CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Change in unrealized gain (loss) on securities available for sale, tax	$ (887)	$ (766)	$ 4,060
Change in unrealized gain on securities transferred, tax	881	250	(1,180)
Net actuarial loss adjustment on pension and post-retirement plan benefit obligation, tax	$ (648)	$ (628)	$ (2,929)