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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, 2022
Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 505,142 $ 468,363
Total other comprehensive loss, net of tax (53,887) (12,700)
Balance 446,846 466,284
Hedging Derivative Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 1,160 (316)
Other comprehensive income (loss) before reclassifications (1,838) 1,564
Total other comprehensive loss, net of tax (1,838) 1,564
Balance 2,998 1,248
Securities Available-For-Sale and Transferred Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 4,971 14,743
Other comprehensive income (loss) before reclassifications 55,796 (14,401)
Reclassification, Net of tax amount 23 (1)
Total other comprehensive loss, net of tax 55,773 (14,402)
Balance 60,744 341
Pension And Post-Retirement Obligations [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (9,396) (12,299)
Reclassification, Net of tax amount 48 138
Total other comprehensive loss, net of tax 48 138
Balance (9,348) (12,161)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (13,207) 2,128
Other comprehensive income (loss) before reclassifications (53,958) (12,837)
Reclassification, Net of tax amount 71 137
Total other comprehensive loss, net of tax (53,887) (12,700)
Balance $ (67,094) $ (10,572)