Credit Quality of Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	$ 69,218	$ 57,037
Current	1,203,582	1,206,608
Total Loans	1,272,800	1,263,645
Recorded Investment, 90 days past due and Accruing	968	147
Commercial, financial and agricultural
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	34,178	29,375
Current	428,853	424,653
Total Loans	463,031	454,028
Recorded Investment, 90 days past due and Accruing	42	59
Real estate - construction
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	1,035	1,059
Current	95,330	73,893
Total Loans	96,365	74,952
Recorded Investment, 90 days past due and Accruing	819	0
Real estate - commercial
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	29,758	21,190
Current	435,095	449,951
Total Loans	464,853	471,141
Recorded Investment, 90 days past due and Accruing	0	0
Real estate - residential
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	2,897	3,633
Current	152,756	145,431
Total Loans	155,653	149,064
Recorded Investment, 90 days past due and Accruing	82	19
Installment loans to individuals
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	1,256	1,675
Current	87,281	109,334
Total Loans	88,537	111,009
Recorded Investment, 90 days past due and Accruing	25	69
Lease financing receivable
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	0	0
Current	1,449	1,968
Total Loans	1,449	1,968
Recorded Investment, 90 days past due and Accruing	0	0
Other loans
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	94	105
Current	2,818	1,378
Total Loans	2,912	1,483
Recorded Investment, 90 days past due and Accruing	0	0
Financing Receivables, 30 to 59 Days Past Due [Member]
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	8,291	6,399
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial, financial and agricultural
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	3,213	1,362
Financing Receivables, 30 to 59 Days Past Due [Member] | Real estate - construction
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	206	1,047
Financing Receivables, 30 to 59 Days Past Due [Member] | Real estate - commercial
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	3,539	1,164
Financing Receivables, 30 to 59 Days Past Due [Member] | Real estate - residential
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	853	1,703
Financing Receivables, 30 to 59 Days Past Due [Member] | Installment loans to individuals
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	397	1,022
Financing Receivables, 30 to 59 Days Past Due [Member] | Lease financing receivable
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Other loans
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	83	101
Financing Receivables, 60 to 89 Days Past Due [Member]
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	2,093	3,446
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial, financial and agricultural
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	1,255	2,317
Financing Receivables, 60 to 89 Days Past Due [Member] | Real estate - construction
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Real estate - commercial
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	0	514
Financing Receivables, 60 to 89 Days Past Due [Member] | Real estate - residential
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	457	367
Financing Receivables, 60 to 89 Days Past Due [Member] | Installment loans to individuals
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	370	244
Financing Receivables, 60 to 89 Days Past Due [Member] | Lease financing receivable
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Other loans
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	11	4
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	58,834	47,192
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial, financial and agricultural
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	29,710	25,696
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real estate - construction
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	829	12
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real estate - commercial
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	26,219	19,512
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real estate - residential
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	1,587	1,563
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Installment loans to individuals
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	489	409
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Lease financing receivable
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other loans
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	$ 0	$ 0