credit Facilities
Business Combination, Voting Equity Interest Acquired, Percentage
Business Acquisition, Percentage of Voting Interests Acquired
Issuance of common stock via equity incentive plan (in shares)
Issuance of common stock via equity incentive plan (in shares)
Change in allowance for credit losses
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]
Reinsurance Disclosures [Abstract]
HAWAII
Hawaii
Derivative Asset, Notional Amount
Derivative assets, notional amount
Goodwill
Goodwill, Ending Balance
Goodwill, Beginning Balance
Goodwill, Total
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Reconciliation, Percent
Effective Income Tax Rate Reconciliation, Percent, Total
Income tax expense, percent
Finite-Lived Intangible Assets, Gross [Abstract]
Interest income
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
Partnership [Member]
Asset-Backed Securities [Member]
Asset-Backed Securities [Member]
Due after ten years, Amortized Cost
Due after ten years, Amortized Cost
Represents percentage of gross written premiums.
Percentage of Gross Written Premiums
Additional paid-in capital
Additional paid-in capital
Debt Issuance Costs, Net
Debt Issuance Costs, Net, Total
Share Repurchase Program [Axis]
Vesting [Domain]
Minnesota
MINNESOTA
Disaggregation of Revenue [Table]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Reinsurance [Text Block]
Investments Classified by Contractual Maturity Date [Table Text Block]
Basic earnings per share (in dollars per share)
Basic earnings per share
Basic (in dollars per share)
Disaggregation of Revenue [Table Text Block]
Repayments of Long-Term Debt
Repayments of Long-Term Debt, Total
Payments on term loan
Options, Outstanding, Number (in shares)
Outstanding, options (in shares)
Outstanding, options (in shares)
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]
Revolving Credit Facility [Member]
Revolving Credit Facility
Revolving Credit Facility [Member]
Finite-Lived Intangible Assets Acquired
Intangible assets
us-gaap_ProceedsFromSaleOfEquitySecuritiesFvNi
Proceeds from Sale of Equity Securities, FV-NI
Add: Balance acquired from FIA(1)
Balance acquired from FIA
Add: Balances acquired
Dividends Payable, Date of Record
Record date
Income Tax Paid, Federal, after Refund Received
Income Tax Paid, Federal, after Refund Received, Total
Cash paid for federal income taxes
Share Repurchase Program [Domain]
Sales and maturities of fixed maturity securities
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale, Total
Payments of Debt Issuance Costs
Payment of debt issuance costs
Stockholders' equity:
Stockholders' equity:
COLORADO
Colorado
Entity Small Business
Retained earnings
Retained earnings
Retained Earnings (Accumulated Deficit), Total
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Options cancelled (in shares)
Represents Palomar Specialty Insurance Company.
Palomar Specialty Insurance Company [Member]
PSIC
us-gaap_ReinsuranceRetentionAmountRetainedPerEvent
Reinsurance, Amount Retained, Per Event
Fair value amount of catastrophe bond.
plmr_CatastropheBondFaceValue
Catastrophe Bond, Face Value
Common Share equivalents (in shares)
Common Share equivalents
Catastrophic Event [Axis]
Amendment Flag
Net realized investment losses
Net realized investment (losses) gains
Product and Service [Domain]
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
Inland Marine and Property [Member]
Inland Marine and Property.
Inland Marine and Property
Debt Securities, Available-for-Sale [Line Items]
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.
Surety And Credit [Member]
Surety and Credit.
Surety & Credit
Entity Address, Address Line One
Deferred Tax Liabilities, Gross
Deferred Tax Liabilities, Gross, Total
Deferred tax liabilities, net
Fair Value Hierarchy and NAV [Axis]
Earnings Per Share [Abstract]
Supplementary cash flow information:
Derivative Asset
Derivative Asset, Total
Derivative assets at fair value
Goodwill and Intangible Assets
Goodwill and Intangible Assets Disclosure [Text Block]
Fair value
Debt Securities, Available-for-Sale, Unrealized Loss Position
Fair value
us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
Purchases of fixed maturity securities
Earthquake [Member]
Earthquake
Document Type
Change in unearned premiums
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]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net (decrease) increase in cash, cash equivalents and restricted cash
Subsequent Event Type [Domain]
Goodwill and intangible assets, net
Goodwill and intangible assets, net
Total Goodwill and intangible assets, net
Beginning Balance
Ending Balance
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)
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), net of tax
Other comprehensive (loss) income
Other comprehensive income (loss), net of tax
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
Customer Relationships and Other Intangible Assets [Member]
Customer relationships and other intangible assets.
Customer Relationships and Other Intangible Assets [Member]
Total, Fair Value
Debt Securities, Available-for-sale
Available-for-Sale, Fair Value
Fixed maturity securities available for sale, at fair value (amortized cost: $1,523,005 in 2026; $1,227,605 in 2025)
Fixed maturity securities available for sale, at fair value (amortized cost: $1,523,005 in 2026; $1,227,605 in 2025)
us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Options exercised, options (in shares)
Debt Disclosure [Abstract]
Two Thousand Twenty Six Repurchase Program [Member]
Two thousand twenty six repurchase program.
2026 Repurchase Program [Member]
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
Document Quarterly Report
Other assets
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent
CALIFORNIA
California
Customer Relationships [Member]
Customer Relationships
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)
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
Net comprehensive income
Available-for-sale, Accumulated Gross Unrealized Gain
Available-for-sale, Accumulated Gross Unrealized Gain
us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Total (in shares)
Geographical [Axis]
Represents special revenue excluding asset backed securities.
Special Revenue Excluding Asset Backed Securities [Member]
Special Revenue Excluding Asset Backed Securities [Member]
Two Thousand Twenty One Credit Agreement [Member]
2021 Credit Agreement.
2021 Credit Agreement
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]
Performance Shares [Member]
Performance Shares
Deferred tax assets, net
Deferred tax assets, net
Deferred tax asset
Sales of equity securities
Subsequent Event [Member]
Subsequent Events [Member]
Equity [Line Items]
Equity.
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Amount reclassified to earnings
Business Combination, Intangible Asset, Acquired, Finite-Lived [Table]
Other underwriting expenses
WASHINGTON
Washington
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]
Summary of Operations and Basis of Presentation
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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Proceeds from Sale of Debt Securities, Available-for-Sale
Share-Based Payment Arrangement, Cost by Plan [Table Text Block]
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent [Member]
us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Asset, Expected Amortization, after Year Five
Therafter
Casualty Favorable Development Related To Discontinued Lines [Member]
Casualty favorable development related to discontinued lines.
Casualty Favorable Development Related to Discontinued Lines [Member]
Value of business acquired (VOBA)
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Value of Business Acquired
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Value of Business Acquired.
Represents other states.
Other States [Member]
Other
Business Combination, Consideration Transferred
Business Combination, Consideration Transferred
Business Combination, Consideration Transferred, Total
State Licenses [Member]
State licenses.
State Licenses [Member]
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, 0 shares issued and outstanding as of June 30, 2026 and December 31, 2025
Preferred stock, $0.0001 par value, 5,000,000 shares authorized, 0 shares issued and outstanding as of June 30, 2026 and December 31, 2025
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill
Intangible assets
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill, Total
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
Vested, weighted average grant date fair value (in dollars per share)
Financial Instrument [Axis]
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
Amortization of Intangible Assets
Amortization
Amortization expense
Fair Value, Inputs, Level 3 [Member]
Ceded unearned premiums
Ceded unearned premiums
Prepaid Reinsurance Premiums
Segment Reporting [Abstract]
Business Combination, Recognized Asset Acquired, Asset
Total assets
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Stock Repurchased and Retired During Period, Value
Repurchases of common stock
Repurchases of common stock
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]
us-gaap_PaymentsForLossesAndLossAdjustmentExpense
Total payments
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)
Excess of loss protection amount of reinsurance policy.
plmr_ReinsurancePolicyExcessOfLossProtectionAmount
Reinsurance Policy, Excess of Loss Protection Amount
Ceded premium payable
Ceded premium payable
us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Debt Instrument, Basis Spread on Variable Rate
Forecast [Member]
Forecast [Member]
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 gains on equity method investment
Net proceeds from (purchases of) derivative contracts
Gain (Loss) on Derivative Instruments, Net, Pretax
Gain (Loss) on Derivative Instruments, Net, Pretax, Total
Loss on derivative instruments, net, pretax
Reserve for losses and loss adjustment expenses
Reserve for losses and LAE gross of reinsurance recoverables on unpaid losses and LAE at end of period
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
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent
Cash and cash equivalents
Basic (in shares)
Basic
Gain (Loss) on Securities [Table Text Block]
Scenario [Axis]
Represents vesting on first anniversary.
Share Based Payment Arrangement Tranche One First Anniversary [Member]
Document Information [Line Items]
Capitalizations Of Intangible Assets
Capitalizations of intangible assets.
Capitalizations
Segment Reporting, Expense Information Used by CODM, Description
Options [Member]
Options
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Performance Shares
us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
12 Months or Longer, Accumulated Loss
Funds held under reinsurance treaty
Funds held under reinsurance treaty
Subsequent Events
Subsequent Events [Text Block]
Long-Term Debt
Long-Term Debt, Total
Term loan
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
Balance
us-gaap_StockholdersEquity
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 Presentation
Basis of Accounting, Policy [Policy Text Block]
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
us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax
Federal income tax expense
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year
Remainder of 2026
Use of Estimates, Policy [Policy Text Block]
Use of Estimates
us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent
Other comprehensive (loss) income before reclassification, net of tax
Fair Value Disclosures [Text Block]
Prepaid expenses and other assets
Prepaid expenses and other assets
Intangible Asset, Acquired, Finite-Lived [Line Items]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]
Acquisition expenses[Member]
Acquisition expensesMember.
Acquisition Expenses
Plan Name [Domain]
Interest expense
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Entity [Domain]
Gains on sales of equity securities
Due after ten years, Fair Value
Due after ten years, Fair Value
Credit Facility [Axis]
Business Combination, Intangible Asset, Acquired, Finite-Lived and Indefinite-Lived [Table Text Block]
Summary of Intangible Assets were Comprised
Vested and Exercisable, options, weighted average exercise price (in dollars per share)
Accrued Income Taxes
Accrued Income Taxes, Total
Income taxes payable
Income taxes payable
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]
us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Reserve for losses and LAE net of reinsurance recoverables at end of period
Reserve for losses and LAE net of reinsurance recoverables at beginning of period
Reserve for losses and loss adjustment expense, net of reinsurance
Palomar Casualty and Surety Company [Member]
Palomar Casualty and Surety Company.
PCSC
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income before income taxes
Loss before income taxes
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]
Two Thousand Twenty Five Repurchase Program [Member]
Two thousand twenty five repurchase program.
2025 Repurchase Program [Member]
Reinsurance Retention [Line Items]
VOBA
VOBA [Member]
VOBA Member.
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
Stock-based compensation expense
Stock-based compensation
Document Period End Date
Fair Value Hierarchy and NAV [Domain]
Crop Lines [Member]
Crop lines.
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life
Intangible assets, Useful life
Statement of Financial Position [Abstract]
Restricted Stock Units (RSUs) [Member]
us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss
Losses on sales of fixed maturity securities
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
O2026Q3Dividends [Member]
O2026 Q3 Dividends
O 2026 Q3 Dividends [Member]
Expenses:
us-gaap_Liabilities
Total liabilities
Financial Instruments [Domain]
us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent
Amounts reclassified from AOCI
Gross written premiums
Premiums Written, Gross, Total
Premiums Written, Gross
Gross written premiums
Term
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period
Intangible Assets, Net (Including Goodwill) [Abstract]
Dividends
Dividends, Total
Aggregate dividend payment
Restricted cash
Restricted cash
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Income Taxes Payable
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Income Taxes Payable.
Income taxes payable
NEW YORK
New York
Variable Rate [Axis]
Finite-Lived Intangible Assets, Gross
Finite-Lived Intangible Assets, Gross, Total
Cost
ILLINOIS
Illinois
us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Less than 12 Months, Accumulated Loss
Diluted (in shares)
Diluted (in shares)
Diluted
Entity File Number
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited, shares (in shares)
Federal income tax (benefit) expense
Federal income tax benefit (expense)
Scenario [Domain]
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]
Subsequent Event [Table]
Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax
Pro forma net income
Derivative Assets (Liabilities), at Fair Value, Net
Derivative Assets (Liabilities), at Fair Value, Net, Total
Derivative assets at fair value
Derivative assets
Dividend income
Business Combination, Recognized Liability Assumed, Accounts Payable, Current
Accounts payable and other accrued liabilities
Business Combination, Pro Forma Information [Line Items]
Share Repurchase Program, Expiration Date
Share repurchase program, expiration date
Finite-Lived Intangible Assets, Net
Finite-Lived Intangible Assets, Net, Ending Balance
Finite-Lived Intangible Assets, Net, Beginning Balance
Net carrying amount
Goodwill [Member]
Goodwill [Member]
Continental hurricane [Member]
Continental hurricane [Member]
Continental Hurricane [Member]
Represents employee stock purchase plan 2019.
Employee Stock Purchase Plan 2019 [Member]
New Accounting Pronouncements, Policy [Policy Text Block]
Recent Accounting Pronouncements
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)
Comprehensive Income (Loss) Note [Text Block]
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Unearned Premiums
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Unearned Premiums.
Unearned premiums
Proceeds from Issuance of Long-Term Debt
Proceeds from Issuance of Long-Term Debt, Total
Proceeds from term loan
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
Common Stock, Shares, Outstanding (in shares)
Common Stock, Shares, Outstanding (in shares)
Common Stock, Shares, Outstanding, Ending Balance
Common Stock, Shares, Outstanding, Beginning Balance
Liability for Unpaid Claims And Claims Adjustment Expense Incurred Claims Losses
Liability for Unpaid Claims And Claims Adjustment Expense Incurred Claims Losses.
Incurred losses
Dividends [Domain]
Document Transition Report
2025 Award
Two Thousand Twenty Five Award [Member]
Two Thousand Twenty Five Award [Member]
Payments for Repurchase of Common Stock
Repurchases of common stock
Noncompete Agreements [Member]
Noncompete Agreements
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid (Refunded), Prior Years.
plmr_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidRefundedPriorYears
Prior years
Statement of Cash Flows [Abstract]
Issuance of common stock in stock offering, net of offering costs
Stock Issued During Period, Value, New Issues
us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Acquisitions, net of cash acquired
Equity [Text Block]
Earnings Per Share [Text Block]
Intangible Assets Net Including Goodwill [Table]
Intangible assets net including goodwill.
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Net income
Net income
Outstanding, options, aggregate intrinsic value
Inland Marine and Property Lines [Member]
Inland Marine And Property Lines [Member]
Inland Marine and Property lines.
us-gaap_DebtAndEquitySecuritiesGainLoss
Net realized and unrealized gains on investments
Net unrealized gains on equity securities
Net unrealized gains on equity securities
Schedule of Information of Each Major Intangible Asset Class Subject to Amortization [Table Text Block]
Schedule of information of each major intangible asset class subject to amortization.
Line of Credit Facility [Line Items]
Hurricane [Member]
Schedule Of Capital Reserved For Future Issuance [Line Items]
Schedule of capital reserved for future issuance.
Vested and Exercisable, options, aggregate intrinsic value
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Risk-free interest rate
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]
Represents the Laulima Insurance Company.
Laulima Insurance Company [Member]
Laulima
Investing activities
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Term Loan
Term Loan [Member]
Term loan.
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Reinsurance Recoverable
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Reinsurance Recoverable
Reinsurance recoverable
Finite-Lived Intangible Asset, Expected Amortization, Year One
Year ended December 31, 2027
Two Thousand Twenty Six Award [Member]
Two thousand twenty six award member.
2026 Award
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
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]
FLORIDA
Florida
Net assets acquired
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table]
us-gaap_LineOfCredit
Long-Term Line of Credit
Long-Term Line of Credit, Total
Line of credit
Business Combination, Pro Forma Information [Table Text Block]
Summary of Unaudited Pro Forma Financial Information
us-gaap_AssetsFairValueDisclosure
Total assets
Business Combination, Recognized Liability Assumed, Deferred Tax Liability
Deferred tax liability
Proceeds from common stock issued via employee stock purchase plan
Proceeds from common stock issued via equity incentive plans
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
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
Weighted-average common shares outstanding:
Income Tax Disclosure [Text Block]
Note 16 - Income Taxes
Surety and Credit Lines [Member]
Surety and credit lines.
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
us-gaap_PaymentsForSoftware
Capitalized software costs
Document Information [Table]
Consolidated Entities [Axis]
Legal Entity [Axis]
Due after one year through five years, Fair Value
Due after one year through five years, Fair Value
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Outstanding, options, weighted average exercise price (in dollars per share)
Outstanding, options, weighted average exercise price (in dollars per share)
Income Tax Disclosure [Abstract]
Fair Value, Recurring and Nonrecurring [Table]
Business Combination [Text Block]
Business Acquisitions
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Reserve for Losses and Loss Adjustment Expenses
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Reserve for Losses and Loss Adjustment Expenses.
Reserve for losses and loss adjustment expenses
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
Statement of Income Location, Balance [Axis]
Trading Symbol
Schedule Of Capital Reserved For Future Issuance [Table]
Schedule of capital reserved for future issuance.
Due within one year, Amortized Cost
Due within one year, Amortized Cost
Value of Business Acquired [Member]
Value of business acquired.
Value of Business Acquired (VOBA) [Member]
Subsequent Event Type [Axis]
Financing activities
us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage
Fair Value, Recurring [Member]
Represents earthquake premiums.
Earthquake Premiums [Member]
Earthquake
Represents Equity Incentive Plan 2019.
Equity Incentive Plan 2019 [Member]
Other underwriting expenses [member]
Other underwriting expenses member.
Other Underwriting Expenses
Impairment of goodwill or other intangible assets
Goodwill and Intangible Asset Impairment
Goodwill and Intangible Asset Impairment, Total
us-gaap_CededPremiumsWritten
Ceded written premiums
Ceded Premiums Written
Ceded premiums written
Equity Components [Axis]
Vested and Exercisable, options, weighted average remaining contractual term (Year)
Equity Component [Domain]
Share-Based Payment Arrangement, Activity [Table Text Block]
Asset Class [Axis]
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
Total investments
us-gaap_Investments
Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block]
Summary of Allocation of Purchase Price to Fair Values of Assets Acquired and Liabilities Assumed
Business Combination [Axis]
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
Derivative, Fair Value, Net
Derivative, Fair Value, Net, Total
Fair value of derivative instrument
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)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)
us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
Federal Home Loan Bank, Advance, Branch of FHLBank, Amount
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
Represents Hawaii Hurricane.
Hawaii Hurricane [Member]
Maximum [Member]
Dividends Payable, Date to be Paid
Dividend payable date
Statistical Measurement [Axis]
Options exercised, options, weighted average exercise price (in dollars per share)
us-gaap_PremiumsWrittenNet
Net written premiums
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization
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, 26,186,979 and 26,520,417 shares issued and outstanding as of June 30, 2026 and December 31, 2025, respectively
Common stock, $0.0001 par value, 500,000,000 shares authorized, 26,186,979 and 26,520,417 shares issued and outstanding as of June 30, 2026 and December 31, 2025, respectively
Finite Lived Intangible Assets Gross [Table]
Finite lived intangible assets gross.
Line of Credit Facility, Expiration Date
Line of Credit Facility, Maturity Date
Dividends [Axis]
Represents securities on deposit with state regulatory authorities.
Securities on Deposit With State Regulatory Authorities [Member]
Secured Overnight Financing Rate (SOFR) [Member]
Gains on sales of fixed maturity securities
Legal Entity Type of Counterparty [Domain]
Net unrealized gains on securities available for sale
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent, Total
Net unrealized gains (losses) on securities available for sale
Premiums receivable
Premiums receivable
us-gaap_BenefitsLossesAndExpenses
Total expenses
Other operating expenses
Current year
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
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
us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss
Accumulated Loss
Accounts payable and other accrued liabilities
Accounts payable and other accrued liabilities
Accounts payable and other liabilities
Employee Stock [Member]
Business Combination [Table]
Schedule of reconciliation of changes in the ending balance of each major intangible asset class.
Schedule of Reconciliation of Changes in the Ending Balance of Each Major Intangible Asset Class [Table Text Block]
Entity Registrant Name
Debt Disclosure [Text Block]
Credit Agreements
us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Available-for-sale, Accumulated Gross Unrealized Loss
Finite-Lived Intangible Asset, Expected Amortization, Year Two
Year ended December 31, 2028
us-gaap_TreasuryStockSharesAcquired
Treasury Stock, Shares, Acquired (in shares)
Accumulated Other Comprehensive Income (Loss) [Table]
us-gaap_EquitySecuritiesFvNiRealizedLoss
Losses on sales of equity securities
Losses on sales of equity securities
Subsequent Events [Abstract]
Liability for Claims and Claims Adjustment Expense [Line Items]
The tabular disclosure of common stock reserved for future issuance.
Schedule of Capital Reserved for Future Issuance [Table Text Block]
Consolidated Entities [Domain]
Finite-Lived Intangible Asset, Expected Amortization, Year Three
Year ended December 31, 2029
Income tax expense
Income tax benefit
Income tax expense
Measurement Frequency [Axis]
Other investments
Other investments
Other Investments, Total
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]
Entity Common Stock, Shares Outstanding
US States and Political Subdivisions Debt Securities [Member]
US States and Political Subdivisions Debt Securities [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 on investments
Net realized and unrealized (gains) losses on investments
Gain (Loss) on Investments, Total
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)
us-gaap_Assets
Total assets
Income Statement [Abstract]
Jon Christianson [Member]
Jon Christianson.
Business Combination, Pro Forma Information [Table]
Stock Issued During Period, Shares, New Issues
Issuance of common stock in stock offering, net of offering costs (in shares)
The Gray Casualty and Surety Company [Member]
The gray casualty and surety company member.
Gray Casualty & Surety Company
Unearned premiums
Unearned premiums
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Released, shares (in shares)
Vested, shares (in shares)
Per Share Data:
Business Combination [Abstract]
Diluted earnings per share (in dollars per share)
Diluted earnings per share
Diluted (in dollars per share)
Finite-Lived Intangible Asset, Expected Amortization, Year Five
Year ended December 31, 2031
Disaggregation of Revenue [Abstract]
Mortgage and asset-backed securities, Fair Value
Mortgage and asset-backed securities, Fair Value
City Area Code
Pro forma revenue
Business Combination, Pro Forma Information, Pro Forma Revenue
State Licenses
Licensing Agreements [Member]
Debt Instrument, Face Amount
Represents number of stock price milestones achieved.
plmr_NumberOfStockPriceMilestonesAchieved
Number of Stock Price Milestones Achieved
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Maximum Borrowing Capacity
Business Combination [Line Items]
Number Of Points
Number of points.
Number of points
Insurance [Abstract]
Issuance of common stock via employee stock purchase plan
Issuance of common stock via employee stock purchase plan
Award Date [Axis]
Investments:
Stock-based compensation
Stock-based compensation
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.
Impairment charges
Impairment of Intangible Assets, Finite-Lived
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]
Less than 12 Months, fair value
Less than 12 Months, fair value
Fair Value, Inputs, Level 1 [Member]
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by financing activities
Due after five years through ten years, Fair Value
Due after five years through ten years, Fair Value
Business Combination, Recognized Asset Acquired, Receivable, Current
Receivables (premiums and investment income)
Business Combination, Recognized Asset Acquired, Investment in Debt and Equity Securities, Current
Investments
Debt Securities, Available-for-Sale [Table]
Entity Interactive Data Current
Represents U.S. hurricane.
U.S. Hurricane [Member]
us-gaap_PaymentsForAdvanceToAffiliate
Investments in limited partnerships and other assets
Statement of Income Location, Balance [Domain]
Operating activities
Catastrophic Event [Domain]
OKLAHOMA
Oklahoma
Common Stock, Dividends, Per Share, Declared
Cash dividend declared per common share
Represents crops.
Crop [Member]
Crop
Option Indexed to Issuer's Equity, Type [Domain]
Note 3 - Fair Value Measurements
Entity Tax Identification Number
Finite Lived Intangible Assets Gross [Line Items]
Finite lived intangible assets gross.
Local Phone Number
Accumulated Other Comprehensive Income (Loss) [Line Items]
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount
Unrecognized stock-based compensation expense related to stock options
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]
Revenue from Contract with Customer, Excluding Assessed Tax
Revenue
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)
Represents Palomar Excess And Surplus Insurance Company.
Palomar Excess And Surplus Insurance Company [Member]
PESIC
Entity Emerging Growth Company
Note 7 - Underwriting Information