Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Securities available-for-sale, amortized cost	$ 1,581,989	$ 1,680,491
Less: Unearned income on loans	(57,126)	(68,282)
Other real estate owned covered by FDIC loss share	28,254	35,927
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	63,033	63,033
Common stock, shares outstanding	52,635	51,265
Covered Loans [Member]
Allowance for losses on covered loans	(19,801)	(20,174)
Other real estate owned covered by FDIC loss share	$ 13,051	$ 12,093