Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Tax expense (benefit) on net unrealized gains (losses) on investment securities available-for-sale	$ 742	$ (1,084)	$ 2,212	$ 177
Tax expense (benefit) on reclassification adjustment for realized gains on sale of investment securities available-for-sale	(6)	(10)	(13)	(212)
Tax expense (benefit) on adjustment for pension and other postretirement benefits	$ (202)	$ 380	$ (404)	$ 761