Acquired Loans Part 4 (Details) (USD $)	9 Months Ended			9 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 BancTrust Financial Group, Inc. [Member]	Feb. 15, 2013 BancTrust Financial Group, Inc. [Member]	Mar. 16, 2012 Bay Bank and Trust Company [Member]	Sep. 30, 2013 Covered Loans [Member]	Sep. 30, 2012 Covered Loans [Member]	Sep. 30, 2013 Noncovered Loans [Member]	Sep. 30, 2012 Noncovered Loans [Member]
Allowance for loan loss [Abstract]
Balance, beginning	$ 6,075,000	$ 502,000					$ 4,190,000	$ 502,000	$ 1,885,000	$ 0
Provision for loan losses, acquired loans	1,870,000	3,583,000					(1,168,000)	2,655,000	3,038,000	928,000
Loans charged-off	(3,691,000)	(104,000)					(663,000)	174,000	(3,028,000)	(278,000)
Recoveries	1,079,000	362,000					(33,000)	195,000	1,112,000	167,000
Net recoveries (charge-offs)	(2,612,000)	258,000					(696,000)	369,000	(1,916,000)	(111,000)
Balance, ending	5,333,000	4,343,000					2,326,000	3,526,000	3,007,000	817,000
Revolving credit agreements acquired					153,900,000	5,900,000
Nonaccrual loans not accounted for under FASB ASC Topic 310 30	3,000,000		1,100,000
Decrease in acquired non covered loans as measurement period adjustment	$ 6,800,000			$ 6,800,000