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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract] |  |  |  |
Unrealized gain (loss) on investment securities | $ (12,536) | $ 2,832 |  |
Unrealized gain (loss) on derivatives | 202 | 203 |  |
Retirement obligation | 0 | 0 |  |
Total | (12,334) | 3,035 |  |
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract] |  |  |  |
Unrealized gain (loss) on investment securities | 0 | 516 |  |
Unrealized gain (loss) on derivatives | 0 | 0 |  |
Retirement obligation | (419) | (335) |  |
Total | (419) | 181 |  |
Transactions Pre-tax |  |  |  |
Unrealized gain (loss) on investment securities | (12,536) | 2,316 |  |
Unrealized gain (loss) on derivatives | 202 | 203 |  |
Unfunded pension obligation | 419 | 335 |  |
Total | (11,915) | 2,854 |  |
Transactions Tax-effect |  |  |  |
Unrealized gain (loss) on investment securities | 2,706 | (829) |  |
Unrealized gain (loss) on derivatives | (46) | (75) |  |
Retirement obligation | (96) | (146) |  |
Total | 2,564 | (1,050) |  |
Transactions Net of tax |  |  |  |
Unrealized gain (loss) on investment securities | (9,830) | 1,487 |  |
Unrealized gain (loss) on derivatives | 156 | 128 |  |
Retirement obligation | 323 | 189 |  |
Total | (9,351) | 1,804 |  |
Stranded Tax Effects |  |  |  |
Unrealized gain (loss) on investment securities | (39) |  |  |
Unrealized gain (loss) on Derivatives | (124) |  |  |
Retirement obligation | 4,779 |  |  |
Total | (4,942) |  |  |
Balances Net of tax |  |  |  |
Unrealized gain (loss) on investment securities | (10,051) | (3,062) | $ (182) | $ (4,549)
Unrealized gain (loss) on cash flow hedges | (545) | (963) | (577) | (1,091)
Retirement obligation | (24,087) | (22,614) | (19,631) | (22,803)
Total | (34,683) | (26,639) | $ (20,390) | $ (28,443)
Accumulated other comprehensive income (loss) |  |  |  |
Transactions Net of tax |  |  |  |
Total | $ (9,351) | $ 1,804 |  |

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