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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Net unrealized gains on available-for-sale securities, beginning balance | $ 11,801 | $ 22,180 | $ 29,310 | $ 3,250
Net unrealized losses on cash flow hedging derivative instruments, beginning balance | 538 | (6,802) | (4,626) | (6,048)
Net unrecognized gains on postretirement plans, beginning balance | (3,774) | (3,337) | (3,944) | (3,470)
Accumulated other comprehensive (income) loss, beginning balance | 8,565 | 12,041 | 20,740 | (6,268)
Net Unrealized Gains (Losses) on AFS Securities |  |  |  |
Other comprehensive income (loss) before reclassifications | 2,296 | 7,130 | (15,213) | 26,060
Less: Amounts reclassified from AOCI | 0 | 0 | 0 | 0
Other comprehensive income (loss) | 2,296 | 7,130 | (15,213) | 26,060
Net Unrealized Losses on Cash Flow Hedges |  |  |  |
Other comprehensive income (loss) before reclassifications | (2,514) | 31 | 2,504 | (871)
Less: Amounts reclassified from AOCI | (150) | (21) | (296) | (169)
Other comprehensive income (loss) | (2,364) | 52 | 2,800 | (702)
Defined Benefit Postretirement Plans |  |  |  |
Other comprehensive income (loss) before reclassifications | 175 | 137 | 350 | 275
Less: Amounts reclassified from AOCI | 4 | 4 | 9 | 9
Other comprehensive income (loss) | 171 | 133 | 341 | 266
Accumulated other comprehensive Income (Loss) |  |  |  |
Other comprehensive income (loss) before reclassification | (43) | 7,298 | (12,359) | 25,464
Less: Amounts reclassified from AOCI | (146) | (17) | (287) | (160)
Other Comprehensive Income (Loss) | 103 | 7,315 | (12,072) | 25,624
Net unrealized gains on available-for-sale securities, ending balance | 14,097 | 29,310 | 14,097 | 29,310
Net unrealized losses on cash flow hedging derivative instruments, ending balance | (1,826) | (6,750) | (1,826) | (6,750)
Net unrecognized gains on postretirement plans, ending balance | (3,603) | (3,204) | (3,603) | (3,204)
Accumulated other comprehensive (income) loss, ending balance | $ 8,668 | $ 19,356 | $ 8,668 | $ 19,356

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