Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Investment securities
Investment securities, fair value	$ 687,127	$ 528,458
Real Estate Owned, Valuation Allowance	$ 24,195	$ 36,873
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 0.00006	$ 0.00006
Common stock, authorized (in shares)	2,500,000,000	2,500,000,000
Common stock, shares issued (in shares)	73,163,275	72,415,346
Common stock, shares outstanding (in shares)	73,163,275	72,415,346
Treasury stock, shares at cost (in shares)	4,304,782	4,087,995