CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Unrealized appreciation (depreciation) of investment securities during the period, income taxes	$ 3,195	$ (2,120)	$ 2,028
Pension and postretirement benefits, income taxes	(2,532)	(13,232)	628
Reclassification adjustments for amounts included in net income, income taxes	$ (1,162)	$ (830)	$ (1,139)