Loans - Information on nonaccrual loans (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 1,359,000	$ 1,577,000
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	286,000	303,000
Commercial real estate | Non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	286,000	303,000
Consumer real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,054,000	1,247,000
Consumer real estate | Home equity lines
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	300,000	300,000
Consumer real estate | First deed of trust
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	556,000	630,000
Consumer real estate | Second deed of trust
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	198,000	317,000
Commercial and industrial loans | Commercial and industrial loans (except those secured by real estate)
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 19,000	$ 27,000