Loans and Allowance - Current, past due, and non-accrual loans by categories of loans and restructured loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 247,040	$ 279,768
Non-accrual	4,512	4,127	$ 1,947
Total	253,772	284,738
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,201	822
Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	18	21
Residential Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	73,715	80,192
Non-accrual	171	728	956
Total	75,653	81,033
Residential Real estate | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,749	92
Residential Real estate | Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	18	21
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	11,414	11,865
Non-accrual	134	137	186
Total	11,548	12,076
Consumer | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		74
Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	74,014	101,605
Non-accrual	178	123	116
Total	74,644	102,384
Indirect | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	452	656
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	14,121	11,907
Non-accrual			27
Total	14,121	11,907
Commercial | Real Estate Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	62,965	70,882
Non-accrual	4,029	3,139	$ 662
Total	66,994	74,021
Commercial | SBA PPP Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	9,912
Total	9,912
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	900	3,317
Total	$ 900	$ 3,317