Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Available-for-sale securities pledged as collateral	$ 640,853	$ 767,437
Held-to-maturity investment security, fair value	133,656	144,593
Allowance for loan losses	263,094	260,520
Loans held-for-investment pledged as collateral	17,159,894	16,441,068
Premises and equipment, accumulated depreciation	$ 103,933	$ 114,890
STOCKHOLDERS’ EQUITY
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	165,119,710	164,604,072
Treasury stock, shares (in shares)	20,658,144	20,436,621