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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2020     $ 220,186  
Amounts reclassified from AOCI, HTM related $ (2) $ (25) (4) $ (5)
Amount reclassified into net income: Net actuarial loss 548 595 1,095 1,191
Other comprehensive income (loss) 34,771 174,083 (50,815) 70,216
Other comprehensive income, defined pension and post retirement plans 548 595 1,095 1,191
Ending Balance, June 30, 2021 169,371   169,371  
Available-for-sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2020     307,790  
OCI before reclassifications     (53,527)  
Amounts reclassified from AOCI, All Other     523  
Other comprehensive income (loss)     (53,004)  
Ending Balance, June 30, 2021 254,786   254,786  
Investments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2020     305,250  
OCI before reclassifications     (54,582)  
Amounts reclassified from AOCI     2,672  
Other comprehensive income (loss)     (51,910)  
Ending Balance, June 30, 2021 253,340   253,340  
Accumulated Other-than-Temporary Impairment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2020     (2,546)  
OCI before reclassifications     (1,055)  
Amounts reclassified from AOCI, Credit loss related     2,153  
Other comprehensive income (loss)     1,098  
Ending Balance, June 30, 2021 (1,448)   (1,448)  
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Held-to-maturity Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2020     6  
OCI before reclassifications     0  
Amounts reclassified from AOCI, HTM related     (4)  
Other comprehensive income (loss)     (4)  
Ending Balance, June 30, 2021 2   2  
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2020     (85,064)  
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans     0  
Amount reclassified into net income: Net actuarial loss     1,095  
Ending Balance, June 30, 2021 (83,969)   (83,969)  
Accumulated other comprehensive income (loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance, December 31, 2020     220,186  
OCI before reclassifications     (54,582)  
Amounts reclassified from AOCI     3,767  
Other comprehensive income (loss) 34,771 $ 174,083 (50,815) $ 70,216
Ending Balance, June 30, 2021 $ 169,371   $ 169,371