Consolidated Statements of Financial Condition (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Tax certificates, allowance	$ 8,526	$ 8,811
Loans receivable, allowance for loan losses	$ 137,643	$ 162,139
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A common stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	77,158,495	61,595,321
Common stock, shares outstanding	77,158,495	61,595,321
Class B common stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	9,000,000	9,000,000
Common stock, shares issued	975,225	975,225
Common stock, shares outstanding	975,225	975,225