Consolidated Statements of Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Fair Value	$ 4,181,613	$ 4,504,495
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, authorized shares	500,000,000	500,000,000
Common Stock, issued shares	57,749,071	57,634,755
Common Stock, outstanding shares	43,342,940	43,724,208
Treasury Stock, Shares	14,406,131	13,910,547