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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Components and Related Income Tax Effects (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |  |  |
Unrealized holding gains (losses) on available for sale securities | $ 15,524 | $ (8,429) | $ (1,107)
Reclassification adjustments for (gains) losses realized in income | (201) | 7,921 | (38)
Income tax effect | (4,467) | 160 | 640
Net change in unrealized gains (losses) on available for sale securities | 10,856 | (348) | (505)
Unrealized net loss arising during the period | 1,076 | 1,567 | 302
Reclassification adjustments for amortization realized in income | 487 | 384 | 480
Income tax effect | 179 | 351 | 15
Net change in post-retirement obligation | (410) | (832) | 193
Change in fair value of derivatives used for cash flow hedges | (3,601) | 2,493 | 463
Reclassification adjustments for (gains) losses realized in income | (1,588) | (1,068) | 1,419
Income tax effect | 1,514 | (418) | (793)
Net change in unrealized (losses) gains on cash flow hedges | (3,675) | 1,007 | 1,089
Other comprehensive income (loss) | $ 6,771 | $ (173) | $ 777

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