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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period $ 115,099    
Net current period OCI (613,141) $ (105,087) $ 138,436
Balance, end of period (498,042) 115,099  
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period (4,287) (2,546)  
OCI before reclassifications (148,495) (7,159)  
Amounts reclassified from AOCI 30,944 5,418  
Net current period OCI (117,551) (1,741)  
Balance, end of period (121,838) (4,287) (2,546)
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period (65,781) (85,064)  
OCI before reclassifications (16,543) 17,093  
Amounts reclassified from AOCI (1,317) (2,190)  
Net current period OCI 15,226 (19,283)  
Balance, end of period (81,007) (65,781) (85,064)
Accumulated other comprehensive (loss) income [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period 115,099 220,186  
OCI before reclassifications (692,843) (109,664)  
Amounts reclassified from AOCI (79,702) (4,577)  
Net current period OCI (613,141) (105,087) 138,436
Balance, end of period (498,042) 115,099 220,186
Held-to-maturity Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period (3) 6  
OCI before reclassifications 0 0  
Amounts reclassified from AOCI 3 (9)  
Net current period OCI 3 (9)  
Balance, end of period 0 (3) 6
Available-for-sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period 185,170 307,790  
OCI before reclassifications (527,805) (119,598)  
Amounts reclassified from AOCI (47,438) 3,022  
Net current period OCI (480,367) (122,620)  
Balance, end of period (295,197) 185,170 307,790
Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, beginning of period 180,880 305,250  
OCI before reclassifications (676,300) (126,757)  
Amounts reclassified from AOCI (78,385) (2,387)  
Net current period OCI (597,915) (124,370)  
Balance, end of period $ (417,035) $ 180,880 $ 305,250