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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 396,293 $ 381,177 $ 320,054
Other comprehensive income (loss) before reclassifications 9,374 (10,275) 2,028
Amounts reclassified from accumulated other comprehensive income (loss) 177 910 7
Total other comprehensive income (loss), net of tax 9,551 (9,365) 2,035
Balance 438,947 396,293 381,177
Hedging Derivative Instruments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (276)    
Other comprehensive income (loss) before reclassifications (242) (276)  
Total other comprehensive income (loss), net of tax (242) (276)  
Balance (518) (276)  
Securities Available-For-Sale and Transferred Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (7,769) (3,275) (3,729)
Reclassification adjustment for net gains included in net income (681)    
Other comprehensive income (loss) before reclassifications 10,192 (4,897) 1,131
Amounts reclassified from accumulated other comprehensive income (loss) (869) 403 (677)
Total other comprehensive income (loss), net of tax 9,323 (4,494) 454
Balance 873 (7,769) (3,275)
Pension And Post-Retirement Obligations [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (13,236) (8,641) (10,222)
Reclassification adjustment for net gains included in net income (2,102)    
Other comprehensive income (loss) before reclassifications (576) (5,102) 897
Amounts reclassified from accumulated other comprehensive income (loss) 1,046 507 684
Total other comprehensive income (loss), net of tax 470 (4,595) 1,581
Balance (14,868) (13,236) (8,641)
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (21,281) (11,916) (13,951)
Reclassification adjustment for net gains included in net income (2,783)    
Total other comprehensive income (loss), net of tax 9,551 (9,365) 2,035
Balance $ (14,513) $ (21,281) $ (11,916)