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Loans - Narrative (Details) | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) loan_modification_request loan | Dec. 31, 2020 USD ($) loan | Dec. 31, 2021 USD ($) loan | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net deferred loan costs included in loan balances | $ 7,890,000 | $ 6,931,000 | $ 7,890,000 |
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston | 364,968,000 | 378,183,000 | 364,968,000 |
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston | $ 295,090,000 | $ 259,599,000 | 295,090,000 |
Number of loans | loan | 60 | 74 |  |
Loans | $ 1,647,649,000 | $ 1,476,761,000 | 1,647,649,000 | $ 1,297,075,000
Nonaccrual loans | 5,602,000 | 6,721,000 | 5,602,000 |
Interest income which would have been recognized on these loans, if interest had been accrued | 345,000 | 558,000 |  |
Loans more than 90 days past due accruing interest | 32,000 | 1,505,000 | 32,000 |
Loans to directors, officers and employees | 42,784,000 | 36,880,000 | 42,784,000 |
TDR recorded investment | $ 8,341,000 | $ 11,534,000 | $ 8,341,000 |
Number of loans | loan | 5 | 14 | 5 |
TDR recorded investment more than 30 days past due | $ 349,000 | $ 1,577,000 | $ 349,000 |
Number of loans placed on TDR status in previous 12 months | loan | 1 | 1 |  |
Number of loans | loan | 4 | 3 |  |
Number of TDR loans involved in bankruptcy (loan) | loan | 8 |  | 8 |
Loans classified as TDRs that are involved in bankruptcy | $ 950,000 |  | $ 950,000 |
Number of loans classified as TDRs that were on non-accrual status | loan | 20 |  | 20 |
Loans classified as TDRs that were on non-accrual status | $ 1,894,000 |  | $ 1,894,000 |
Loans classified as TDRs that are involved in foreclosure | $ 0 |  | $ 0 |
Number of mortgage loans in the process of foreclosure | loan | 4 | 11 | 4 |
Mortgage loans in the process of foreclosure | $ 367,000 | $ 1,109,000 | $ 367,000 |
Original or Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 2,854,000 |  | $ 2,854,000 |
Percentage of loans receivable, by type | 0.0017 |  | 0.0017 |
Out of Modification | Exemption from Troubled Debt Restructure Designation, CARES Act |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 215,167,000 |  | $ 215,167,000 |
Past due rate | 0.41% |  | 0.41% |
Out of Modification | Exemption from Troubled Debt Restructure Designation, CARES Act | All Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 875,000 |  | $ 875,000 |
PPP1 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of loans | 1,053 | 1,718 |  |
Loans | $ 8,000 | $ 97,755,000 | $ 8,000 |
Percentage of loans receivable, by type | 0.173 |  | 0.173 |
TDR recorded investment | $ 284,813,000 |  | $ 284,813,000 |
PPP2 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of loans | loan | 1,263 |  |  |
Loans | $ 22,025,000 |  | 22,025,000 |
Cumulative amount granted |  |  | $ 52,053,000 |

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