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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income (loss) | $ 9,405 |  | $ 3,911 | $ 3,045 |  | $ (11,802)
Net unrealized gain (loss) on AFS securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other accumulated comprehensive income (loss), before tax: | 15,264 |  | 7,342 |  |  |
Income taxes related to items of accumulated other comprehensive (income) loss: | (3,583) |  | (1,793) |  |  |
Accumulated other comprehensive income (loss) | 11,681 | $ 11,412 | 5,550 | 8,000 | $ 5,547 | (8,665)
Net unrealized gain (loss) on effective cash flow hedging derivatives |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other accumulated comprehensive income (loss), before tax: | (1,461) |  | (718) |  |  |
Income taxes related to items of accumulated other comprehensive (income) loss: | 342 |  | 237 |  |  |
Accumulated other comprehensive income (loss) | (1,119) | (1,734) | (482) | (4,067) | (3,782) | (2,249)
Net unrealized gain (loss) on post-retirement plans |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other accumulated comprehensive income (loss), before tax: | (1,512) |  | (1,512) |  |  |
Income taxes related to items of accumulated other comprehensive (income) loss: | 355 |  | 355 |  |  |
Accumulated other comprehensive income (loss) | $ (1,157) | $ (1,157) | $ (1,157) | $ (888) | $ (888) | $ (888)

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