Loans - Aging of recorded investment in past due loans and leases (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 526,457	$ 561,003
Recorded Investment, 90 Days and Accruing	1,961	2,193
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	521,718	556,071
Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	4,739	4,932
30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,987	1,673
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	791	1,066
Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,961	2,193
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	3,003	2,885
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	49,149	29,569
Construction and land development | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	49,149	29,569
Construction and land development | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	6,805	8,103
Construction and land development | Residential | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	6,805	8,103
Construction and land development | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	42,344	21,466
Construction and land development | Commercial | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	42,344	21,466
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	255,537	231,224
Commercial real estate | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	255,537	231,138
Commercial real estate | Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		86
Commercial real estate | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		86
Commercial real estate | Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	113,108	99,784
Commercial real estate | Owner occupied | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	113,108	99,698
Commercial real estate | Owner occupied | Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		86
Commercial real estate | Owner occupied | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		86
Commercial real estate | Non-owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	129,786	121,184
Commercial real estate | Non-owner occupied | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	129,786	121,184
Commercial real estate | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	11,666	9,889
Commercial real estate | Multifamily | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	11,666	9,889
Commercial real estate | Farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	977	367
Commercial real estate | Farmland | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	977	367
Consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	92,372	86,580
Consumer real estate | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	92,372	86,390
Consumer real estate | Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		190
Consumer real estate | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		133
Consumer real estate | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		57
Consumer real estate | Home equity lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	17,977	18,394
Consumer real estate | Home equity lines | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	17,977	18,394
Consumer real estate | First deed of trust
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	62,277	57,089
Consumer real estate | First deed of trust | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	62,277	56,956
Consumer real estate | First deed of trust | Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		133
Consumer real estate | First deed of trust | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		133
Consumer real estate | Second deed of trust
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	12,118	11,097
Consumer real estate | Second deed of trust | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	12,118	11,040
Consumer real estate | Second deed of trust | Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		57
Consumer real estate | Second deed of trust | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		57
Commercial and industrial loans | Commercial and industrial loans (except those secured by real estate)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	100,421	181,088
Commercial and industrial loans | Commercial and industrial loans (except those secured by real estate) | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	99,390	181,063
Commercial and industrial loans | Commercial and industrial loans (except those secured by real estate) | Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,031	25
Commercial and industrial loans | Commercial and industrial loans (except those secured by real estate) | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,031	25
Commercial and industrial loans | Guaranteed student loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	25,975	29,657
Recorded Investment, 90 Days and Accruing	1,961	2,193
Commercial and industrial loans | Guaranteed student loans | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	22,267	25,027
Commercial and industrial loans | Guaranteed student loans | Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	3,708	4,630
Commercial and industrial loans | Guaranteed student loans | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	956	1,428
Commercial and industrial loans | Guaranteed student loans | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	791	1,009
Commercial and industrial loans | Guaranteed student loans | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,961	2,193
Commercial and industrial loans | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	3,003	2,885
Commercial and industrial loans | Consumer and other | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 3,003	2,884
Commercial and industrial loans | Consumer and other | Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		1
Commercial and industrial loans | Consumer and other | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		$ 1