Loans and the Allowance for Loan Losses (Details 7) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Loan portfolio not subject to risk rating
Loan portfolio	$ 1,401,218	$ 1,402,738
Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Loan portfolio	80,788	89,666
Lease financing
Loan portfolio not subject to risk rating
Loan portfolio	623	53
Real estate – construction
Loan portfolio not subject to risk rating
Loan portfolio	42,480	43,535
Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Loan portfolio	948,762	941,521
Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Loan portfolio	245,040	243,029
Installment loans to individuals
Loan portfolio not subject to risk rating
Loan portfolio	83,525	84,934
Performing
Loan portfolio not subject to risk rating
Loan portfolio	1,398,490	1,399,290
Performing | Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Loan portfolio	80,738	89,490
Performing | Lease financing
Loan portfolio not subject to risk rating
Loan portfolio	623	53
Performing | Real estate – construction
Loan portfolio not subject to risk rating
Loan portfolio	42,480	43,535
Performing | Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Loan portfolio	946,404	938,994
Performing | Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Loan portfolio	244,863	242,363
Performing | Installment loans to individuals
Loan portfolio not subject to risk rating
Loan portfolio	83,382	84,855
Non- Performing
Loan portfolio not subject to risk rating
Loan portfolio	2,728	3,448
Non- Performing | Commercial, financial, agricultural
Loan portfolio not subject to risk rating
Loan portfolio	50	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	0	0
Non- Performing | Real estate – 1-4 family mortgage
Loan portfolio not subject to risk rating
Loan portfolio	2,358	2,527
Non- Performing | Real estate – commercial mortgage
Loan portfolio not subject to risk rating
Loan portfolio	177	666
Non- Performing | Installment loans to individuals
Loan portfolio not subject to risk rating
Loan portfolio	$ 143	$ 79