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Allowance for Loan Losses (the Allowance) - Impaired Loan Average Recorded Investment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Impaired loans with related allowance: |  |  |  |
Average recorded investment | $ 4,416 | $ 4,007 | $ 4,485 | $ 1,869
Interest income recognized | 5 | 26 | 15 | 36
Impaired loans without related allowance: |  |  |  |
Average recorded investment | 6,858 | 6,581 | 6,953 | 6,034
Interest income recognized | 53 | 113 | 110 | 298
Grand Total |  |  |  |
Average recorded investment | 11,274 | 10,588 | 11,438 | 7,903
Total interest income recognized | 58 | 139 | 125 | 334
Commercial mortgage |  |  |  |
Impaired loans without related allowance: |  |  |  |
Average recorded investment | 2,573 | 2,080 | 2,584 | 1,852
Interest income recognized | 8 | 47 | 24 | 89
Commercial and industrial |  |  |  |
Impaired loans with related allowance: |  |  |  |
Average recorded investment | 3,242 | 3,907 | 3,306 | 1,766
Interest income recognized | 5 | 26 | 15 | 36
Impaired loans without related allowance: |  |  |  |
Average recorded investment | 473 | 874 | 485 | 700
Interest income recognized | 19 | 6 | 19 | 14
Small business loans |  |  |  |
Impaired loans with related allowance: |  |  |  |
Average recorded investment | 916 |  | 917 |
Impaired loans without related allowance: |  |  |  |
Average recorded investment | 147 | 208 | 161 | 220
Interest income recognized | 3 | 5 | 11 | 16
Home equity lines and loans |  |  |  |
Impaired loans with related allowance: |  |  |  |
Average recorded investment | 89 | 100 | 92 | 103
Impaired loans without related allowance: |  |  |  |
Average recorded investment | 823 | 564 | 824 | 575
Residential mortgage |  |  |  |
Impaired loans with related allowance: |  |  |  |
Average recorded investment | 169 |  | 170 |
Impaired loans without related allowance: |  |  |  |
Average recorded investment | 1,636 | 1,649 | 1,640 | 1,478
Interest income recognized | 6 | 41 | 9 | 133
Construction |  |  |  |
Impaired loans without related allowance: |  |  |  |
Average recorded investment | 1,206 | 1,206 | 1,206 | 1,209
Interest income recognized | $ 17 | $ 14 | 47 | $ 46
Leases, net |  |  |  |
Impaired loans without related allowance: |  |  |  |
Average recorded investment |  |  | $ 53 |

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