OTHER COMPREHENSIVE INCOME (LOSS), Before and After Tax Amounts by Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Change in unrealized holding loss on securities held-to-maturity and transferred securities [Abstract]
Accretion of previously recognized non-credit component of OTTI	$ 8	$ 8	$ 17	$ 16
Change in unrealized loss on securities transferred to held-to-maturity	22	14	47	25
Net change	30	22	64	41
Tax expense	12	10	28	19
Net change in unrealized holding loss on securities held-to-maturity and transferred securities	18	12	36	22
Change in unrealized holding gain on securities available-for-sale [Abstract]
Change in net unrealized gain during the period	104	47	224	62
Tax expense	44	21	99	28
Net change in unrealized holding gain on securities available-for-sale	60	26	125	34
Change in pension and other postretirement obligations [Abstract]
Reclassification adjustment for expense included in salaries and employee benefits expense	355	425	657	850
Tax expense	161	191	292	382
Net change in pension and other postretirement obligations	194	234	365	468
Change in unrealized loss on derivative liability [Abstract]
Change in net unrealized loss during the period	(825)	(998)	(597)	(998)
Reclassification adjustment for expense included in interest expense	92	41	179	41
Net change	(733)	(957)	(418)	(957)
Tax benefit	(328)	(431)	(184)	(431)
Net change in unrealized loss on derivative liability	(405)	(526)	(234)	(526)
Other comprehensive income (loss), net of tax	$ (133)	$ (254)	$ 292	$ (2)