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Fair Value Measurements (Summarize Changes in Level 3 Assets) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Assets, Impairments   $ 0
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Assets, beginning balance $ 28,892 9,025
Assets, earnings (3,204) 386
Assets, other comprehensive income 352 (333)
Assets, Impairments 0  
Assets, purchases 6,160 0
Assets, (sales) (1,286) (223)
Assets, maturities 0 0
Assets. transfers out   20,037
Securities transferred into or out of level 3, net 1  
Assets, ending balance 30,915 28,892
Level 3 | Debt securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Assets, beginning balance 19,667 0
Assets, earnings 0 0
Assets, other comprehensive income 352 (333)
Assets, Impairments 0  
Assets, Impairments   0
Assets, purchases 0 0
Assets, (sales) 0 0
Assets, maturities 0 0
Assets. transfers out   20,000
Securities transferred into or out of level 3, net 0  
Assets, ending balance 20,019 19,667
Level 3 | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Assets, beginning balance 5,715 5,253
Assets, earnings 194 647
Assets, other comprehensive income 0 0
Assets, Impairments 0 0
Assets, purchases 6,160 0
Assets, (sales) (1,286) (185)
Assets, maturities 0 0
Assets. transfers out 0 0
Assets, ending balance 10,783 5,715
Level 3 | Common stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Assets, beginning balance 2,041 1,558
Assets, earnings 194 611
Assets, other comprehensive income 0 0
Assets, Impairments 0 0
Assets, purchases 0 0
Assets, (sales) (126) (128)
Assets, maturities 0 0
Assets. transfers out 0 0
Assets, ending balance 2,109 2,041
Level 3 | Preferred stocks    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Assets, beginning balance 3,674 3,695
Assets, earnings 0 36
Assets, other comprehensive income 0 0
Assets, Impairments 0 0
Assets, purchases 6,160 0
Assets, (sales) (1,160) (57)
Assets, maturities 0 0
Assets. transfers out 0 0
Assets, ending balance 8,674 3,674
Level 3 | Arbitrage trading account    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Assets, beginning balance 3,510 3,772
Assets, earnings (3,398) (261)
Assets, other comprehensive income 0 0
Assets, Impairments 0  
Assets, Impairments   0
Assets, purchases 0 0
Assets, (sales) 0 (38)
Assets, maturities 0 0
Assets. transfers out   37
Securities transferred into or out of level 3, net 1  
Assets, ending balance 113 3,510
Level 3 | Corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Assets, beginning balance 19,667 0
Assets, earnings 0 0
Assets, other comprehensive income 352 (333)
Assets, Impairments 0 0
Assets, purchases 0 0
Assets, (sales) 0 0
Assets, maturities 0 0
Securities transferred into or out of level 3, net 0 20,000
Assets, ending balance $ 20,019 $ 19,667