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Fair Value of Financial Instruments - Rollforward of Balance Sheet Amounts Within Level 3 Valuation Hierarchy (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 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 $ 191,945,000 $ 162,235,000 176,551,000 157,140,000
Total realized gains (losses) included in income 3,391,000 179,000 3,574,000 (535,000)
Changes in unrealized gains/losses included in other comprehensive income (loss) 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 0
Purchases 7,702,000 9,835,000 24,622,000 17,302,000
Issuances 0 0 0 0
Settlements (3,618,000) (3,937,000) (5,327,000) (5,595,000)
Transfers out of Level 3   0 0 0
Fair value, end of period 199,420,000 168,312,000 199,420,000 168,312,000
Total net realized gains (losses) included in income 3,391,000 179,000 3,574,000 (535,000)
Recurring | Available-for-sale Securities        
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]        
Fair value, beginning of period 13,073,000 13,184,000 13,224,000 479,000
Total realized gains (losses) included in income 13,000 13,000 26,000 26,000
Changes in unrealized gains/losses included in other comprehensive income (loss) 0 0 2,000 16,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 12,841,000
Purchases 0 0 0 0
Issuances 0 0 0 0
Settlements 0 0 (166,000) (165,000)
Transfers out of Level 3 0 0 0 0
Fair value, end of period 13,086,000 13,197,000 13,086,000 13,197,000
Total net realized gains (losses) included in income 13,000 13,000 26,000 26,000
Recurring | Servicing Contracts        
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]        
Fair value, beginning of period 11,215,000 11,812,000 11,854,000 0
Total realized gains (losses) included in income (312,000) (511,000) (951,000) 11,301,000
Changes in unrealized gains/losses included in other comprehensive income (loss) 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 0
Purchases 0 0 0 0
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers out of Level 3 0 0 0
Fair value, end of period 10,903,000 11,301,000 10,903,000 11,301,000
Total net realized gains (losses) included in income $ (312,000) $ (511,000) $ (951,000) $ 11,301,000