CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) on investment securities, deferred income tax expense (benefit)	$ (1,226)	$ (2,288)	$ 11,145	$ (7,998)
Reclassification adjustment for realized investment (gains) included in net income, income tax (expense)	(252)	(89)	(1,613)	(2,713)
Reclassification adjustment for amounts amortized into net periodic pension and postretirement benefit income, deferred income tax (expense)	$ (62)	$ (169)	$ (327)	$ (520)