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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)

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