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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss) | $ 877 | $ (11,802)
Net unrealized gain (loss) on AFS securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other accumulated comprehensive income (loss), before tax: | 7,242 | (11,304)
Income taxes related to items of accumulated other comprehensive (income) loss: | (1,693) | 2,641
Net unrealized loss on effective cash flow hedging derivatives |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other accumulated comprehensive income (loss), before tax: | (4,936) |
Income taxes related to items of accumulated other comprehensive (income) loss: | 1,154 |
Net unrealized loss on effective cash flow hedging derivatives |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other accumulated comprehensive income (loss), before tax: |  | (2,934)
Income taxes related to items of accumulated other comprehensive (income) loss: |  | 685
Net unrealized loss on post-retirement plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other accumulated comprehensive income (loss), before tax: | (1,162) | (1,162)
Income taxes related to items of accumulated other comprehensive (income) loss: | $ 272 | $ 272

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