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Allowance for Loan Losses (the Allowance) - Impaired Loan Average Recorded Investment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Impaired loans with related allowance: |  |
Average recorded investment | $ 5,527 | $ 909
Interest income recognized | 5 | 5
Impaired loans without related allowance: |  |
Average recorded investment | 4,770 | 9,000
Interest income recognized | 27 | 48
Grand Total |  |
Average recorded investment | 10,297 | 9,909
Total interest income recognized on impaired loans | 32 | 53
Commercial mortgage |  |
Impaired loans without related allowance: |  |
Average recorded investment | 735 | 2,129
Interest income recognized | 8 | 21
Commercial and industrial, including leases |  |
Impaired loans with related allowance: |  |
Average recorded investment | 3,826 | 451
Interest income recognized | 5 | 5
Impaired loans without related allowance: |  |
Average recorded investment | 579 | 587
Interest income recognized |  | 4
Small business loans |  |
Impaired loans with related allowance: |  |
Average recorded investment | 918 |
Impaired loans without related allowance: |  |
Average recorded investment | 176 | 934
Interest income recognized | 4 | 6
Home equity lines and loans |  |
Impaired loans with related allowance: |  |
Average recorded investment | 95 | 458
Impaired loans without related allowance: |  |
Average recorded investment | 825 | 305
Residential mortgage |  |
Impaired loans with related allowance: |  |
Average recorded investment | 688 |
Impaired loans without related allowance: |  |
Average recorded investment | 1,127 | 3,806
Construction |  |
Impaired loans without related allowance: |  |
Average recorded investment | 1,206 | 1,239
Interest income recognized | 15 | $ 17
Leases |  |
Impaired loans without related allowance: |  |
Average recorded investment | $ 122 |

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