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Fair Value of Financial Instruments - Rollforward of Balance Sheet Amounts Within Level 3 Valuation Hierarchy (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Transfers out of Level 3 $ 0  
Available-for-sale Securities    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   $ 1
Recurring | Other investments    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Fair value, beginning of period 176,551,000 157,140,000
Total realized gains (losses) included in income 183,000 (714,000)
Changes in unrealized gains/losses included in other comprehensive income (loss) 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0
Purchases 16,920,000 7,467,000
Issuances 0 0
Settlements (1,709,000) (1,658,000)
Transfers out of Level 3 0
Fair value, end of period 191,945,000 162,235,000
Total net realized gains (losses) included in income 183,000 (714,000)
Recurring | Available-for-sale Securities    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Fair value, beginning of period 13,224,000 479,000
Total realized gains (losses) included in income 13,000 13,000
Changes in unrealized gains/losses included in other comprehensive income (loss) 2,000 16,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 12,841,000
Purchases 0 0
Issuances 0 0
Settlements (166,000) (165,000)
Transfers out of Level 3 0 0
Fair value, end of period 13,073,000 13,184,000
Total net realized gains (losses) included in income 13,000 13,000
Recurring | Servicing Contracts    
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]    
Fair value, beginning of period 11,854,000 0
Total realized gains (losses) included in income (639,000) 11,812,000
Changes in unrealized gains/losses included in other comprehensive income (loss) 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0
Purchases 0 0
Issuances 0 0
Settlements 0 0
Transfers out of Level 3 0 0
Fair value, end of period 11,215,000 11,812,000
Total net realized gains (losses) included in income $ (639,000) $ 11,812,000