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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of OCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net unrealized gain (loss) arising during the period
Net of Tax	$ 2,288	$ (4,341)			$ 14,967	$ (14,154)
Less: reclassification adjustment for gains (losses) realized in net income
Net of Tax	120	0			120	0
Other comprehensive income (loss)
Before Tax	2,830	(5,551)			19,374	(18,419)
Tax Effect	(662)	1,210			(4,527)	4,265
Total other comprehensive income (loss)	2,168	(4,341)	$ 12,679	$ (9,813)	14,847	(14,154)
Net unrealized (loss) gain on AFS Securities
Net unrealized gain (loss) arising during the period
Before Tax	3,357	(5,850)			21,903	(19,639)
Tax Effect	(784)	1,291			(5,118)	4,565
Net of Tax	2,573	(4,559)			16,785	(15,074)
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax	157	0			157	0
Tax Effect	(37)	0			(37)	0
Net of Tax	120	0			120	0
Other comprehensive income (loss)
Before Tax	3,200	(5,850)			21,746	(19,639)
Tax Effect	(747)	1,291			(5,081)	4,565
Total other comprehensive income (loss)	2,453	(4,559)			16,665	(15,074)
Net unrealized loss on cash flow hedging derivatives
Net unrealized gain (loss) arising during the period
Before Tax	(370)				(2,372)
Tax Effect	85				554
Net of Tax	(285)				(1,818)
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax	0				0
Tax Effect	0				0
Net of Tax	0				0
Other comprehensive income (loss)
Before Tax	(370)				(2,372)
Tax Effect	85				554
Total other comprehensive income (loss)	(285)				(1,818)
Net unrealized gain on post-retirement plans
Net unrealized gain (loss) arising during the period
Before Tax	0	0			0	41
Tax Effect	0	0			0	(10)
Net of Tax	0	0			0	31
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax	0	0			0	0
Tax Effect	0	0			0	0
Net of Tax	0	0			0	0
Other comprehensive income (loss)
Before Tax	0	0			0	41
Tax Effect	0	0			0	(10)
Total other comprehensive income (loss)	$ 0	0			$ 0	31
Net unrealized gain on cash flow hedging derivatives
Net unrealized gain (loss) arising during the period
Before Tax		299				1,179
Tax Effect		(81)				(290)
Net of Tax		218				889
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax		0				0
Tax Effect		0				0
Net of Tax		0				0
Other comprehensive income (loss)
Before Tax		299				1,179
Tax Effect		(81)				(290)
Total other comprehensive income (loss)		$ 218				$ 889

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