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Loans - Narrative (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($)
Schedule of Financing Receivables [Line Items] |  |  |
Net deferred loan costs included in loan balances | $ 6,931 | $ 7,419 |
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston | 378,183 | 296,871 |
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston | $ 259,599 | $ 240,133 |
Number of loans | loan | 74 | 81 |
Loans | $ 1,476,761 | $ 1,297,075 | $ 1,238,283
Forgiveness payments received | 1,661 | 1,120 | $ 1,273
Nonaccrual loans | 6,721 | 16,649 |
Interest income which would have been recognized on these loans, if interest had been accrued | 558 | 906 |
Loans more than 90 days past due accruing interest | 1,505 | 1,560 |
Loans to directors, officers and employees | 36,880 | 35,071 |
Amounts past due | 9,722 | 15,017 |
TDR recorded investment | $ 11,534 | $ 21,424 |
Number of loans | loan | 14 | 13 |
TDR recorded investment more than 30 days past due | $ 1,577 | $ 1,510 |
Number of loans placed on TDR status in previous 12 months | loan | 1 | 2 |
Number of loans | loan | 3 | 11 |
Loans classified as TDRs that are involved in bankruptcy | $ 810 |  |
Number of loans classified as TDRs that were on non-accrual status | loan | 22 |  |
Loans classified as TDRs that were on non-accrual status | $ 2,216 |  |
Number of loans classified as TDRs that are involved in foreclosure | loan | 2 |  |
Loans classified as TDRs that are involved in foreclosure | $ 254 |  |
Number of mortgage loans in the process of foreclosure | loan | 11 | 14 |
Mortgage loans in the process of foreclosure | $ 1,109 | $ 1,502 |
Original or Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Loans | $ 62,208 |  |
Percentage of loans receivable, by type | 0.042 |  |
Out of Modification | Exemption from Troubled Debt Restructure Designation, CARES Act |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Loans | $ 213,819 |  |
Amounts past due | $ 972 |  |
Past due rate | 0.45% |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Number of loans | loan | 1,718 |  |
Loans | $ 97,566 |  |
Forgiveness payments received | $ 37,000 |  |
Small Business Administration (SBA), CARES Act, Excluding Paycheck Protection Program |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Number of loans | loan | 1,031 |  |
Loans | $ 291,100 |  |
Percentage of loans receivable, by type | 0.196 |  |
Loans Receivable in Bankruptcy |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Number of loans | loan | 7 |  |

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