Credit Quality of Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	$ 62,455	$ 57,037
Current	1,199,934	1,206,608
Total Loans	1,262,389	1,263,645
Recorded Investment, 90 days past due and Accruing	56	147
Commercial, financial and agricultural
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	31,434	29,375
Current	424,830	424,653
Total Loans	456,264	454,028
Recorded Investment, 90 days past due and Accruing	34	59
Real estate - construction
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	683	1,059
Current	95,648	73,893
Total Loans	96,331	74,952
Recorded Investment, 90 days past due and Accruing	0	0
Real estate - commercial
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	25,322	21,190
Current	437,820	449,951
Total Loans	463,142	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	3,463	3,633
Current	144,916	145,431
Total Loans	148,379	149,064
Recorded Investment, 90 days past due and Accruing	0	19
Installment loans to individuals
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	1,452	1,675
Current	93,070	109,334
Total Loans	94,522	111,009
Recorded Investment, 90 days past due and Accruing	22	69
Lease financing receivable
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	0	0
Current	1,641	1,968
Total Loans	1,641	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	101	105
Current	2,009	1,378
Total Loans	2,110	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	10,636	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	4,936	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	24	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	3,642	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	1,054	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	886	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	94	101
Financing Receivables, 60 to 89 Days Past Due [Member]
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	4,675	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	2,963	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	649	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	254	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	670	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	132	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	7	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	47,144	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	23,535	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	10	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	21,426	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	1,739	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	434	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