Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,647,649	$ 1,476,761
90 Plus Days And Accruing	32	1,505
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,548	2,916
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	543	2,417
90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,254	4,389
All Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,345	9,722
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,643,304	1,467,039
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	576,198	442,121
90 Plus Days And Accruing	0	0
Commercial | Real estate | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	249	139
Commercial | Real estate | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	190
Commercial | Real estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	191	226
Commercial | Real estate | All Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	440	555
Commercial | Real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	575,758	441,566
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	79,365	56,565
90 Plus Days And Accruing	0	0
Commercial | Construction | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	12	13
Commercial | Construction | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Commercial | Construction | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	12	80
Commercial | Construction | All Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	24	93
Commercial | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	79,341	56,472
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	264,570	285,015
90 Plus Days And Accruing	0	1,464
Commercial | Other | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	30	490
Commercial | Other | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	23	62
Commercial | Other | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	104	2,082
Commercial | Other | All Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	157	2,634
Commercial | Other | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	264,413	282,381
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	48,362	43,783
90 Plus Days And Accruing	0	0
Municipal | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Municipal | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Municipal | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Municipal | All Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Municipal | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	48,362	43,783
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	31,763	21,600
90 Plus Days And Accruing	0	0
Residential | Construction | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Residential | Construction | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Residential | Construction | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Residential | Construction | All Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Residential | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	31,763	21,600
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	550,783	522,070
90 Plus Days And Accruing	0	23
Residential | Term | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	348	540
Residential | Term | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	169	1,799
Residential | Term | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,780	1,616
Residential | Term | All Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,297	3,955
Residential | Term | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	548,486	518,115
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	73,632	79,750
90 Plus Days And Accruing	0	0
Home equity line of credit | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	741	1,645
Home equity line of credit | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	159	324
Home equity line of credit | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	135	367
Home equity line of credit | All Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,035	2,336
Home equity line of credit | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	72,597	77,414
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	22,976	25,857
90 Plus Days And Accruing	32	18
Consumer | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	168	89
Consumer | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	192	42
Consumer | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	32	18
Consumer | All Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	392	149
Consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 22,584	$ 25,708