Consolidated Balance Sheets - Unaudited (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Investment securities, held to maturity fair value		$ 330,809
Loans held for sale of mortgage warehouse loans at fair value	1,063,666
Other real estate owned, portion covered under Loss Sharing Agreements with the FDIC	$ 7,107	$ 6,166
Preferred stock, par value	$ 1,000	$ 1,000
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	18,507,121	11,395,302
Common stock, shares outstanding	18,459,502	11,347,683
Treasury stock, shares	47,619	47,619