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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 468,363 $ 438,947
Other comprehensive income before reclassifications (12,837) 12,327
Amounts reclassified from accumulated other comprehensive income (loss) 137 104
Total other comprehensive (loss) income, net of tax (12,700) 12,431
Balance 466,284 439,393
Hedging Derivative Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (316) (518)
Other comprehensive income before reclassifications 1,564 91
Total other comprehensive (loss) income, net of tax 1,564 91
Balance 1,248 (427)
Securities Available-For-Sale and Transferred Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 14,743 873
Other comprehensive income before reclassifications (14,401) 12,236
Amounts reclassified from accumulated other comprehensive income (loss) (1) (130)
Total other comprehensive (loss) income, net of tax (14,402) 12,106
Balance 341 12,979
Pension And Post-Retirement Obligations [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (12,299) (14,868)
Amounts reclassified from accumulated other comprehensive income (loss) 138 234
Total other comprehensive (loss) income, net of tax 138 234
Balance (12,161) (14,634)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 2,128 (14,513)
Total other comprehensive (loss) income, net of tax (12,700) 12,431
Balance $ (10,572) $ (2,082)