Loans and the Allowance for Loan Losses - (Details 7) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Loan portfolio not subject to risk rating
Loan portfolio	$ 1,643,403	$ 1,551,189
Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Loan portfolio	137,948	115,175
Lease financing
Loan portfolio not subject to risk rating
Loan portfolio	17,218	10,114
Real estate – construction
Loan portfolio not subject to risk rating
Loan portfolio	63,780	60,523
Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Loan portfolio	1,058,044	1,013,375
Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Loan portfolio	282,021	268,219
Installment loans to individuals
Loan portfolio not subject to risk rating
Loan portfolio	84,392	83,783
Performing
Loan portfolio not subject to risk rating
Loan portfolio	1,638,777	1,546,689
Performing | Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Loan portfolio	137,693	114,996
Performing | Lease financing
Loan portfolio not subject to risk rating
Loan portfolio	17,218	10,114
Performing | Real estate – construction
Loan portfolio not subject to risk rating
Loan portfolio	63,743	60,323
Performing | Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Loan portfolio	1,055,294	1,010,645
Performing | Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Loan portfolio	280,507	266,867
Performing | Installment loans to individuals
Loan portfolio not subject to risk rating
Loan portfolio	84,322	83,744
Non- Performing
Loan portfolio not subject to risk rating
Loan portfolio	4,626	4,500
Non- Performing | Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Loan portfolio	255	179
Non- Performing | Lease financing
Loan portfolio not subject to risk rating
Loan portfolio	0	0
Non- Performing | Real estate – construction
Loan portfolio not subject to risk rating
Loan portfolio	37	200
Non- Performing | Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Loan portfolio	2,750	2,730
Non- Performing | Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Loan portfolio	1,514	1,352
Non- Performing | Installment loans to individuals
Loan portfolio not subject to risk rating
Loan portfolio	$ 70	$ 39