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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income | $ (62,589) |  | $ 2,303 |  |  |
Net unrealized gain (loss) on AFS securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income, before tax: | (76,606) |  | 2,580 |  |  |
Income taxes related to items of accumulated other comprehensive income: | 17,891 |  | (595) |  |  |
Accumulated other comprehensive income | (58,715) | $ (38,304) | 1,985 | $ 4,398 | $ 7,237 | $ 10,023
Net unrealized gain (loss) on hedging derivatives |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income, before tax: | (4,316) |  | 1,130 |  |  |
Income taxes related to items of accumulated other comprehensive income: | 994 |  | (260) |  |  |
Accumulated other comprehensive income | (3,322) | (2,115) | 870 | (92) | 63 | (1,865)
Net unrealized gain (loss) on post-retirement plans |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income, before tax: | (718) |  | (718) |  |  |
Income taxes related to items of accumulated other comprehensive income: | 166 |  | 166 |  |  |
Accumulated other comprehensive income | $ (552) | $ (552) | $ (552) | $ (1,418) | $ (1,418) | $ (1,418)

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