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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCL (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss | $ (57,564) |  | $ (58,340) |  |  |
Net unrealized gain (loss) on AFS securities: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income, before tax: | (71,883) |  | (71,832) |  |  |
Income taxes related to items of accumulated other comprehensive income: | 16,576 |  | 16,586 |  |  |
Accumulated other comprehensive loss | (55,307) | $ (50,646) | (55,246) | $ (38,304) | $ (20,225) | $ 1,985
Net gain (loss) on effective cash flow hedging derivatives |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income, before tax: | (1,245) |  | (2,333) |  |  |
Income taxes related to items of accumulated other comprehensive income: | 288 |  | 539 |  |  |
Accumulated other comprehensive loss | (957) | (1,205) | (1,794) | (2,115) | (578) | 870
Net unrealized loss on post-retirement plans |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income, before tax: | (1,675) |  | (1,691) |  |  |
Income taxes related to items of accumulated other comprehensive income: | 375 |  | 391 |  |  |
Accumulated other comprehensive loss | $ (1,300) | $ (1,300) | $ (1,300) | $ (552) | $ (552) | $ (552)

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