Consolidated Statements of Financial Condition (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 1,000	$ 1,000
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued
Common stock, Par value	$ 0.01	$ 0.01
Common stock, shares authorized	55,000,000	55,000,000
Common stock, shares issued	33,566,772	33,566,772
Common stock, shares outstanding	17,660,229	17,894,929
Treasury stock, shares	15,906,543	15,671,843