Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,647,649	$ 1,476,761	$ 1,297,075
Percentage of loans receivable, by type	100.00%	100.00%
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 576,198	$ 442,121	372,810
Percentage of loans receivable, by type	35.00%	29.90%
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 79,365	$ 56,565	38,084
Percentage of loans receivable, by type	4.80%	3.80%
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 264,570	$ 285,015	218,773
Percentage of loans receivable, by type	16.10%	19.30%
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 48,362	$ 43,783	41,288
Percentage of loans receivable, by type	2.90%	3.00%
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 31,763	$ 21,600	14,813
Percentage of loans receivable, by type	1.90%	1.50%
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 550,783	$ 522,070	492,455
Percentage of loans receivable, by type	33.40%	35.30%
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 73,632	$ 79,750	92,349
Percentage of loans receivable, by type	4.50%	5.40%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 22,976	$ 25,857	$ 26,503
Percentage of loans receivable, by type	1.40%	1.80%