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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, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 405,605 $ 505,142
Total other comprehensive income (loss), net of tax 10,115 (53,887)
Balance 422,823 446,846
Hedging Derivative Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 4,735 1,160
Other comprehensive (loss) income before reclassifications (663) 1,838
Total other comprehensive income (loss), net of tax (663) 1,838
Balance 4,072 2,998
Securities Available-For-Sale and Transferred Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (128,634) (4,971)
Other comprehensive (loss) income before reclassifications 10,620 (55,796)
Reclassification, Net of tax amount 14 23
Total other comprehensive income (loss), net of tax 10,634 (55,773)
Balance (118,000) (60,744)
Pension And Post-Retirement Obligations [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (13,588) (9,396)
Reclassification, Net of tax amount 144 48
Total other comprehensive income (loss), net of tax 144 48
Balance (13,444) (9,348)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (137,487) (13,207)
Other comprehensive (loss) income before reclassifications 9,957 (53,958)
Reclassification, Net of tax amount 158 71
Total other comprehensive income (loss), net of tax 10,115 (53,887)
Balance $ (127,372) $ (67,094)