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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications out of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassifications out of accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |
Interest expense | $ 4,492 | $ 5,589 | $ 5,418 | $ 7,952 | $ 8,672 | $ 9,639 | $ 10,835 | $ 10,192 | $ 23,451 | $ 39,338 | $ 32,204
Loss on termination of swaps |  |  |  |  |  |  |  |  | (3,403) |  |
Income tax benefit (expense) | (3,881) | (3,999) | (3,129) | (2,676) | (3,934) | (3,852) | (2,859) | (3,415) | (13,685) | (14,060) | (9,141)
Net income | $ 8,977 | $ 13,061 | $ 10,656 | $ 9,348 | $ 14,208 | $ 13,903 | $ 10,653 | $ 12,927 | 42,042 | 51,691 | 39,227
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income |  |  |  |  |  |  |  |  |  |  |
Reclassifications out of accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |
Total reclassifications, before income tax |  |  |  |  |  |  |  |  | (2,072) | 1,302 | (7,237)
Net income |  |  |  |  |  |  |  |  | (1,466) | 922 | (5,132)
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Loss on termination of swaps |  |  |  |  |  |  |  |  |  |  |
Reclassifications out of accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |
Loss on termination of swaps |  |  |  |  |  |  |  |  | (3,365) |  |
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Income tax expense |  |  |  |  |  |  |  |  |  |  |
Reclassifications out of accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |
Income tax benefit (expense) |  |  |  |  |  |  |  |  | 606 | (380) | 2,105
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Realized gains (losses) on sale of available for sale securities | Net securities gains (losses) |  |  |  |  |  |  |  |  |  |  |
Reclassifications out of accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |
Net securities gains |  |  |  |  |  |  |  |  | 3,525 | 201 | (7,921)
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Prior service credit | Other operating expenses |  |  |  |  |  |  |  |  |  |  |
Reclassifications out of accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 77 | 77 | 77
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Transition obligation | Other operating expenses |  |  |  |  |  |  |  |  |  |  |
Reclassifications out of accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  |  |  | (5)
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Actuarial losses | Other operating expenses |  |  |  |  |  |  |  |  |  |  |
Reclassifications out of accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | (658) | (564) | (456)
Amount Reclassified from Accumulated Other Comprehensiven (loss) Income | Realized (losses) gains on cash flow hedges | Interest expense. |  |  |  |  |  |  |  |  |  |  |
Reclassifications out of accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ (1,651) | $ 1,588 | $ 1,068

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