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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)

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