Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Available-for-sale securities pledged as collateral	$ 498,658	$ 534,327
Allowance for loan losses	297,654	287,128
Loans held-for-investment pledged as collateral	19,495,480	18,880,598
Premises and equipment, accumulated depreciation	$ 109,126	$ 111,898
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)	165,544,235	165,214,770
Treasury stock, shares (in shares)	20,671,710	20,671,710