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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance $ 448,045 $ 439,393 $ 438,947 $ 422,354 $ 408,253 $ 396,293 $ 438,947 $ 396,293
Other comprehensive income (loss) before reclassifications 401              
Amounts reclassified from accumulated other comprehensive income (loss) (114)     (854)     (202) (233)
Total other comprehensive income, net of tax 287 1,586 12,431 1,426 5,394 5,510 14,304 12,330
Balance 456,361 448,045 439,393 432,617 422,354 408,253 456,361 432,617
Hedging Derivative Instruments [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (815)   (518) (636)   (276) (518) (276)
Other comprehensive income (loss) before reclassifications 123     43     (174) (317)
Total other comprehensive income, net of tax 123     43     (174) (317)
Balance (692) (815)   (593) (636)   (692) (593)
Securities Available-For-Sale and Transferred Securities [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance 14,720   873 2,292   (7,769) 873 (7,769)
Other comprehensive income (loss) before reclassifications 278     2,237     14,680 12,880
Reclassification of income tax effects to retained earnings               (681)
Amounts reclassified from accumulated other comprehensive income (loss) (347)     (1,116)     (902) (1,017)
Total other comprehensive income, net of tax (69)     1,121     13,778 11,863
Balance 14,651 14,720   3,413 2,292   14,651 3,413
Pension And Post-Retirement Obligations [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (14,401)   (14,868) (14,816)   (13,236) (14,868) (13,236)
Reclassification of income tax effects to retained earnings               (2,102)
Amounts reclassified from accumulated other comprehensive income (loss) 233     262     700 784
Total other comprehensive income, net of tax 233     262     700 784
Balance (14,168) (14,401)   (14,554) (14,816)   (14,168) (14,554)
Accumulated Other Comprehensive Income (Loss) [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (496) (2,082) (14,513) (13,160) (18,554) (21,281) (14,513) (21,281)
Other comprehensive income (loss) before reclassifications 401     2,280     14,506 12,563
Reclassification of income tax effects to retained earnings               (2,783)
Amounts reclassified from accumulated other comprehensive income (loss) (114)     (854)     (202) (233)
Total other comprehensive income, net of tax 287 1,586 12,431 1,426 5,394 5,510 14,304 12,330
Balance $ (209) $ (496) $ (2,082) $ (11,734) $ (13,160) $ (18,554) $ (209) $ (11,734)