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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance $ 466,284 $ 468,363 $ 439,393 $ 438,947 $ 468,363 $ 438,947
Other comprehensive income (loss) before reclassifications 4,453   1,778   (8,384) 14,105
Amounts reclassified from accumulated other comprehensive income (loss) 185   (192)   322 (88)
Total other comprehensive income (loss), net of tax 4,638 (12,700) 1,586 12,431 (8,062) 14,017
Balance 487,126 466,284 448,045 439,393 487,126 448,045
Hedging Derivative Instruments [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance 1,248 (316) (427) (518) (316) (518)
Other comprehensive income (loss) before reclassifications (501)   (388)   1,063 (297)
Total other comprehensive income (loss), net of tax (501)   (388)   1,063 (297)
Balance 747 1,248 (815) (427) 747 (815)
Securities Available-For-Sale and Transferred Securities [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance 341 14,743 12,979 873 14,743 873
Other comprehensive income (loss) before reclassifications 4,954   2,166   (9,447) 14,402
Amounts reclassified from accumulated other comprehensive income (loss) 48   (425)   47 (555)
Total other comprehensive income (loss), net of tax 5,002   1,741   (9,400) 13,847
Balance 5,343 341 14,720 12,979 5,343 14,720
Pension And Post-Retirement Obligations [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance (12,161) (12,299) (14,634) (14,868) (12,299) (14,868)
Amounts reclassified from accumulated other comprehensive income (loss) 137   233   275 467
Total other comprehensive income (loss), net of tax 137   233   275 467
Balance (12,024) (12,161) (14,401) (14,634) (12,024) (14,401)
Accumulated Other Comprehensive Income (Loss) [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance (10,572) 2,128 (2,082) (14,513) 2,128 (14,513)
Total other comprehensive income (loss), net of tax 4,638 (12,700) 1,586 12,431    
Balance $ (5,934) $ (10,572) $ (496) $ (2,082) $ (5,934) $ (496)