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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, $ 220,186    
Amount reclassified from AOCI, HTM (9) $ (19) $ (46)
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans 17,093 (1,197) (10,898)
Amounts reclassified from AOCI,All other (3,022) 4,247 530
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 19,283 3,579 (8,799)
Other comprehensive (loss) income (105,087) 138,436 159,706
Balance December, 115,099 220,186  
Accumulated Other-than-Temporary Impairment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, (2,546) (71)  
Amounts reclassified into net income: Credit loss related 5,418 3,984  
Other comprehensive (loss) income (1,741) (2,475)  
Balance December, (4,287) (2,546) (71)
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
OCI before reclassifications (7,159) (6,459)  
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, December 31, 2018     (88,643)
Balance December, (85,064)    
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans 17,093 1,197  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 2,190 2,382  
Balance December, (65,781) (85,064)  
Accumulated other comprehensive (loss) income [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, December 31, 2018     81,750
Balance December, 220,186    
OCI before reclassifications (109,664) 127,842  
Amount reclassified from AOCI 4,577 10,594  
Other comprehensive (loss) income (105,087) 138,436 159,706
Balance December, 115,099 220,186  
Held-to-maturity Securities [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, December 31, 2018     25
Balance December, 6    
OCI before reclassifications 0 0  
Other comprehensive (loss) income (9) (19)  
Balance December, (3) 6  
Available-for-sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, December 31, 2018     170,439
Balance December, 307,790    
OCI before reclassifications (119,598) 133,104  
Amounts reclassified from AOCI,All other (3,022) 4,247  
Other comprehensive (loss) income (122,620) 137,351  
Balance December, 185,170 307,790  
Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, December 31, 2018     $ 170,393
Balance December, 305,250    
OCI before reclassifications (126,757) 126,645  
Amount reclassified from AOCI 2,387 8,212  
Other comprehensive (loss) income (124,370) 134,857  
Balance December, $ 180,880 $ 305,250