CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains on investment securities, deferred income tax expense	$ 6,610	$ 2,689
Reclassification adjustment for realized investment (gains) included in net income, income tax (expense)	(290)	(764)
Reclassification adjustment for amounts amortized into net periodic pension and postretirement benefit income, deferred income tax (expense)	$ (136)	$ (190)