OTHER COMPREHENSIVE INCOME (LOSS), Before and After Tax Amounts by Component (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Change in unrealized holding loss on securities held-to-maturity and transferred securities [Abstract]
Accretion (Amortization) of previously recognized non-credit component of OTTI	$ 9	$ 9	$ 25	$ (18)
Change in unrealized loss on securities transferred to held-to-maturity	12	11	37	57
Net change	21	20	62	39
Tax expense	7	9	26	18
Net change in unrealized holding loss on securities held-to-maturity and transferred securities	14	11	36	21
Change in unrealized holding gain on securities available-for-sale [Abstract]
Change in net unrealized gain during the period	107	(176)	169	(141)
Reclassification adjustment for net gains included in net gain (loss) on securities and other assets	0	0	0	(1,384)
Net change	107	(176)	169	(1,525)
Tax expense (benefit)	43	(79)	71	(688)
Net change in unrealized holding gain on securities available-for-sale	64	(97)	98	(837)
Change in pension and other postretirement obligations [Abstract]
Reclassification adjustment for expense included in salaries and employee benefits expense	425	478	1,275	1,412
Change in the net actuarial gain or loss	0	0	0	(1,064)
Net change	425	478	1,275	348
Tax expense	191	216	573	158
Net change in pension and other postretirement obligations	234	262	702	190
Change in unrealized loss on derivative liability [Abstract]
Change in net unrealized loss during the period	717	0	(281)	0
Reclassification adjustment for expense included in interest expense	(9)	0	32	0
Net change	708	0	(249)	0
Tax expense (benefit)	327	0	(104)	0
Net change in unrealized loss on derivative liability	381	0	(145)	0
Other comprehensive income (loss), net of tax	$ 693	$ 176	$ 691	$ (626)