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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Components of OCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net unrealized gain (loss) arising during the period |  |  |
Before Tax | $ 2,892 | $ 1,768 |
Less: reclassification adjustment for gains (losses) realized in net income |  |  |
Before Tax | (3,935) | 3,156 |
Other comprehensive income |  |  |
Before Tax | 9,253 | 20,512 | $ (8,125)
Tax Effect | (2,148) | (4,799) | 1,857
Total other comprehensive income (loss) | 7,105 | 15,713 | (6,268)
Net unrealized gain (loss) on AFS securities |  |  |
Net unrealized gain (loss) arising during the period |  |  |
Before Tax | 11,264 | 18,883 | (9,487)
Tax Effect | (2,636) | (4,489) | 2,194
Net of Tax | 8,628 | 14,394 | (7,293)
Less: reclassification adjustment for gains (losses) realized in net income |  |  |
Before Tax | 5,445 | 237 | (924)
Tax Effect | (1,291) | (55) | 216
Net of Tax | 4,154 | 182 | (708)
Other comprehensive income |  |  |
Before Tax | 5,819 | 18,646 | (8,563)
Tax Effect | (1,345) | (4,434) | 1,978
Total other comprehensive income (loss) | 4,474 | 14,212 | (6,585)
Net unrealized gain (loss) on effective cash flow hedging derivatives |  |  |
Net unrealized gain (loss) arising during the period |  |  |
Before Tax | (1,080) | (938) | 654
Tax Effect | 37 | 289 | (168)
Net of Tax | (1,043) | (649) | 486
Less: reclassification adjustment for gains (losses) realized in net income |  |  |
Before Tax | (4,852) | (3,156) |
Tax Effect | 917 | 737 |
Net of Tax | (3,935) | (2,419) |
Other comprehensive income |  |  |
Before Tax | 3,772 | 2,218 | 654
Tax Effect | (880) | (448) | (168)
Total other comprehensive income (loss) | 2,892 | 1,770 | 486
Net unrealized gain (loss) on post-retirement plans |  |  |
Net unrealized gain (loss) arising during the period |  |  |
Before Tax | (338) | (352) | (245)
Tax Effect | 77 | 83 | 54
Net of Tax | (261) | (269) | (191)
Less: reclassification adjustment for gains (losses) realized in net income |  |  |
Before Tax |  |  | (29)
Tax Effect |  |  | 7
Net of Tax |  |  | (22)
Other comprehensive income |  |  |
Before Tax | (338) | (352) | (216)
Tax Effect | 77 | 83 | 47
Total other comprehensive income (loss) | $ (261) | $ (269) | $ (169)

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