Consolidated Statements of Financial Condition (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Stockholder's equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	49,000,000	49,000,000
Common stock, issued shares	23,211,846	23,211,846
Common stock, outstanding shares	22,087,486	22,097,392
Treasury Stock Shares	1,124,360	1,114,454