OTHER COMPREHENSIVE INCOME (LOSS), Before and After Tax Amounts by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Change in unrealized holding loss on securities held-to-maturity and transferred securities [Abstract]
Accretion of previously recognized non-credit component of OTTI	$ 9	$ 8
Change in unrealized loss on securities transferred to held-to-maturity	25	11
Net change	34	19
Tax expense	16	9
Net change in unrealized holding loss on securities held-to-maturity and transferred securities	18	10
Change in unrealized holding gain on securities available-for-sale [Abstract]
Change in net unrealized gain during the period	120	15
Tax expense	55	7
Net change in unrealized holding gain on securities available-for-sale	65	8
Change in pension and other postretirement obligations [Abstract]
Reclassification adjustment for expense included in salaries and employee benefits expense	302	425
Tax expense	131	191
Net change in pension and other postretirement obligations	171	234
Change in unrealized loss on derivative liability [Abstract]
Change in net unrealized loss during the period	228	0
Reclassification adjustment for expense included in interest expense	87	0
Net change	315	0
Tax expense	144	0
Net change in unrealized loss on derivative liability	171	0
Net other comprehensive income during the period	$ 425	$ 252