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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance December, $ (77,956)      
Cumulative effect adjustment     $ 25,000  
Amounts reclassified into net income: Non-credit other-than-temporary impairment 0 $ 0 68  
Amount reclassified from AOCI, HTM (46) 87 (116)  
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans (10,898) (8,906) (3,700)  
Amounts reclassified from AOCI,All other 530 31,316 (4,537)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax (8,799) (7,226) (2,333)  
Other comprehensive income (loss) 159,706 (73,107) 36,120  
Balance December, 81,750 (77,956)    
Accumulated Other-than-Temporary Impairment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, December 31, 2017     (59)  
Balance December, (71) (71)    
Cumulative effect adjustment     (12)  
OCI before reclassifications 0 0    
Other comprehensive income (loss) 0 0    
Balance December, (71) (71) (71)  
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, December 31, 2017     (60,405)  
Balance December, (79,844) (72,618)    
Cumulative effect adjustment     (12,213)  
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans (10,898) (8,906)    
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 2,099 1,680    
Balance December, (88,643) (79,844) (72,618)  
Accumulated other comprehensive (loss) income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, December 31, 2017     20,170  
Balance December, (77,956) (4,849)    
Cumulative effect adjustment     (25,019)  
OCI before reclassifications 157,123 (106,190)    
Amount reclassified from AOCI 2,583 33,083    
Other comprehensive income (loss) 159,706 (73,107) 36,120  
Balance December, 81,750 (77,956) (4,849)  
Held-to-maturity Securities [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, December 31, 2017     (14)  
Balance December, 71 (16)    
Cumulative effect adjustment     (2)  
OCI before reclassifications 0 0    
Other comprehensive income (loss) (46) 87    
Balance December, 25 71 (16)  
Available-for-sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, December 31, 2017     80,648  
Balance December, 1,888 67,856    
Cumulative effect adjustment     (12,792)  
OCI before reclassifications 168,021 (97,284)    
Amounts reclassified from AOCI,All other 530 31,316    
Other comprehensive income (loss) 168,551 (65,968)    
Balance December, 170,439 1,888 67,856  
Investments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, December 31, 2017     80,575  
Balance December, 1,888 67,769    
Cumulative effect adjustment     (12,806)  
OCI before reclassifications 168,021 (97,284)    
Amount reclassified from AOCI 484 31,403    
Other comprehensive income (loss) 168,505 (65,881)    
Balance December, 170,393 1,888 67,769  
Accounting Standards Update 2016-01 [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative effect adjustment $ 0 (30,726) 0  
Accounting Standards Update 2016-01 [Member] | Accumulated other comprehensive (loss) income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative effect adjustment   $ 0 $ 30,726 $ 0