Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Tax expense (benefit) on net unrealized gains (losses) on investment securities available-for-sale	$ 655	$ (615)	$ 832	$ 1,150
Tax expense (benefit) on reclassification adjustment for realized gains on sale of investment securities available-for-sale	(2)	0	(214)	0
Tax expense (benefit) on adjustment for pension and other postretirement benefits	$ 381	$ (201)	$ 1,142	$ (604)