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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCLI (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (52,568) | $ (49,862) |  |
Net unrealized gain (loss) on AFS securities: |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss, before tax: | (64,948) | (62,351) |  |
Income taxes related to items of accumulated other comprehensive loss: | 15,315 | 14,702 |  |
Accumulated other comprehensive loss | (49,633) | (47,649) | $ (50,646) | $ (55,246)
Net unrealized gain (loss) on hedging derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss, before tax: | (2,259) | (1,322) |  |
Income taxes related to items of accumulated other comprehensive loss: | 533 | 312 |  |
Accumulated other comprehensive loss | (1,726) | (1,010) | (1,205) | (1,794)
Net unrealized gain (loss) on post-retirement plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss, before tax: | (1,518) | (1,540) |  |
Income taxes related to items of accumulated other comprehensive loss: | 309 | 337 |  |
Accumulated other comprehensive loss | $ (1,209) | $ (1,203) | $ (1,300) | $ (1,300)

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