CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
ASSETS
Investment securities available-for-sale, amortized cost	$ 2,936,290	$ 2,599,018
Loans receivable, excluding covered loans, allowance for loan losses	234,236	229,382
Covered loans, allowance for loan losses	$ 8,665	$ 5,153
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	163,060,192	157,160,193
Common stock, shares outstanding	137,739,423	140,294,092
Treasury stock, shares	25,320,769	16,866,101
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	0	85,710