Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Tax expense (benefit) on net unrealized gains (losses) on investment securities available-for-sale	$ (392)	$ 491	$ (2,879)	$ 746
Tax expense (benefit) on reclassification adjustment for realized gains on sale of investment securities available-for-sale	0	0	300	0
Tax expense on adjustment for pension and other postretirement benefits	$ 332	$ 187	$ 996	$ 559