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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | $ 31,144 | $ (11,456) | $ 60,869 | $ (23,992) |  |  |  |
Unrealized gain (loss) on derivatives | 94 | 203 | 187 | 405 |  |  |  |
Retirement obligation | 0 | 0 | 0 | 0 |  |  |  |
Total | 31,238 | (11,253) | 61,056 | (23,587) |  |  |  |
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract] |  |  |  |  |  |  |  |
Realized gain (loss) on securities available-for-sale | (37) | (30) | (215) | (30) |  |  |  |
Unrealized gain (loss) on derivatives | 0 | 0 | 0 | 0 |  |  |  |
Retirement obligation | (320) | (452) | (695) | (871) |  |  |  |
Total | (357) | (482) | (910) | (901) |  |  |  |
Transactions Pre-tax |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | 31,181 | (11,426) | 61,084 | (23,962) |  |  |  |
Unrealized gain (loss) on derivatives | 94 | 203 | 187 | 405 |  |  |  |
Unfunded pension obligation | 320 | 452 | 695 | 871 |  |  |  |
Total | 31,595 | (10,771) | 61,966 | (22,686) |  |  |  |
Transactions Tax-effect |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | (6,671) | 2,448 | (13,069) | 5,154 |  |  |  |
Unrealized gain (loss) on derivatives | (22) | (44) | (43) | (90) |  |  |  |
Retirement obligation | (74) | 42 | (159) | (54) |  |  |  |
Total | (6,767) | 2,446 | (13,271) | 5,010 |  |  |  |
Transactions Net of tax |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | 24,510 | (8,978) | 48,015 | (18,808) |  |  |  |
Unrealized gain (loss) on derivatives | 72 | 159 | 144 | 315 |  |  |  |
Retirement obligation | 246 | 494 | 536 | 817 |  |  |  |
Total | 24,828 | (8,325) | 48,695 | (17,676) |  |  |  |
Cumulative effect of new standard |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities |  |  | 906 | (190) |  |  |  |
Unrealized gain (loss) on Derivatives |  |  | 0 | (124) |  |  |  |
Retirement obligation |  |  | 0 | (4,779) |  |  |  |
Total |  |  | 906 | (5,093) |  |  |  |
Balances Net of tax |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment securities | 37,320 | (19,180) | 37,320 | (19,180) | $ 12,810 | $ (11,601) | $ (10,202) | $ (182)
Unrealized gain (loss) on cash flow hedges | (73) | (386) | (73) | (386) | (145) | (217) | (545) | (577)
Retirement obligation | (32,054) | (23,593) | (32,054) | (23,593) | (32,300) | (32,590) | (24,087) | (19,631)
Total | 5,193 | (43,159) | 5,193 | (43,159) | $ (19,635) | $ (44,408) | $ (34,834) | $ (20,390)
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |
Transactions Net of tax |  |  |  |  |  |  |  |
Total | $ 24,828 | $ (8,325) | $ 48,695 | $ (17,676) |  |  |  |

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