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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2019     $ 81,750  
Amounts reclassified from AOCI, HTM related $ 0 $ (2) (5) $ (26)
Amount reclassified into net income: Net actuarial loss 596 525 1,787 1,574
Other comprehensive income 35,124 29,920 105,340 176,382
Other comprehensive income, defined pension and post retirement plans 596 525 1,787 1,574
Ending Balance, September 30, 2020 187,090   187,090  
Available-for-sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2019     170,439  
OCI before reclassifications     104,771  
Amounts reclassified from AOCI, All Other     7,210  
Other comprehensive income     111,981  
Ending Balance, September 30, 2020 282,420   282,420  
Investments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2019     170,393  
OCI before reclassifications     90,020  
Amounts reclassified from AOCI     13,533  
Other comprehensive income     103,553  
Ending Balance, September 30, 2020 273,946   273,946  
Accumulated Other-than-Temporary Impairment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2019     (71)  
OCI before reclassifications     (14,751)  
Amounts reclassified from AOCI, OTTI     6,328  
Other comprehensive income     (8,423)  
Ending Balance, September 30, 2020 (8,494)   (8,494)  
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Held-to-maturity Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2019     25  
OCI before reclassifications     0  
Amounts reclassified from AOCI, HTM related     (5)  
Other comprehensive income     (5)  
Ending Balance, September 30, 2020 20   20  
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2019     (88,643)  
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans     0  
Amount reclassified into net income: Net actuarial loss     1,787  
Ending Balance, September 30, 2020 (86,856)   (86,856)  
Accumulated other comprehensive income (loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2019     81,750  
OCI before reclassifications     90,020  
Amounts reclassified from AOCI     15,320  
Other comprehensive income 35,124 $ 29,920 105,340 $ 176,382
Ending Balance, September 30, 2020 $ 187,090   $ 187,090