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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period $ (498,042)    
Net current period OCI 125,041 $ (613,141) $ (105,087)
Balance, end of period (373,001) (498,042)  
Held-to-maturity Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period 0 (3)  
OCI before reclassifications 0 0  
Amounts reclassified from AOCI 0 3  
Net current period OCI 0 3  
Balance, end of period 0 0 (3)
Available-for-sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period (295,197) 185,170  
OCI before reclassifications 84,407 (527,805)  
Amounts reclassified from AOCI 16,162 47,438  
Net current period OCI 100,569 (480,367)  
Balance, end of period (194,628) (295,197) 185,170
Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period (417,035) 180,880  
OCI before reclassifications 131,992 (676,300)  
Amounts reclassified from AOCI 5,973 78,385  
Net current period OCI 137,965 (597,915)  
Balance, end of period (279,070) (417,035) 180,880
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period (121,838) (4,287)  
OCI before reclassifications 47,585 (148,495)  
Amounts reclassified from AOCI (10,189) 30,944  
Net current period OCI 37,396 (117,551)  
Balance, end of period (84,442) (121,838) (4,287)
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period (81,007) (65,781)  
OCI before reclassifications (15,315) (16,543)  
Amounts reclassified from AOCI 2,391 1,317  
Net current period OCI 12,924 15,226  
Balance, end of period (93,931) (81,007) (65,781)
Accumulated other comprehensive income (loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period (498,042) 115,099  
OCI before reclassifications 116,677 (692,843)  
Amounts reclassified from AOCI 8,364 79,702  
Net current period OCI 125,041 (613,141) (105,087)
Balance, end of period $ (373,001) $ (498,042) $ 115,099