Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Securities available-for-sale, amortized cost	$ 1,680,491	$ 969,359
Other real estate owned covered by FDIC loss share	35,927	26,987
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	63,033	63,033
Common stock, outstanding	51,265	39,686
Noncovered Loans [Member]
Unearned income on loans	(68,282)	(7,767)
Allowance for losses	(52,280)	(52,244)
Other real estate owned covered by FDIC loss share	23,834	10,676
Covered Loans [Member]
Allowance for losses	(20,174)	(30,056)
Other real estate owned covered by FDIC loss share	$ 12,093	$ 16,311