Consolidated Statements of Financial Condition (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Held-to-maturity securities, fair value	$ 2,014,151	$ 2,042,110
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 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	98,488,313	97,877,469
Treasury stock, shares	68,006,575	68,617,419
Unallocated common stock held by ESOP, shares	3,029,138	3,441,130