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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, $ 20,170    
Amounts reclassified into net income: Non-credit other-than-temporary impairment 0 $ 68 $ 138
Amount reclassified from AOCI, HTM 87 (116) (92)
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans (8,906) (3,700) (7,852)
Amounts reclassified from AOCI,All other 31,316 (4,537) 3,064
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax (7,226) (2,333) (3,652)
Other comprehensive (loss) income (73,107) 36,120 (6,525)
Balance December, (77,956) 20,170  
Accumulated Other-than-Temporary Impairment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, (59) (150)  
Cumulative effect adjustment [1]   (12)  
OCI before reclassifications 0 23  
Other comprehensive (loss) income 0 91  
Balance December, (71) (59) (150)
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, (60,405) (58,072)  
Cumulative effect adjustment [1]   (12,213)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 1,680 1,367  
Balance December, (79,844) (60,405) (58,072)
Accumulated other comprehensive (loss) income [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, 20,170 (15,950)  
Cumulative effect adjustment [1]   (25,019)  
OCI before reclassifications (106,190) 39,338  
Amount reclassified from AOCI 33,083 (3,218)  
Other comprehensive (loss) income (73,107) 36,120 (6,525)
Balance December, (77,956) 20,170 (15,950)
Held-to-maturity Securities [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, (14) 102  
Cumulative effect adjustment [1]   (2)  
OCI before reclassifications 0 0  
Other comprehensive (loss) income 87 (116)  
Balance December, 71 (14) 102
Available-for-sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, 80,648 42,170  
Cumulative effect adjustment [1]   (12,792)  
OCI before reclassifications (97,284) 43,015  
Other comprehensive (loss) income (65,968) 38,478  
Balance December, 1,888 80,648 42,170
Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, 80,575 42,122  
Cumulative effect adjustment [1]   (12,806)  
OCI before reclassifications (97,284) 43,038  
Amount reclassified from AOCI 31,403 (4,585)  
Other comprehensive (loss) income (65,881) 38,453  
Balance December, 1,888 80,575 $ 42,122
Adjustments for New Accounting Pronouncement [Member] | Accumulated Other-than-Temporary Impairment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, (71)    
Balance December,   (71)  
Adjustments for New Accounting Pronouncement [Member] | Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, (72,618)    
Balance December,   (72,618)  
Adjustments for New Accounting Pronouncement [Member] | Accumulated other comprehensive (loss) income [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, (4,849)    
Balance December,   (4,849)  
Adjustments for New Accounting Pronouncement [Member] | Held-to-maturity Securities [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, (16)    
Balance December,   (16)  
Adjustments for New Accounting Pronouncement [Member] | Available-for-sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, 67,856    
Balance December,   67,856  
Adjustments for New Accounting Pronouncement [Member] | Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance December, $ 67,769    
Balance December,   $ 67,769  
[1] Upon adoption of ASU 2016-01 and ASU 2018-02 in the first quarter of 2018, we recognized a $25.0 million cumulative-effect adjustment to the opening balance of AOCI, which represents the after-tax net unrealized gain on our equity portfolio as of December 31, 2017 and the one-time reclassification from AOCI to retained earnings for the stranded tax assets that were created in AOCI from the enactment of Tax Reform. See Note 3. "Adoption of Accounting Pronouncements" above for additional information.