CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net unrealized appreciation (depreciation) of investment securities during the year, income taxes	$ (2,120)	$ 2,028	$ 2,950
Pension and postretirement benefits, income taxes	(13,232)	628	(821)
Reclassification adjustment for amounts included in net income, income taxes	$ (830)	$ (1,139)	$ 159