Loans - Age Analysis of Past Due Loans by Class of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	$ 50,968	$ 37,396
Current	911,775	1,146,030
Total Loans	962,743	1,183,426
Recorded Investment, 90 days past due and Accruing	7	728
Commercial, financial and agricultural
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	24,771	17,935
Current	271,031	417,272
Total Loans	295,802	435,207
Recorded Investment, 90 days past due and Accruing	6	545
Real estate - construction
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	1,262	806
Current	89,182	89,481
Total Loans	90,444	90,287
Recorded Investment, 90 days past due and Accruing	0	125
Real estate – commercial
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	21,730	16,454
Current	372,686	431,952
Total Loans	394,416	448,406
Recorded Investment, 90 days past due and Accruing	0	58
Real estate - residential
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	2,978	1,859
Current	133,173	144,892
Total Loans	136,151	146,751
Recorded Investment, 90 days past due and Accruing	0	0
Consumer and other
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	227	342
Current	45,111	56,056
Total Loans	45,338	56,398
Recorded Investment, 90 days past due and Accruing	1	0
Lease financing receivable
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	0	0
Current	592	732
Total Loans	592	732
Recorded Investment, 90 days past due and Accruing	0	0
Other
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due		0
Current		5,645
Total Loans		5,645
Recorded Investment, 90 days past due and Accruing		0
30-59 Days Past Due
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	8,462	9,041
30-59 Days Past Due | Commercial, financial and agricultural
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	4,814	1,195
30-59 Days Past Due | Real estate - construction
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	1,086	616
30-59 Days Past Due | Real estate – commercial
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	1,200	5,889
30-59 Days Past Due | Real estate - residential
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	1,234	1,065
30-59 Days Past Due | Consumer and other
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	128	276
30-59 Days Past Due | Lease financing receivable
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	0	0
30-59 Days Past Due | Other
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due		0
60-89 Days Past Due
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	868	8,562
60-89 Days Past Due | Commercial, financial and agricultural
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	49	1,893
60-89 Days Past Due | Real estate - construction
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	0	0
60-89 Days Past Due | Real estate – commercial
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	521	6,402
60-89 Days Past Due | Real estate - residential
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	237	235
60-89 Days Past Due | Consumer and other
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	61	32
60-89 Days Past Due | Lease financing receivable
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	0	0
60-89 Days Past Due | Other
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due		0
Greater than 90 Days Past Due
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	41,638	19,793
Greater than 90 Days Past Due | Commercial, financial and agricultural
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	19,908	14,847
Greater than 90 Days Past Due | Real estate - construction
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	176	190
Greater than 90 Days Past Due | Real estate – commercial
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	20,009	4,163
Greater than 90 Days Past Due | Real estate - residential
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	1,507	559
Greater than 90 Days Past Due | Consumer and other
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	38	34
Greater than 90 Days Past Due | Lease financing receivable
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due	$ 0	0
Greater than 90 Days Past Due | Other
Age Analysis of Past Due Loans by Class of Loans [Abstract]
Total Past Due		$ 0