Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Held-to-maturity securities, fair value (in dollars)	$ 2,215,444	$ 2,131,371
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	166,494,888	166,494,888
Common stock, shares outstanding	100,786,186	99,940,399
Treasury stock, shares	65,708,702	66,554,489
Series C Preferred Stock
Preferred stock, shares authorized	150,000	150,000
Preferred stock, shares issued	135,000	135,000
Preferred stock, shares outstanding	135,000	135,000