Loans and Allowance for Loan Losses - Past Due and Non-accrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	$ 217	$ 162
Non-Accrual	5,623	5,414
Loans	1,156,943	1,146,627
Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	1,148,174	1,136,236
30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	2,929	4,815
Commercial, financial, and agricultural
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	0	0
Non-Accrual	1,541	1,857
Loans	201,232	207,720
Commercial, financial, and agricultural | Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	199,298	205,597
Commercial, financial, and agricultural | 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	393	266
Residential real estate | Construction
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	0	0
Non-Accrual	0	0
Loans	24,527	28,610
Residential real estate | Construction | Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	24,527	28,404
Residential real estate | Construction | 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	0	206
Residential real estate | Mortgages
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	197	156
Non-Accrual	2,603	2,720
Loans	248,980	241,517
Residential real estate | Mortgages | Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	245,305	235,734
Residential real estate | Mortgages | 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	875	2,907
Commercial real estate | Construction
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	0	0
Non-Accrual	146	153
Loans	120,931	106,784
Commercial real estate | Construction | Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	120,314	106,531
Commercial real estate | Construction | 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	471	100
Commercial real estate | Mortgages
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	0	0
Non-Accrual	1,155	474
Loans	529,217	529,536
Commercial real estate | Mortgages | Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	527,069	527,968
Commercial real estate | Mortgages | 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	993	1,094
Installment and other consumer
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	20	6
Non-Accrual	178	210
Loans	32,056	32,460
Installment and other consumer | Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	31,661	32,002
Installment and other consumer | 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	$ 197	$ 242