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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Components and Related Income Tax Effects (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME |  |  |  |
Unrealized holding (losses) gains on available for sale securities | $ (935) | $ 2,227 | $ 9,186 | $ 16,247
Reclassification adjustments for gains realized in income | (3,540) |  | (3,525) | (201)
Income tax effect | 1,309 | (649) | (1,655) | (4,679)
Net change in unrealized (losses) gains on available for sale securities | (3,166) | 1,578 | 4,006 | 11,367
Reclassification adjustments for amortization realized in income | 136 | 128 | 412 | 385
Income tax effect | (39) | (37) | (120) | (113)
Net change in post-retirement obligation | 97 | 91 | 292 | 272
Change in fair value of derivatives used for cash flow hedges | 3,364 | (657) | (7,709) | (5,360)
Reclassification adjustments for losses (gains) realized in income | 992 | (331) | 1,058 | (1,353)
Income tax effect | (1,274) | 288 | 1,945 | 1,958
Net change in unrealized gains (losses) on cash flow hedges | 3,082 | (700) | (4,706) | (4,755)
Other comprehensive income (loss) | $ 13 | $ 969 | $ (408) | $ 6,884

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