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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | $ (13,138) | $ 2,612 | $ (37,130) | $ 12,614 |  |  |  |
Unrealized gain (loss) on derivatives | 130 | 202 | 535 | 607 |  |  |  |
Retirement obligation | 0 | 0 | 0 | 0 |  |  |  |
Total | (13,008) | 2,814 | (36,595) | 13,221 |  |  |  |
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | (167) | 276 | (197) | 1,630 |  |  |  |
Unrealized gain (loss) on derivatives | 0 | 0 | 0 | 0 |  |  |  |
Retirement obligation | (452) | (335) | (1,323) | (1,005) |  |  |  |
Total | (619) | (59) | (1,520) | 625 |  |  |  |
Transactions Pre-tax |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | (12,971) | 2,336 | (36,933) | 10,984 |  |  |  |
Unrealized gain (loss) on derivatives | 130 | 202 | 535 | 607 |  |  |  |
Unfunded pension obligation | 452 | 335 | 1,323 | 1,005 |  |  |  |
Total | (12,389) | 2,873 | (35,075) | 12,596 |  |  |  |
Transactions Tax-effect |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | 2,786 | (835) | 7,940 | (3,920) |  |  |  |
Unrealized gain (loss) on derivatives | (31) | (73) | (121) | (222) |  |  |  |
Retirement obligation | (105) | (122) | (159) | (390) |  |  |  |
Total | 2,650 | (1,030) | 7,660 | (4,532) |  |  |  |
Transactions Net of tax |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | (10,185) | 1,501 | (28,993) | 7,064 |  |  |  |
Unrealized gain (loss) on derivatives | 99 | 129 | 414 | 385 |  |  |  |
Retirement obligation | 347 | 213 | 1,164 | 615 |  |  |  |
Total | (9,739) | 1,843 | (27,415) | 8,064 |  |  |  |
Stranded Tax Effects |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities |  |  | (189) |  |  |  |  |
Unrealized gain (loss) on Derivatives |  |  | (124) |  |  |  |  |
Retirement obligation |  |  | (4,779) |  |  |  |  |
Total |  |  | (5,092) |  |  |  |  |
Balances Net of tax |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | (29,364) | 2,515 | (29,364) | 2,515 | $ (19,179) | $ (182) | $ 1,014 | $ (4,549)
Unrealized gain (loss) on cash flow hedges | (287) | (706) | (287) | (706) | (386) | (577) | (835) | (1,091)
Retirement obligation | (23,246) | (22,188) | (23,246) | (22,188) | (23,593) | (19,631) | (22,401) | (22,803)
Total | $ (52,897) | $ (20,379) | (52,897) | (20,379) | $ (43,158) | $ (20,390) | $ (22,222) | $ (28,443)
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |
Transactions Net of tax |  |  |  |  |  |  |  |
Total |  |  | $ (27,415) | $ 8,064 |  |  |  |

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