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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 438,947 $ 396,293 $ 381,177
Other comprehensive income (loss) before reclassifications 16,660 9,374 (10,275)
Amounts reclassified from accumulated other comprehensive income (loss) (19) 177 910
Total other comprehensive income (loss), net of tax 16,641 9,551 (9,365)
Balance 468,363 438,947 396,293
Hedging Derivative Instruments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (518) (276)  
Other comprehensive income (loss) before reclassifications 202 (242) (276)
Total other comprehensive income (loss), net of tax 202 (242) (276)
Balance (316) (518) (276)
Securities Available-For-Sale and Transferred Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 873 (7,769) (3,275)
Reclassification adjustment for net gains included in net income   (681)  
Other comprehensive income (loss) before reclassifications 14,822 10,192 (4,897)
Amounts reclassified from accumulated other comprehensive income (loss) (952) (869) 403
Total other comprehensive income (loss), net of tax 13,870 9,323 (4,494)
Balance 14,743 873 (7,769)
Pension And Post-Retirement Obligations [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (14,868) (13,236) (8,641)
Reclassification adjustment for net gains included in net income   (2,102)  
Other comprehensive income (loss) before reclassifications 1,636 (576) (5,102)
Amounts reclassified from accumulated other comprehensive income (loss) 933 1,046 507
Total other comprehensive income (loss), net of tax 2,569 470 (4,595)
Balance (12,299) (14,868) (13,236)
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (14,513) (21,281) (11,916)
Reclassification adjustment for net gains included in net income   (2,783)  
Total other comprehensive income (loss), net of tax 16,641 9,551 (9,365)
Balance $ 2,128 $ (14,513) $ (21,281)