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Loans, Allowance for Credit Losses and Credit Quality - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Schedule Of Loans Allowance For Loan Losses And Credit Quality [Line Items]
Carrying value of loans pledged	$ 1,177,543,000		$ 1,136,449,000
Interest income recognized on nonaccrual loans	39,000	$ 15,000
Loan restructurings	0	$ 0
FHLBB | Loans Pledged
Schedule Of Loans Allowance For Loan Losses And Credit Quality [Line Items]
Carrying value of loans pledged	731,200,000		744,600,000
Commercial And Industrial Loans
Schedule Of Loans Allowance For Loan Losses And Credit Quality [Line Items]
Threshold limit for loans receivable	500,000
Commercial Real Estate Loans
Schedule Of Loans Allowance For Loan Losses And Credit Quality [Line Items]
Threshold limit for loans receivable	2,000,000
Residential Real Estate
Schedule Of Loans Allowance For Loan Losses And Credit Quality [Line Items]
Mortgage loans in process of foreclosure	$ 107,000		$ 335,000

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Schedule of loans, allowance for loan losses and credit quality.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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