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OTHER COMPREHENSIVE INCOME (LOSS) Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Net unrealized gains on available-for-sale securities, beginning balance |  |  | $ 3,250 | $ (17,826)
Net unrealized losses on cash flow hedging derivative instruments, beginning balance |  |  | (6,048) | (4,437)
Net unrecognized gains on postretirement plans, beginning balance |  |  | (3,470) | (2,157)
Accumulated other comprehensive (income) loss, beginning balance |  |  | (6,268) | (24,420)
Net Unrealized Gains (Losses) on AFS Securities |  |  |  |
Other comprehensive income (loss) before reclassifications | $ 7,130 | $ 10,860 | 26,060 | 21,759
Less: Amounts reclassified from AOCI |  |  | 0 | 21
Other comprehensive income (loss) | 7,130 | 10,839 | 26,060 | 21,738
Net Unrealized Losses on Cash Flow Hedges |  |  |  |
Other comprehensive income (loss) before reclassifications | (11) | (1,203) | (912) | (2,128)
Less: Amounts reclassified from AOCI |  |  | (210) | (251)
Other comprehensive income (loss) | 52 | (1,046) | (702) | (1,877)
Defined Benefit Postretirement Plans |  |  |  |
Other comprehensive income (loss) before reclassifications | 138 | 52 | 275 | 105
Less: Amounts reclassified from AOCI |  |  | 9 | 9
Other comprehensive income (loss) | 133 | 48 | 266 | 96
Accumulated other comprehensive Income (Loss) |  |  |  |
Other comprehensive income (loss) before reclassification |  |  | 25,423 | 19,736
Less: Amounts reclassified from AOCI |  |  | (201) | (221)
Other Comprehensive Income (Loss) | 7,315 | 9,841 | 25,624 | 19,957
Net unrealized gains on available-for-sale securities, ending balance | 29,310 | 3,912 | 29,310 | 3,912
Net unrealized losses on cash flow hedging derivative instruments, ending balance | (6,750) | (6,314) | (6,750) | (6,314)
Net unrecognized gains on postretirement plans, ending balance | (3,204) | (2,061) | (3,204) | (2,061)
Accumulated other comprehensive (income) loss, ending balance | $ 19,356 | $ (4,463) | $ 19,356 | $ (4,463)

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