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Loans and Allowance for Loan Losses - Impaired and Related Allowance (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | $ 1,797,000 |  | $ 1,797,000 |  | $ 1,066,000
With a specific allowance recorded | 11,970,000 |  | 11,970,000 |  | 10,434,000
Total recorded investment in impaired loans | 13,767,000 |  | 13,767,000 |  | 11,500,000
Unpaid principal balance of impaired loans | 13,760,000 |  | 13,760,000 |  | 11,471,000
Specific allowance | 1,106,000 |  | 1,106,000 |  | 397,000
Average recorded investment in impaired loans during the period | 12,833,000 | $ 12,327,000 | 12,475,000 | $ 13,609,000 |
Interest income recognized on impaired loans during the period ended | 115,000 | 522,000 | 333,000 | 844,000 |
Interest income, cash basis, recognized on impaired loans during the period | 0 | 393,000 | 0 | 416,000 |
Charge-off amounts on impaired loans |  |  | 0 |  | 0
Outstanding commitments to extend credit on impaired loans | 500,000 |  | 500,000 |  | 534,000
Commercial loans | Commercial and industrial |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 291,000 |  | 291,000 |  | 349,000
With a specific allowance recorded | 726,000 |  | 726,000 |  | 874,000
Total recorded investment in impaired loans | 1,017,000 |  | 1,017,000 |  | 1,223,000
Unpaid principal balance of impaired loans | 1,012,000 |  | 1,012,000 |  | 1,209,000
Specific allowance | 19,000 |  | 19,000 |  | 103,000
Average recorded investment in impaired loans during the period | 798,000 | 1,324,000 | 948,000 | 1,495,000 |
Interest income recognized on impaired loans during the period ended | 11,000 | 16,000 | 32,000 | 56,000 |
Commercial real estate loans | Commercial real estate, owner-occupied |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 0 |  | 0 |  | 0
With a specific allowance recorded | 7,003,000 |  | 7,003,000 |  | 6,998,000
Total recorded investment in impaired loans | 7,003,000 |  | 7,003,000 |  | 6,998,000
Unpaid principal balance of impaired loans | 6,993,000 |  | 6,993,000 |  | 6,992,000
Specific allowance | 225,000 |  | 225,000 |  | 195,000
Average recorded investment in impaired loans during the period | 7,002,000 | 7,000,000 | 7,000,000 | 6,998,000 |
Interest income recognized on impaired loans during the period ended | 64,000 | 67,000 | 197,000 | 199,000 |
Commercial real estate loans | Commercial real estate, investor-owned |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 885,000 |  | 885,000 |  | 0
With a specific allowance recorded | 3,310,000 |  | 3,310,000 |  | 1,770,000
Total recorded investment in impaired loans | 4,195,000 |  | 4,195,000 |  | 1,770,000
Unpaid principal balance of impaired loans | 4,187,000 |  | 4,187,000 |  | 1,764,000
Specific allowance | 697,000 |  | 697,000 |  | 41,000
Average recorded investment in impaired loans during the period | 3,430,000 | 1,791,000 | 2,832,000 | 1,804,000 |
Interest income recognized on impaired loans during the period ended | 30,000 | 20,000 | 68,000 | 59,000 |
Commercial real estate loans | Construction |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 0 |  | 0 |  | 0
With a specific allowance recorded | 0 |  | 0 |  | 0
Total recorded investment in impaired loans | 0 |  | 0 |  | 0
Unpaid principal balance of impaired loans | 0 |  | 0 |  | 0
Specific allowance | 0 |  | 0 |  | 0
Average recorded investment in impaired loans during the period | 0 | 684,000 | 0 | 1,687,000 |
Interest income recognized on impaired loans during the period ended | 0 | 400,000 | 0 | 456,000 |
Residential loans | Home equity |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 532,000 |  | 532,000 |  | 167,000
With a specific allowance recorded | 251,000 |  | 251,000 |  | 251,000
Total recorded investment in impaired loans | 783,000 |  | 783,000 |  | 418,000
Unpaid principal balance of impaired loans | 801,000 |  | 801,000 |  | 417,000
Specific allowance | 4,000 |  | 4,000 |  | 5,000
Average recorded investment in impaired loans during the period | 829,000 | 413,000 | 740,000 | 497,000 |
Interest income recognized on impaired loans during the period ended | 3,000 | 9,000 | 10,000 | 42,000 |
Residential loans | Other residential |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 0 |  | 0 |  | 452,000
With a specific allowance recorded | 0 |  | 0 |  | 0
Total recorded investment in impaired loans | 0 |  | 0 |  | 452,000
Unpaid principal balance of impaired loans | 0 |  | 0 |  | 451,000
Specific allowance | 0 |  | 0 |  | 0
Average recorded investment in impaired loans during the period | 0 | 456,000 | 225,000 | 458,000 |
Interest income recognized on impaired loans during the period ended | 0 | 4,000 | 4,000 | 14,000 |
Consumer loans | Installment and other consumer |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 89,000 |  | 89,000 |  | 98,000
With a specific allowance recorded | 680,000 |  | 680,000 |  | 541,000
Total recorded investment in impaired loans | 769,000 |  | 769,000 |  | 639,000
Unpaid principal balance of impaired loans | 767,000 |  | 767,000 |  | 638,000
Specific allowance | 161,000 |  | 161,000 |  | $ 53,000
Average recorded investment in impaired loans during the period | 774,000 | 659,000 | 730,000 | 670,000 |
Interest income recognized on impaired loans during the period ended | $ 7,000 | $ 6,000 | $ 22,000 | $ 18,000 |

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