Consolidated Statements of Condition Parenthetical (USD $)	Dec. 31, 2012	Dec. 31, 2011
Shareholders' equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	15,000,000	15,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	85,000,000	85,000,000
Common stock, shares issued	23,423,306	23,423,306
Common stock, shares outstanding	10,874,687	10,874,668
Treasury stock, at cost	12,548,619	12,548,638