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SHAREHOLDERS’ EQUITY AND EARNINGS PER COMMON SHARE - Components of OCI (Details) - USD ($) $ in Thousands	12 Months Ended
	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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