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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract] |  |  |  |
Unrealized gain (loss) on investment securities | $ (2,434) | $ 29,725 |  |
Unrealized gain (loss) on derivatives |  | 93 |  |
Retirement obligation | 0 | 0 |  |
Total | (2,434) | 29,818 |  |
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract] |  |  |  |
Realized gain (loss) on securities available-for-sale | (59) | (178) |  |
Unrealized gain (loss) on derivatives |  | 0 |  |
Retirement obligation | (425) | (375) |  |
Total | (484) | (553) |  |
Transactions Pre-tax |  |  |  |
Unrealized gain (loss) on investment securities | (2,375) | 29,903 |  |
Unrealized gain (loss) on derivatives |  | 93 |  |
Unfunded pension obligation | 425 | 375 |  |
Total | (1,950) | 30,371 |  |
Transactions Tax-effect |  |  |  |
Unrealized gain (loss) on investment securities | 512 | (6,398) |  |
Unrealized gain (loss) on derivatives |  | (21) |  |
Retirement obligation | (97) | (85) |  |
Total | 415 | (6,504) |  |
Transactions Net of tax |  |  |  |
Unrealized gain (loss) on investment securities | (1,863) | 23,505 |  |
Unrealized gain (loss) on derivatives | 0 | 72 |  |
Retirement obligation | 328 | 290 |  |
Total | (1,535) | 23,867 |  |
Cumulative effect of new standard |  |  |  |
Unrealized gain (loss) on investment securities |  | 906 |  |
Unrealized gain (loss) on Derivatives |  | 0 |  |
Retirement obligation |  | 0 |  |
Total |  | 906 |  |
Balances Net of tax |  |  |  |
Unrealized gain (loss) on investment securities | 39,401 | 12,810 | $ 41,264 | $ (11,601)
Unrealized gain (loss) on cash flow hedges |  | (145) |  | (217)
Retirement obligation | (27,613) | (32,300) | (27,941) | (32,590)
Total | 11,788 | (19,635) | $ 13,323 | $ (44,408)
Accumulated other comprehensive income (loss) |  |  |  |
Transactions Net of tax |  |  |  |
Total | $ (1,535) | $ 23,867 |  |

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