Loans - Aging of recorded investment in past due loans (Details 5) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due	$ 1,844	$ 3,657
90 Days or More Past Due		127
Nonaccrual Loans	12,401	14,044
Total Past Due	14,245	17,828
Loans Not Past Due	1,012,838	991,487
Loans	1,027,083	1,009,315
Commercial, financial, and agricultural
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
Loans	226,248	210,712
Commercial, financial, and agricultural | Commercial
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due		39
90 Days or More Past Due
Nonaccrual Loans	751	831
Total Past Due	751	870
Loans Not Past Due	144,691	125,735
Loans	145,442	126,605
Commercial, financial, and agricultural | Financial
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due
90 Days or More Past Due
Nonaccrual Loans
Total Past Due
Loans Not Past Due	4,224	4,678
Loans	4,224	4,678
Commercial, financial, and agricultural | Agricultural
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due
90 Days or More Past Due
Nonaccrual Loans		182
Total Past Due		182
Loans Not Past Due	10,540	10,712
Loans	10,540	10,894
Commercial, financial, and agricultural | Equity lines
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due
90 Days or More Past Due
Nonaccrual Loans	140	75
Total Past Due	140	75
Loans Not Past Due	40,915	40,536
Loans	41,055	40,611
Commercial, financial, and agricultural | Other
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due
90 Days or More Past Due
Nonaccrual Loans	59	63
Total Past Due	59	63
Loans Not Past Due	24,928	27,861
Loans	24,987	27,924
Commercial real estate
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
Loans	370,501	366,566
Commercial real estate | Owner occupied
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due	220	1,158
90 Days or More Past Due
Nonaccrual Loans	4,005	3,988
Total Past Due	4,225	5,146
Loans Not Past Due	223,816	224,217
Loans	228,041	229,363
Commercial real estate | Non Owner occupied
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due	650	226
90 Days or More Past Due		127
Nonaccrual Loans	2,381	2,775
Total Past Due	3,031	3,128
Loans Not Past Due	139,429	134,075
Loans	142,460	137,203
Residential real estate
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
Loans	245,609	229,161
Residential real estate | Secured by first liens
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due	212	2,207
90 Days or More Past Due
Nonaccrual Loans	4,017	3,192
Total Past Due	4,229	5,399
Loans Not Past Due	236,561	218,742
Loans	240,790	224,141
Residential real estate | Secured by junior liens
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due
90 Days or More Past Due
Nonaccrual Loans	347	368
Total Past Due	347	368
Loans Not Past Due	4,472	4,652
Loans	4,819	5,020
Acquisition, development and construction
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
Loans	164,893	184,292
Acquisition, development and construction | Residential
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due
90 Days or More Past Due
Nonaccrual Loans
Total Past Due
Loans Not Past Due	50,788	54,266
Loans	50,788	54,266
Acquisition, development and construction | Other
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due	730	8
90 Days or More Past Due
Nonaccrual Loans	649	2,537
Total Past Due	1,379	2,545
Loans Not Past Due	112,726	127,481
Loans	114,105	130,026
Consumer
Financing Receivable Recorded Investment Credit Quality Indicators [Line Items]
30 - 89 Days Past Due	32	19
90 Days or More Past Due
Nonaccrual Loans	52	33
Total Past Due	84	52
Loans Not Past Due	19,748	18,532
Loans	$ 19,832	$ 18,584