ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding (losses) gains on available for sale securities	$ (8,587)	$ 1,616
Income tax effect	2,499	(606)
Net change in unrealized (losses) gains on available for sale securities	(6,088)	1,010
Reclassification adjustment for amortization realized in income	95	114
Income tax effect	(28)	(17)
Net change in post-retirement obligation	67	97
Change in fair value of derivatives used for cash flow hedges	2,827	25
Reclassification adjustment for losses realized in income	65	275
Income tax effect	(841)	(126)
Net change in unrealized gains on cash flow hedges	2,051	174
Other comprehensive (loss) income	$ (3,970)	$ 1,281