CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of OCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net unrealized gain (loss) arising during the period
Net of Tax	$ 664	$ 4,369
Less: reclassification adjustment for gains (losses) realized in net income
Net of Tax	0	933
Other comprehensive income (loss)
Before Tax	950	5,286
Tax Effect	(286)	(1,850)
Total other comprehensive income	664	3,436
Net unrealized holding loss on AFS securities
Net unrealized gain (loss) arising during the period
Before Tax	1,116	7,363
Tax Effect	(348)	(2,577)
Net of Tax	768	4,786
Less: reclassification adjustment for gains (losses) realized in net income
Before Tax	0	1,436
Tax Effect	0	(503)
Net of Tax	0	933
Other comprehensive income (loss)
Before Tax	1,116	5,927
Tax Effect	(348)	(2,074)
Total other comprehensive income	768	3,853
Net unrealized loss on effective cash flow hedging derivatives
Net unrealized gain (loss) arising during the period
Before Tax	(223)	(714)
Tax Effect	83	250
Net of Tax	(140)	(464)
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	(223)	(714)
Tax Effect	83	250
Total other comprehensive income	(140)	(464)
Net unrealized holding loss on post-retirement plans
Net unrealized gain (loss) arising during the period
Before Tax	57	73
Tax Effect	(21)	(26)
Net of Tax	36	47
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	57	73
Tax Effect	(21)	(26)
Total other comprehensive income	$ 36	$ 47