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Fair Value of Financial Instruments - Rollforward of Level 3 Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Investment gains (losses) and accretion (amortization) recognized in earnings $ 300 $ 1,800 $ 1,000 $ 1,900
Fair Value, Recurring Measurements [Member]        
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Level 3 assets, beginning of period   10,453 1,543 2,144 [1]
Net unrealized gains (losses) included in other comprehensive income (loss)   $ 146   $ 185 [1]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]   OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax   OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax
Investment gains (losses) and accretion (amortization) recognized in earnings   $ (31) (714) $ (72) [1]
Purchases 3,000 1,851 3,000 10,666 [1]
Settlements     (829)  
Transfers into Level 3   (8,981)   (9,485) [1]
Level 3 assets, end of period $ 3,000 $ 3,438 [1] $ 3,000 $ 3,438 [1]
[1] Transfers of investments that enter and exit Level 3 in different quarters within the same fiscal year are not eliminated until the full year amounts are presented.