Consolidated Statements of Operations and Comprehensive (Loss) Income (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Noninterest Expense:
Impairment loss on investment securities, other than-temporary loss	$ 4,500,000	$ 4,100,000
Impairment loss on investment securities, other comprehensive loss	2,300,000	2,000,000
Other comprehensive (loss) income, net of tax
Unrealized income (loss) on available for sale securities and unrecognized post-retirement costs, net income tax expense	$ (208,000)	$ 1,232,000