CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Investment securities available-for-sale, amortized cost	$ 2,599,018	$ 3,132,968
Loans receivable, excluding covered loans, allowance for loan losses	229,382	209,876
Covered loans, allowance for loan losses	$ 5,153	$ 6,647
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	157,160,193	156,798,011
Common stock, shares outstanding	140,294,092	149,327,907
Treasury stock, shares	16,866,101	7,470,104
Preferred stock, Series A, non-cumulative convertible
STOCKHOLDERS' EQUITY
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	200,000	200,000
Preferred stock, shares outstanding	85,710	85,710