UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Amortization and reversal of net unrealized loss on securities transferred from available-for-sale to held-to-maturity, tax expense	$ 5	$ 11
Reduction in non-credit component of other than temporary impairment ("OTTI") charge, deferred taxes	4	4
Reclassification adjustment for securities sold during the period, income tax benefit	0	(624)
Net unrealized securities gains arising during the period, deferred tax expense	7	19
Change in pension and other postretirement obligations, deferred tax expense (benefit)	$ 191	$ (268)