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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | $ 12,719 | $ (13,138) | $ 73,588 | $ (37,130) |  |  |  |
Unrealized gain (loss) on derivatives | 94 | 130 | 281 | 535 |  |  |  |
Retirement obligation | 0 | 0 | 0 | 0 |  |  |  |
Total | 12,813 | (13,008) | 73,869 | (36,595) |  |  |  |
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract] |  |  |  |  |  |  |  |
Realized gain (loss) on securities available-for-sale | 105 | (167) | (110) | (197) |  |  |  |
Unrealized gain (loss) on derivatives | 0 | 0 | 0 | 0 |  |  |  |
Retirement obligation | (347) | (452) | (1,042) | (1,323) |  |  |  |
Total | (242) | (619) | (1,152) | (1,520) |  |  |  |
Transactions Pre-tax |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | 12,614 | (12,971) | 73,698 | (36,933) |  |  |  |
Unrealized gain (loss) on derivatives | 94 | 130 | 281 | 535 |  |  |  |
Unfunded pension obligation | 347 | 452 | 1,042 | 1,323 |  |  |  |
Total | 13,055 | (12,389) | 75,021 | (35,075) |  |  |  |
Transactions Tax-effect |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | (2,699) | 2,786 | (15,768) | 7,940 |  |  |  |
Unrealized gain (loss) on derivatives | (21) | (31) | (64) | (121) |  |  |  |
Retirement obligation | (78) | (105) | (237) | (159) |  |  |  |
Total | (2,798) | 2,650 | (16,069) | 7,660 |  |  |  |
Transactions Net of tax |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | 9,915 | (10,185) | 57,930 | (28,993) |  |  |  |
Unrealized gain (loss) on derivatives | 73 | 99 | 217 | 414 |  |  |  |
Retirement obligation | 269 | 347 | 805 | 1,164 |  |  |  |
Total | 10,257 | (9,739) | 58,952 | (27,415) |  |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect |  |  |  | (5,092) |  |  |  |
Cumulative effect of new standard |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities |  |  | 906 | (189) |  |  |  |
Unrealized gain (loss) on Derivatives |  |  | 0 | (124) |  |  |  |
Retirement obligation |  |  | 0 | (4,779) |  |  |  |
Balances Net of tax |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | 47,235 | (29,364) | 47,235 | (29,364) | $ 37,320 | $ (11,601) | $ (19,179) | $ (182)
Unrealized gain (loss) on cash flow hedges | 0 | (287) | 0 | (287) | (73) | (217) | (386) | (577)
Retirement obligation | (31,785) | (23,246) | (31,785) | (23,246) | (32,054) | (32,590) | (23,593) | (19,631)
Total | 15,450 | (52,897) | 15,450 | (52,897) | $ 5,193 | $ (44,408) | $ (43,158) | $ (20,390)
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |
Transactions Net of tax |  |  |  |  |  |  |  |
Total | $ 10,257 | $ (9,739) | $ 58,952 | $ (27,415) |  |  |  |

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