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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Components and Related Income Tax Effects (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |  |  |
Unrealized holding gains (losses) on available for sale securities | $ 9,069 | $ 15,524 | $ (8,429)
Reclassification adjustments for (gains) losses realized in income | (3,525) | (201) | 7,921
Income tax effect | (1,628) | (4,467) | 160
Net change in unrealized (losses) gains on available for sale securities | 3,916 | 10,856 | (348)
Unrealized net losses arising during the period | 3,245 | 1,076 | 1,567
Reclassification adjustments for amortization realized in income | 581 | 487 | 384
Income tax effect | 799 | 179 | 351
Net change in post-retirement obligation | (1,865) | (410) | (832)
Change in fair value of derivatives used for cash flow hedges | (10,455) | (3,601) | 2,493
Reclassification adjustments for losses (gains) realized in income | 5,016 | (1,588) | (1,068)
Income tax effect | 1,601 | 1,514 | (418)
Net change in unrealized (losses) gains on cash flow hedges | (3,838) | (3,675) | 1,007
Other comprehensive income (loss) | $ (1,787) | $ 6,771 | $ (173)

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