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Fair Value of Financial Instruments - Rollforward of Balance Sheet Amounts Within Level 3 Valuation Hierarchy (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 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 $ 199,420,000 $ 168,312,000 176,551,000 157,140,000
Total realized gains (losses) included in income 4,822,000 2,414,000 8,396,000 1,879,000
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 12,879,000 5,608,000 37,501,000 22,910,000
Issuances 0 0 0 0
Settlements (1,476,000) (6,078,000) (6,803,000) (11,673,000)
Transfers out of Level 3 0 0 0 0
Fair value, end of period 215,645,000 170,256,000 215,645,000 170,256,000
Total net realized gains (losses) included in income 4,822,000 2,414,000 8,396,000 1,879,000
Recurring | Available-for-sale Securities        
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]        
Fair value, beginning of period 13,086,000 13,197,000 13,224,000 479,000
Total realized gains (losses) included in income 14,000 13,000 40,000 39,000
Changes in unrealized gains/losses included in other comprehensive income (loss) 0 2,000 2,000 18,000
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 (173,000) 0 (339,000) (165,000)
Transfers out of Level 3 0 0 0 0
Fair value, end of period 12,927,000 13,212,000 12,927,000 13,212,000
Total net realized gains (losses) included in income 14,000 13,000 40,000 39,000
Recurring | Servicing Contracts        
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]        
Fair value, beginning of period 10,903,000 11,301,000 11,854,000 0
Total realized gains (losses) included in income (219,000) (343,000) (1,170,000) 10,958,000
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 0
Fair value, end of period 10,684,000 10,958,000 10,684,000 10,958,000
Total net realized gains (losses) included in income $ (219,000) $ (343,000) $ (1,170,000) $ 10,958,000