Acquired Loans Part 4 (Details) (USD $)	3 Months Ended		12 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2013 BancTrust Financial Group, Inc. [Member]	Feb. 15, 2013 BancTrust Financial Group, Inc. [Member]	Mar. 31, 2014 Covered Loans [Member]	Mar. 31, 2013 Covered Loans [Member]	Mar. 31, 2014 Noncovered Loans [Member]	Mar. 31, 2013 Noncovered Loans [Member]
Allowance for loan loss [Abstract]
Balance, beginning	$ 9,636,000	$ 6,075,000	$ 6,075,000			$ 2,387,000	$ 4,190,000	$ 7,249,000	$ 1,885,000
Provision for loan losses, acquired loans	63,000	130,000				(474,000)	(564,000)	537,000	694,000
Loans charged-off	676,000	220,000				(53,000)	862,000	729,000	(642,000)
Recoveries	165,000	33,000				(60,000)	9,000	225,000	24,000
Net (charge-offs) recoveries	841,000	253,000				(113,000)	871,000	954,000	(618,000)
Balance, ending	10,540,000	6,458,000	9,636,000			1,800,000	4,497,000	8,740,000	1,961,000
Revolving credit agreements acquired					153,900,000
Nonaccrual loans not accounted for under FASB ASC Topic 310 30	2,800,000		2,400,000
Decrease in acquired non covered loans as measurement period adjustment			$ 6,800,000	$ 6,800,000