Consolidated Statements of Financial Condition (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Held-to-maturity securities, fair value (in dollars)	$ 1,882,671	$ 1,725,090
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	98,865,122	98,419,318
Treasury stock, shares	67,629,766	68,075,570
Unallocated common stock held by ESOP, shares	453,470	967,013
Series C Preferred Stock
Preferred stock, shares authorized	150,000
Preferred stock, shares issued	135,000	0
Preferred stock, shares outstanding	135,000	0