Consolidated Statements Of Changes In Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Changes In Stockholders' Equity [Abstract]
Unrealized gain on securities, tax	$ 2,075	$ 3,478	$ 1,300
Cash dividend per share	$ 0.48	$ 0.48	$ 0.8
Reclassification adjustment for losses included in net income, tax benefit	$ 60
Shares of common stock purchased	165,154