Acquired Loans Part 4 (Details) (USD $)	3 Months Ended	6 Months Ended			3 Months Ended			6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 BancTrust Financial Group, Inc. [Member]	Feb. 15, 2013 BancTrust Financial Group, Inc. [Member]	Mar. 16, 2012 Bay Bank and Trust Company [Member]	Jun. 30, 2013 Covered Loans [Member]	Jun. 30, 2012 Covered Loans [Member]	Jun. 30, 2013 Noncovered Loans [Member]	Jun. 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		(1,422,000)	1,478,000					(1,328,000)	1,380,000	(94,000)	98,000
Loans charged-off		(2,444,000)	(646,000)					(302,000)	(591,000)	(2,142,000)	(55,000)
Recoveries		481,000	192,000					18,000	173,000	463,000	19,000
Net charge-offs		(1,963,000)	(454,000)					(284,000)	(418,000)	(1,679,000)	(36,000)
Balance, ending	2,690,000	2,690,000	1,526,000					2,578,000	1,464,000	112,000	62,000
Revolving credit agreements acquired						153,900,000	5,900,000
Nonaccrual loans not accounted for under FASB ASC Topic 310 30	2,200,000	2,200,000		1,100,000
Decrease in acquired non covered loans as measurement period adjustment	$ 524,000				$ 524,000