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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, $ 81,750    
Amount reclassified from AOCI, HTM (19) $ (46) $ 87
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans 1,197 (10,898) (8,906)
Amounts reclassified from AOCI,All other 4,247 530 31,316
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 3,579 (8,799) (7,226)
Other comprehensive income (loss) 138,436 159,706 (73,107)
Balance December, 220,186 81,750  
Accumulated Other-than-Temporary Impairment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, (71) (71)  
Amounts reclassified into net income: Credit loss related 3,984 0  
Other comprehensive income (loss) (2,475) 0  
Balance December, (2,546) (71) (71)
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
OCI before reclassifications (6,459) 0  
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, December 31, 2018     (79,844)
Balance December, (88,643)    
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans 1,197 (10,898)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 2,382 2,099  
Balance December, (85,064) (88,643)  
Accumulated other comprehensive (loss) income [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, December 31, 2018     (77,956)
Balance December, 81,750    
OCI before reclassifications 127,842 157,123  
Amount reclassified from AOCI 10,594 2,583  
Other comprehensive income (loss) 138,436 159,706 (73,107)
Balance December, 220,186 81,750  
Held-to-maturity Securities [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, December 31, 2018     71
Balance December, 25    
OCI before reclassifications 0 0  
Other comprehensive income (loss) (19) (46)  
Balance December, 6 25  
Available-for-sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, December 31, 2018     1,888
Balance December, 170,439    
OCI before reclassifications 133,104 168,021  
Amounts reclassified from AOCI,All other 4,247 530  
Other comprehensive income (loss) 137,351 168,551  
Balance December, 307,790 170,439  
Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, December 31, 2018     $ 1,888
Balance December, 170,393    
OCI before reclassifications 126,645 168,021  
Amount reclassified from AOCI 8,212 484  
Other comprehensive income (loss) 134,857 168,505  
Balance December, $ 305,250 $ 170,393