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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Components and Related Income Tax Effects (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME. |  |  |  |
Unrealized holding gains (losses) on available for sale securities | $ 8,489 | $ (4,231) | $ 14,020 | $ (12,818)
Reclassification adjustment for losses (gains) realized in income | (201) | 7,921 | (201) | 7,921
Income tax effect | (2,417) | (1,074) | (4,030) | 1,425
Net change in unrealized gains (losses) on available for sale securities | 5,871 | 2,616 | 9,789 | (3,472)
Reclassification adjustment for amortization realized in income | 129 | 95 | 257 | 190
Income tax effect | (38) | (27) | (76) | (55)
Net change in post-retirement obligation | 91 | 68 | 181 | 135
Change in fair value of derivatives used for cash flow hedges | (3,106) | 1,020 | (4,703) | 3,847
Reclassification adjustment for gains realized in income | (466) | (344) | (1,022) | (279)
Income tax effect | 1,042 | (197) | 1,670 | (1,038)
Net change in unrealized (losses) gains on cash flow hedges | (2,530) | 479 | (4,055) | 2,530
Other comprehensive income (loss) | $ 3,432 | $ 3,163 | $ 5,915 | $ (807)

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