Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Allowance for covered loans	$ 18,221	$ 18,275
Common stock, par value (in usd per share)	$ 0	$ 0
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	111,960,580	111,889,959
Common stock, shares, outstanding	111,960,580	111,889,959