Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Tax expense (benefit) on net unrealized gains (losses) on investment securities available-for-sale	$ (2,714)	$ (214)	$ (2,487)	$ 255
Tax expense (benefit) on reclassification adjustment for realized gains on sale of investment securities available-for-sale	4	0	300	0
Tax expense on adjustment for pension and other postretirement benefits	$ 332	$ 186	$ 664	$ 372