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Allowance for Loan Losses (the Allowance) - Impaired loans (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Impaired loans with related allowance: |  |
Recorded investment | $ 5,489 | $ 4,644
Principal balance | 5,575 | 4,696
Related allowance | 2,018 | 1,645
Impaired loans without related allowance: |  |
Recorded investment | 4,737 | 5,736
Principal balance | 4,832 | 5,862
Grand Total |  |
Recorded investment | 10,226 | 10,380
Principal balance | 10,407 | 10,558
Related allowance | 2,018 | 1,645
Commercial mortgage |  |
Impaired loans without related allowance: |  |
Recorded investment | 730 | 1,606
Principal balance | 730 | 1,642
Commercial and industrial, including leases |  |
Impaired loans with related allowance: |  |
Recorded investment | 3,790 | 3,860
Principal balance | 3,866 | 3,902
Related allowance | 1,562 | 1,563
Impaired loans without related allowance: |  |
Recorded investment | 549 | 785
Principal balance | 630 | 862
Small business loans |  |
Impaired loans with related allowance: |  |
Recorded investment | 917 |
Principal balance | 917 |
Related allowance | 376 |
Impaired loans without related allowance: |  |
Recorded investment | 170 | 185
Principal balance | 170 | 185
Home equity lines and loans |  |
Impaired loans with related allowance: |  |
Recorded investment | 94 | 95
Principal balance | 104 | 105
Related allowance | 8 | 9
Impaired loans without related allowance: |  |
Recorded investment | 825 | 826
Principal balance | 839 | 839
Residential mortgage |  |
Impaired loans with related allowance: |  |
Recorded investment | 688 | 689
Principal balance | 688 | 689
Related allowance | 72 | 73
Impaired loans without related allowance: |  |
Recorded investment | 1,126 | 1,128
Principal balance | 1,126 | 1,128
Construction |  |
Impaired loans without related allowance: |  |
Recorded investment | 1,206 | 1,206
Principal balance | 1,206 | $ 1,206
Leases |  |
Impaired loans with related allowance: |  |
Recorded investment | 131 |
Principal balance | $ 131 |

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