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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME. |  |  |  |
Unrealized holding gains (losses) on available for sale securities | $ 2,227 | $ (4,319) | $ 16,247 | $ (17,137)
Reclassification adjustment for losses (gains) realized in income |  |  | (201) | 7,921
Income tax effect | (649) | 1,256 | (4,679) | 2,681
Net change in unrealized gains (losses) on available for sale securities | 1,578 | (3,063) | 11,367 | (6,535)
Reclassification adjustment for amortization realized in income | 128 | 94 | 385 | 284
Income tax effect | (37) | (27) | (113) | (82)
Net change in post-retirement obligation | 91 | 67 | 272 | 202
Change in fair value of derivatives used for cash flow hedges | (657) | 584 | (5,360) | 4,431
Reclassification adjustment for gains realized in income | (331) | (374) | (1,353) | (653)
Income tax effect | 288 | (61) | 1,958 | (1,099)
Net change in unrealized (losses) gains on cash flow hedges | (700) | 149 | (4,755) | 2,679
Other comprehensive income (loss) | $ 969 | $ (2,847) | $ 6,884 | $ (3,654)

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