CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
ASSETS
Investment securities available-for-sale, amortized cost	$ 2,534,163	$ 2,786,490
Loans receivable, excluding covered loans, allowance for loan losses	246,468	241,930
Covered loans, allowance for loan losses	$ 4,880	$ 7,745
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	163,488,203	163,098,008
Common stock, shares outstanding	143,389,155	137,630,896
Treasury stock, shares	20,099,048	25,467,112