Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Tax expense (benefit) on net unrealized gains (losses) on investment securities available-for-sale	$ 857	$ 227
Tax expense (benefit) on reclassification adjustment for realized gains on sale of investment securities available-for-sale	0	296
Tax expense (benefit) on adjustment for pension and other postretirement benefits	$ (201)	$ 332