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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, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance $ 422,823 $ 405,605 $ 446,846 $ 505,142 $ 405,605 $ 505,142
Net current period other comprehensive income (loss) (7,100) 10,115 (32,631) (53,887) 3,015 (86,518)
Balance 425,873 422,823 425,801 446,846 425,873 425,801
Hedging Derivative Instruments [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance 4,072 4,735 2,998 1,160 4,735 1,160
Other comprehensive income (loss) before reclassifications 1,404   737   741 2,575
Net current period other comprehensive income (loss) 1,404   737   741 2,575
Balance 5,476 4,072 3,735 2,998 5,476 3,735
Securities Available-For-Sale and Transferred Securities [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance (118,000) (128,634) (60,744) (4,971) (128,634) (4,971)
Other comprehensive income (loss) before reclassifications (8,660)   (33,446)   1,960 (89,242)
Reclassification, Net of tax amount 12   31   26 54
Net current period other comprehensive income (loss) (8,648)   (33,415)   1,986 (89,188)
Balance (126,648) (118,000) (94,159) (60,744) (126,648) (94,159)
Pension And Post-Retirement Obligations [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance (13,444) (13,588) (9,348) (9,396) (13,588) (9,396)
Reclassification, Net of tax amount 144   47   288 95
Net current period other comprehensive income (loss) 144   47   288 95
Balance (13,300) (13,444) (9,301) (9,348) (13,300) (9,301)
Accumulated Other Comprehensive Income (Loss) [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance (127,372) (137,487) (67,094) (13,207) (137,487) (13,207)
Other comprehensive income (loss) before reclassifications (7,256)   (32,709)   2,701 (86,667)
Reclassification, Net of tax amount 156   78   314 149
Net current period other comprehensive income (loss) (7,100) 10,115 (32,631) (53,887) 3,015 (86,518)
Balance $ (134,472) $ (127,372) $ (99,725) $ (67,094) $ (134,472) $ (99,725)