Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Investment securities held-to-maturity, fair value	$ 428,585	$ 534,637
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	400,000,000	400,000,000
Common Stock, shares issued	52,177,352	52,223,460
Common Stock, shares outstanding	30,358,509	38,884,953
Treasury stock, shares	20,982,812	12,383,109