Loans and the Allowance for Loan Losses (Details 7) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Loan portfolio not subject to risk rating
Loan portfolio	$ 1,506,463	$ 1,402,738
Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Loan portfolio	103,550	89,666
Lease financing
Loan portfolio not subject to risk rating
Loan portfolio	5,377	53
Real estate – construction
Loan portfolio not subject to risk rating
Loan portfolio	62,796	43,535
Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Loan portfolio	990,844	941,521
Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Loan portfolio	259,030	243,029
Installment loans to individuals
Loan portfolio not subject to risk rating
Loan portfolio	84,866	84,934
Performing
Loan portfolio not subject to risk rating
Loan portfolio	1,501,625	1,399,290
Performing | Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Loan portfolio	103,391	89,490
Performing | Lease financing
Loan portfolio not subject to risk rating
Loan portfolio	5,377	53
Performing | Real estate – construction
Loan portfolio not subject to risk rating
Loan portfolio	62,635	43,535
Performing | Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Loan portfolio	987,332	938,994
Performing | Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Loan portfolio	258,092	242,363
Performing | Installment loans to individuals
Loan portfolio not subject to risk rating
Loan portfolio	84,798	84,855
Non- Performing
Loan portfolio not subject to risk rating
Loan portfolio	4,838	3,448
Non- Performing | Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Loan portfolio	159	176
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	161	0
Non- Performing | Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Loan portfolio	3,512	2,527
Non- Performing | Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Loan portfolio	938	666
Non- Performing | Installment loans to individuals
Loan portfolio not subject to risk rating
Loan portfolio	$ 68	$ 79