Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 15,521	$ 16,253
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	5,367	5,178
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	746	662
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,830	3,438
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	157	171
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	148	102
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,733	2,579
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	925	1,211
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	833	778
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,782	2,134
Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	576	462
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	42	112
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	16	18
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	381	169
Specific Reserves on Loans Evaluated Individually for Impairment | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	137	163
Specific Reserves on Loans Evaluated Individually for Impairment | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,856	1,862
General Reserves on Loans Based on Historical Loss Experience | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	831	721
General Reserves on Loans Based on Historical Loss Experience | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	114	92
General Reserves on Loans Based on Historical Loss Experience | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	382	465
General Reserves on Loans Based on Historical Loss Experience | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
General Reserves on Loans Based on Historical Loss Experience | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	10	6
General Reserves on Loans Based on Historical Loss Experience | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	175	145
General Reserves on Loans Based on Historical Loss Experience | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	101	151
General Reserves on Loans Based on Historical Loss Experience | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	243	282
General Reserves on Loans Based on Historical Loss Experience | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	11,307	11,795
Reserves for Qualitative Factors | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	4,494	4,345
Reserves for Qualitative Factors | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	616	552
Reserves for Qualitative Factors | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,067	2,804
Reserves for Qualitative Factors | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	157	171
Reserves for Qualitative Factors | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	138	96
Reserves for Qualitative Factors | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,421	2,271
Reserves for Qualitative Factors | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	824	1,060
Reserves for Qualitative Factors | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	590	496
Reserves for Qualitative Factors | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,782	2,134
Unallocated Reserves | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,782	$ 2,134