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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Components of AOCL (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (49,862) | $ (58,340) |  |
Net unrealized gain (loss) on AFS securities: |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss, before tax: | (62,351) | (71,832) |  |
Income taxes related to items of accumulated other comprehensive loss: | 14,702 | 16,586 |  |
Accumulated other comprehensive loss | (47,649) | (55,246) | $ 1,985 | $ 10,023
Net unrealized gain (loss) on hedging derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss, before tax: | (1,322) | (2,333) |  |
Income taxes related to items of accumulated other comprehensive loss: | 312 | 539 |  |
Accumulated other comprehensive loss | (1,010) | (1,794) | 870 | (1,865)
Net unrealized gain (loss) on post-retirement plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss, before tax: | (1,540) | (1,691) |  |
Income taxes related to items of accumulated other comprehensive loss: | 337 | 391 |  |
Accumulated other comprehensive loss | $ (1,203) | $ (1,300) | $ (552) | $ (1,418)

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