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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income | $ (21,355) | $ 2,303 |  |
Net unrealized gain (loss) on AFS securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income, before tax: | (26,264) | 2,580 |  |
Income taxes related to items of accumulated other comprehensive income: | 6,039 | (595) |  |
Accumulated other comprehensive income | (20,225) | 1,985 | $ 4,508 | $ 10,021
Net unrealized gain (loss) on hedging derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income, before tax: | (751) | 1,130 |  |
Income taxes related to items of accumulated other comprehensive income: | 173 | (260) |  |
Accumulated other comprehensive income | (578) | 870 | (787) | (2,623)
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) | $ (1,418) | $ (1,418)

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