Loans - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	$ 50,640	$ 75,283
Current	1,189,613	1,208,799
Total Loans	1,240,253	1,284,082
Recorded Investment, 90 days past due and Accruing	165	268
Commercial, financial and agricultural
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	30,111	34,624
Current	421,656	424,950
Total Loans	451,767	459,574
Recorded Investment, 90 days past due and Accruing	165	96
Real estate - construction
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	3,006	3,021
Current	95,689	97,938
Total Loans	98,695	100,959
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	14,665	32,498
Current	446,399	448,657
Total Loans	461,064	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	1,946	3,716
Current	154,448	154,156
Total Loans	156,394	157,872
Recorded Investment, 90 days past due and Accruing	0	16
Installment loans to individuals
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	850	1,330
Current	69,181	81,330
Total Loans	70,031	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	866	1,095
Total Loans	866	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	62	94
Current	1,374	673
Total Loans	1,436	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	17,155	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	10,058	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	2,981	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	2,985	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	694	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	381	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	56	89
Financing Receivables, 60 to 89 Days Past Due [Member]
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	4,678	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	191	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	4,164	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	157	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	160	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	28,807	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	19,862	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	25	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	7,516	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	1,095	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	309	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