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SHAREHOLDERS’ EQUITY AND EARNINGS PER COMMON SHARE - Components of OCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net unrealized gain (loss) arising during the period |  |  |
Net of Tax | $ 13,476 | $ (6,998) | $ (229)
Less: reclassification adjustment for gains (losses) realized in net income |  |  |
Net of Tax | (2,237) | (730) | (1)
Other comprehensive income (loss) |  |  |
Before Tax | 20,512 | (8,125) | (638)
Tax Effect | (4,799) | 1,857 | 410
Total other comprehensive income (loss) | 15,713 | (6,268) | (228)
Net unrealized gain (loss) on AFS securities |  |  |
Net unrealized gain (loss) arising during the period |  |  |
Before Tax | 18,883 | (9,487) | 545
Tax Effect | (4,489) | 2,194 | (121)
Net of Tax | 14,394 | (7,293) | 424
Less: reclassification adjustment for gains (losses) realized in net income |  |  |
Before Tax | 237 | (924) | 19
Tax Effect | (55) | 216 | (7)
Net of Tax | 182 | (708) | 12
Other comprehensive income (loss) |  |  |
Before Tax | 18,646 | (8,563) | 526
Tax Effect | (4,434) | 1,978 | (114)
Total other comprehensive income (loss) | 14,212 | (6,585) | 412
Net unrealized loss on derivative hedges |  |  |
Net unrealized gain (loss) arising during the period |  |  |
Before Tax | (940) | 654 | (838)
Tax Effect | 289 | (168) | 386
Net of Tax | (651) | 486 | (452)
Less: reclassification adjustment for gains (losses) realized in net income |  |  |
Before Tax | (3,156) | 0 | 0
Tax Effect | 737 | 0 | 0
Net of Tax | (2,419) | 0 | 0
Other comprehensive income (loss) |  |  |
Before Tax | 2,216 | 654 | (838)
Tax Effect | (448) | (168) | 386
Total other comprehensive income (loss) | 1,768 | 486 | (452)
Net unrealized loss on post-retirement plans |  |  |
Net unrealized gain (loss) arising during the period |  |  |
Before Tax | (350) | (245) | (347)
Tax Effect | 83 | 54 | 146
Net of Tax | (267) | (191) | (201)
Less: reclassification adjustment for gains (losses) realized in net income |  |  |
Before Tax | 0 | (29) | (21)
Tax Effect | 0 | 7 | 8
Net of Tax | 0 | (22) | (13)
Other comprehensive income (loss) |  |  |
Before Tax | (350) | (216) | (326)
Tax Effect | 83 | 47 | 138
Total other comprehensive income (loss) | $ (267) | $ (169) | $ (188)

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