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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of OCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net unrealized holding gain (loss)
Net of Tax	$ 14,206	$ (5,838)	$ 24,774	$ (20,069)
Less: reclassification adjustment for gains (losses) realized in net income
Net of Tax	(1)	1	3	1
Other comprehensive income (loss)
Before Tax	19,108	(7,840)	33,323	(27,002)
Tax Effect	(4,901)	2,001	(8,552)	6,932
Total other comprehensive income/(loss)	14,207	(5,839)	24,771	(20,070)
Total change to accumulated other comprehensive (loss)
Before Tax				(35,381)
Tax Effect				9,954
Net of Tax				(25,427)
ASU 2016-01
Less: reclassification related to adoption of ASU
Before Tax				8,379
Tax Effect				(2,126)
Net of Tax				6,253
ASU 2018-02
Less: reclassification related to adoption of ASU
Before Tax				0
Tax Effect				(896)
Net of Tax				(896)
Net unrealized holding gain (loss) on AFS securities
Net unrealized holding gain (loss)
Before Tax	19,106	(7,839)	33,327	(27,001)
Tax Effect	(4,900)	2,001	(8,553)	6,932
Net of Tax	14,206	(5,838)	24,774	(20,069)
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax	(2)	1	4	1
Tax Effect	1	0	(1)	0
Net of Tax	(1)	1	3	1
Other comprehensive income (loss)
Before Tax	19,108	(7,840)	33,323	(27,002)
Tax Effect	(4,901)	2,001	(8,552)	6,932
Total other comprehensive income/(loss)	$ 14,207	$ (5,839)	$ 24,771	$ (20,070)

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