Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Held-to-maturity securities, fair value	$ 2,469,458	$ 2,286,092
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	166,494,888	166,494,888
Common stock, shares outstanding (in shares)	101,406,550	100,721,358
Treasury stock (in shares)	65,088,338	65,773,530
Series C Preferred Stock
Preferred stock, shares authorized (in shares)	150,000	150,000
Preferred stock, shares issued (in shares)	135,000	135,000
Preferred stock, shares outstanding (in shares)	135,000	135,000