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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance $ 425,873 $ 422,823 $ 405,605 $ 425,801 $ 446,846 $ 505,142 $ 405,605 $ 505,142
Net current period other comprehensive income (loss) (26,917) (7,100) 10,115 (41,458) (32,631) (53,887) (23,902) (127,976)
Balance 408,716 425,873 422,823 394,048 425,801 446,846 408,716 394,048
Hedging Derivative Instruments [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance 5,476   4,735 3,735   1,160 4,735 1,160
Other comprehensive income (loss) before reclassifications 385     1,360     1,126 3,935
Net current period other comprehensive income (loss) 385     1,360     1,126 3,935
Balance 5,861 5,476   5,095 3,735   5,861 5,095
Securities Available-For-Sale and Transferred Securities [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (126,648)   (128,634) (94,159)   (4,971) (128,634) (4,971)
Other comprehensive income (loss) before reclassifications (27,457)     (42,882)     (25,497) (132,124)
Reclassification, Net of tax amount 12     16     38 70
Net current period other comprehensive income (loss) (27,445)     (42,866)     (25,459) (132,054)
Balance (154,093) (126,648)   (137,025) (94,159)   (154,093) (137,025)
Pension And Post-Retirement Obligations [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (13,300)   (13,588) (9,301)   (9,396) (13,588) (9,396)
Reclassification, Net of tax amount 143     48     431 143
Net current period other comprehensive income (loss) 143     48     431 143
Balance (13,157) (13,300)   (9,253) (9,301)   (13,157) (9,253)
Accumulated Other Comprehensive Income (Loss) [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (134,472) (127,372) (137,487) (99,725) (67,094) (13,207) (137,487) (13,207)
Other comprehensive income (loss) before reclassifications (27,072)     (41,522)     (24,371) (128,189)
Reclassification, Net of tax amount 155     64     469 213
Net current period other comprehensive income (loss) (26,917) (7,100) 10,115 (41,458) (32,631) (53,887) (23,902) (127,976)
Balance $ (161,389) $ (134,472) $ (127,372) $ (141,183) $ (99,725) $ (67,094) $ (161,389) $ (141,183)