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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
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 $ 168,312,000 $ 151,762,000 157,140,000 130,982,000
Total realized gains (losses) included in income 2,414,000 (77,000) 1,879,000 3,597,000
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 5,608,000 8,015,000 22,910,000 27,947,000
Issuances 0 0 0 0
Settlements (6,078,000) (3,037,000) (11,673,000) (5,863,000)
Transfers out of Level 3 0 0 0 0
Fair value, end of period 170,256,000 156,663,000 170,256,000 156,663,000
Total realized gains (losses) included in income 2,414,000 (77,000) 1,879,000 3,597,000
Recurring | Available-for-sale Securities        
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]        
Fair value, beginning of period 13,197,000 479,000 479,000 629,000
Total realized gains (losses) included in income 13,000 1,000 39,000 3,000
Changes in unrealized gains/losses included in other comprehensive income (loss) 2,000 (9,000) 18,000 (2,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 12,841,000 0
Purchases 0 0 0 0
Issuances 0 0 0 0
Settlements 0 0 (165,000) (159,000)
Transfers out of Level 3 0 0 0 0
Fair value, end of period 13,212,000 471,000 13,212,000 471,000
Total realized gains (losses) included in income 13,000 $ 1,000 39,000 $ 3,000
Recurring | Servicing Contracts        
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]        
Fair value, beginning of period 11,301,000   0  
Total realized gains (losses) included in income (343,000)   10,958,000  
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 10,958,000   10,958,000  
Total realized gains (losses) included in income $ (343,000)   $ 10,958,000