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Allowance for Loan Losses (the Allowance) - Impaired loans (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Impaired loans with related allowance: |  |
Recorded investment | $ 4,374 | $ 4,644
Principal balance | 4,508 | 4,696
Related allowance | 1,916 | 1,645
Impaired loans without related allowance: |  |
Recorded investment | 6,820 | 5,736
Principal balance | 6,899 | 5,862
Grand Total |  |
Recorded investment | 11,194 | 10,380
Principal balance | 11,407 | 10,558
Related allowance | 1,916 | 1,645
Commercial mortgage |  |
Impaired loans without related allowance: |  |
Recorded investment | 2,568 | 1,606
Principal balance | 2,568 | 1,642
Commercial and industrial |  |
Impaired loans with related allowance: |  |
Recorded investment | 3,201 | 3,860
Principal balance | 3,321 | 3,902
Related allowance | 1,526 | 1,563
Impaired loans without related allowance: |  |
Recorded investment | 450 | 785
Principal balance | 515 | 862
Small business loans |  |
Impaired loans with related allowance: |  |
Recorded investment | 916 |
Principal balance | 916 |
Related allowance | 376 |
Impaired loans without related allowance: |  |
Recorded investment | 141 | 185
Principal balance | 141 | 185
Home equity lines and loans |  |
Impaired loans with related allowance: |  |
Recorded investment | 88 | 95
Principal balance | 102 | 105
Related allowance | 2 | 9
Impaired loans without related allowance: |  |
Recorded investment | 822 | 826
Principal balance | 836 | 839
Residential mortgage |  |
Impaired loans with related allowance: |  |
Recorded investment | 169 | 689
Principal balance | 169 | 689
Related allowance | 12 | 73
Impaired loans without related allowance: |  |
Recorded investment | 1,633 | 1,128
Principal balance | 1,633 | 1,128
Construction |  |
Impaired loans without related allowance: |  |
Recorded investment | 1,206 | 1,206
Principal balance | $ 1,206 | $ 1,206

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