Loans - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	$ 66,135	$ 75,283
Current	1,205,865	1,208,799
Total Loans	1,272,000	1,284,082
Recorded Investment, 90 days past due and Accruing	775	268
Commercial, financial and agricultural
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	31,025	34,624
Current	438,790	424,950
Total Loans	469,815	459,574
Recorded Investment, 90 days past due and Accruing	546	96
Real estate - construction
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	834	3,021
Current	99,414	97,938
Total Loans	100,248	100,959
Recorded Investment, 90 days past due and Accruing	99	0
Real estate - commercial
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	29,257	32,498
Current	435,602	448,657
Total Loans	464,859	481,155
Recorded Investment, 90 days past due and Accruing	0	140
Real estate - residential
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	3,993	3,716
Current	155,433	154,156
Total Loans	159,426	157,872
Recorded Investment, 90 days past due and Accruing	130	16
Installment loans to individuals
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	979	1,330
Current	74,279	81,330
Total Loans	75,258	82,660
Recorded Investment, 90 days past due and Accruing	0	16
Lease financing receivable
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	0	0
Current	969	1,095
Total Loans	969	1,095
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	47	94
Current	1,378	673
Total Loans	1,425	767
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	14,464	12,870
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	1,849	2,297
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	709	2,613
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	9,326	5,159
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	2,237	1,956
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	302	756
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	41	89
Financing Receivables, 60 to 89 Days Past Due [Member]
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	2,743	3,480
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	1,022	902
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	399
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	1,389	1,931
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	136	207
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	190	36
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	6	5
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	48,928	58,933
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	28,154	31,425
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	125	9
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	18,542	25,408
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	1,620	1,553
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	487	538
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