Acquired Loans Part 4 (Details) (USD $)	9 Months Ended		12 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2013 BancTrust Financial Group, Inc. [Member]	Feb. 15, 2013 BancTrust Financial Group, Inc. [Member]	Sep. 30, 2014 Covered Loans [Member]	Sep. 30, 2013 Covered Loans [Member]	Sep. 30, 2014 Noncovered Loans [Member]	Sep. 30, 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	4,992,000	1,870,000				(611,000)	(1,168,000)	5,603,000	3,038,000
Loans charged-off	(4,227,000)	(3,691,000)				(917,000)	(663,000)	(3,310,000)	(3,028,000)
Recoveries	1,548,000	1,079,000				(46,000)	(33,000)	1,594,000	1,112,000
Net charge-offs	(2,679,000)	(2,612,000)				(963,000)	(696,000)	(1,716,000)	(1,916,000)
Balance, ending	11,949,000	5,333,000	9,636,000			813,000	2,326,000	11,136,000	3,007,000
Revolving credit agreements acquired					153,900,000
Nonaccrual loans not accounted for under FASB ASC Topic 310 30	988,000		2,400,000
Decrease in acquired non covered loans as measurement period adjustment			$ 6,800,000	$ 6,800,000