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OTHER COMPREHENSIVE INCOME (LOSS) - tax effects for each component (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investment Securities Before Tax Amount [Abstract] |  |  |
Change in net unrealized gain/loss on securities available for sale before tax | $ 2,437 | $ 3,790 | $ (409)
Amortization of unrealized losses on securities transferred from available for sale to held to maturity before tax | 36 | 43 | 55
Total Investment Securities | 2,473 | 3,833 | (354)
Change in net unrealized gain (loss) on effective cash flow derivative, before tax | 574 | 0 | 0
Benefit Plans: |  |  |
Reclassification adjustment for amortization of prior service cost | (880) | 15 | 199
Reclassification adjustment for amortization of net loss | 4,391 | 4,623 | 5,299
Current year actuarial (loss) gain | (27,924) | (7,642) | (815)
Total Benefit Plans | (24,413) | (3,004) | 4,683
Total Other Comprehensive Loss Before Tax | (21,366) | 829 | 4,329
Investment Securities Tax Expense (Benefit) [Abstract] |  |  |
Change in net unrealized gain/loss on securities available for sale tax | (628) | (950) | 103
Amortization of unrealized losses on securities transferred from available for sale to held to maturity tax expense (benefit) | (9) | (11) | (14)
Total Investment Securities, tax | (637) | (961) | 89
Change in net unrealized gain (loss) on effective cash flow derivative, tax | (146) |  |
Benefit Plans: |  |  |
Reclassification adjustment for amortization of prior service cost | 223 | (4) | (50)
Reclassification adjustment for amortization of net loss | (1,113) | (1,170) | (1,346)
Current year actuarial gain (loss) | 7,078 | 1,940 | 207
Total Benefit Plans | 6,188 | 766 | (1,189)
Total Other Comprehensive Loss, tax | 5,405 | (195) | (1,100)
Investment Securities Net of Tax Amount [Abstract] |  |  |
Change in net unrealized gain/loss on securities available for sale Net of Tax amount | 1,809 | 2,840 | (306)
Amortization of unrealized losses on securities transferred from available for sale to held to maturity net of tax | 27 | 32 | 41
Total Investment Securities, net of tax | 1,836 | 2,872 | (265)
Change in net unrealized gain (loss) on effective cash flow derivative, Net of Tax | 428 |  |
Benefit Plans: |  |  |
Reclassification adjustment for amortization of prior service cost | (657) | 11 | 149
Reclassification adjustment for amortization of net loss | 3,278 | 3,453 | 3,953
Current year actuarial gain (loss) | (20,846) | (5,702) | (608)
Total Benefit Plans | (18,225) | (2,238) | 3,494
Total Other Comprehensive Loss After Tax | $ (15,961) | $ 634 | $ 3,229

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