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Loans - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) loan | Mar. 31, 2020 USD ($) loan | Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net deferred loan costs | $ 5,328 | $ 7,551 | $ 6,931
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston | 362,271 | 401,555 | 378,183
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston | $ 275,993 | $ 260,703 | $ 259,599
Number of loans | loan | 73 | 81 | 74
Loans | $ 1,516,772 | $ 1,344,208 | $ 1,476,761
Percentage of loans receivable, by type | 100.00% | 100.00% | 100.00%
TDR recorded investment | $ 11,306 | $ 14,968 | $ 11,534
Number of loans | loan | 11 | 22 |
TDR recorded investment more than 30 days past due | $ 1,017 | $ 3,622 |
Number of loans placed on TDR status in previous 12 months | loan | 0 | 1 |
Number of loans | loan | 1 | 2 |
Number of TDR loans involved in bankruptcy (loan) | loan | 6 |  |
Loans classified as TDRs that are involved in bankruptcy | $ 708 |  |
Number of loans classified as TDRs that were on non-accrual status | loan | 21 |  |
Loans classified as TDRs that were on non-accrual status | $ 1,908 |  |
Number of loans classified as TDRs that are involved in foreclosure | loan | 1 |  |
Loans classified as TDRs that are involved in foreclosure | $ 92 |  |
Number of mortgage loans in the process of foreclosure | loan | 14 | 15 |
Mortgage loans in the process of foreclosure | $ 1,067 | $ 2,284 |
Unallocated |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 0 | $ 0 | $ 0
Number of days past due | 30 days | 30 days |
Original or Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 50,600 |  |
Percentage of loans receivable, by type | 3.30% |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans | loan | 1,037 |  |
Loans | $ 292,003 |  |
Percentage of loans receivable, by type | 20.00% |  |

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