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OTHER COMPREHENSIVE INCOME (LOSS) Accumulated Other Comprehensive Income (Loss) (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 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 | $ (586) | $ 3,573 | 25,474 | 25,332
Less: Amounts reclassified from AOCI |  |  | 0 | 22
Other comprehensive income (loss) | (586) | 3,572 | 25,474 | 25,310
Net Unrealized Losses on Cash Flow Hedges |  |  |  |
Other comprehensive income (loss) before reclassifications | 540 | (310) | (328) | (2,438)
Less: Amounts reclassified from AOCI |  |  | (298) | (520)
Other comprehensive income (loss) | 672 | (41) | (30) | (1,918)
Defined Benefit Postretirement Plans |  |  |  |
Other comprehensive income (loss) before reclassifications | 138 | 54 | 413 | 159
Less: Amounts reclassified from AOCI |  |  | 14 | 14
Other comprehensive income (loss) | 133 | 49 | 399 | 145
Accumulated other comprehensive Income (Loss) |  |  |  |
Other comprehensive income (loss) before reclassification |  |  | 25,559 | 23,053
Less: Amounts reclassified from AOCI |  |  | (284) | (484)
Other Comprehensive Income (Loss) | 219 | 3,580 | 25,843 | 23,537
Net unrealized gains on available-for-sale securities, ending balance | 28,724 | 7,484 | 28,724 | 7,484
Net unrealized losses on cash flow hedging derivative instruments, ending balance | (6,078) | (6,355) | (6,078) | (6,355)
Net unrecognized gains on postretirement plans, ending balance | (3,071) | (2,012) | (3,071) | (2,012)
Accumulated other comprehensive (income) loss, ending balance | $ 19,575 | $ (883) | $ 19,575 | $ (883)

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- Definition Other Comprehensive (Income) Loss, Defined Benefit Plan, Net Actuarial Gains (Losses), after Tax + References No definition available. + Details
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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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