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Loans - Narrative (Details)	1 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($) loan	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred loan costs included in loan balances		$ 10,132,000	$ 7,890,000
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston		475,233,000	364,968,000
Net loans		$ 1,897,951,000	$ 1,632,128,000
Number of loans sold | loan	41
Balance of loans sold	$ 5,200,000
Number of loans | loan		29	60
Loans		$ 1,914,674,000	$ 1,647,649,000
Nonaccrual loans		1,755,000	5,602,000
Interest income which would have been recognized on these loans, if interest had been accrued		223,000	345,000
Loans more than 90 days past due accruing interest		241,000	32,000
Loans to directors, officers and employees		48,001,000	42,784,000
TDR recorded investment		$ 4,744,000	$ 8,341,000
Number of loans | loan		1	5
TDR recorded investment more than 30 days past due		$ 97,000	$ 349,000
Number of loans placed on TDR status in previous 12 months | loan			1
Number of loans | loan		1	4
Number of TDR loans involved in bankruptcy (loan) | loan		4
Loans classified as TDRs that are involved in bankruptcy		$ 550,000
Number of loans classified as TDRs that were on non-accrual status | loan		5
Loans classified as TDRs that were on non-accrual status		$ 339,000
Loans classified as TDRs that are involved in foreclosure		$ 0
Number of mortgage loans in the process of foreclosure | loan		2	4
Mortgage loans in the process of foreclosure		$ 166,000	$ 367,000
Small Business Administration (SBA), CARES Act, Excluding Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan			18
Loans			$ 2,900,000
Percentage of loans receivable, by type			0.0017
Small Business Administration (SBA), CARES Act, Excluding Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan				1,718
Loans				$ 97,755,000
Small Business Administration (SBA), CARES Act, Paycheck Protection Program 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan			1,263
Loans		12,000	$ 52,053,000
Loans pledged as collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net loans		$ 338,636,000	$ 295,090,000

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