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Loans and Allowance for Loan Losses - Impaired and Related Allowance (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($) loan | Dec. 31, 2018 USD ($)
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | $ 1,098,000 |  | $ 1,098,000 |  | $ 3,877,000
With a specific allowance recorded | 11,253,000 |  | 11,253,000 |  | 11,161,000
Total recorded investment in impaired loans | 12,351,000 |  | 12,351,000 |  | 15,038,000
Unpaid principal balance of impaired loans | 12,307,000 |  | 12,307,000 |  | 15,013,000
Specific allowance | 389,000 |  | 389,000 |  | 778,000
Average recorded investment in impaired loans during the period | 12,327,000 | $ 15,705,000 | 13,609,000 | $ 16,212,000 |
Interest income recognized on impaired loans during the period ended | 522,000 | 182,000 | 844,000 | 665,000 |
Interest income recognized on impaired loans during the period ended, cash basis | 393,000 | 6,000 | $ 416,000 | 134,000 |
Number of impaired loans with interest income recognized | loan |  |  | 3 |  |
Charge-off amounts on impaired loans |  |  | $ 0 |  | 0
Outstanding commitments to extend credit on impaired loans | 699,000 |  | 699,000 |  | 1,100,000
Commercial loans | Commercial and industrial |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 375,000 |  | 375,000 |  | 303,000
With a specific allowance recorded | 785,000 |  | 785,000 |  | 1,522,000
Total recorded investment in impaired loans | 1,160,000 |  | 1,160,000 |  | 1,825,000
Unpaid principal balance of impaired loans | 1,140,000 |  | 1,140,000 |  | 1,813,000
Specific allowance | 183,000 |  | 183,000 |  | 466,000
Average recorded investment in impaired loans during the period | 1,324,000 | 1,840,000 | 1,495,000 | 2,019,000 |
Interest income recognized on impaired loans during the period ended | 16,000 | 31,000 | 56,000 | 214,000 |
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 | 6,999,000 |  | 6,999,000 |  | 6,993,000
Total recorded investment in impaired loans | 6,999,000 |  | 6,999,000 |  | 6,993,000
Unpaid principal balance of impaired loans | 6,993,000 |  | 6,993,000 |  | 6,993,000
Specific allowance | 85,000 |  | 85,000 |  | 189,000
Average recorded investment in impaired loans during the period | 7,000,000 | 7,000,000 | 6,998,000 | 7,002,000 |
Interest income recognized on impaired loans during the period ended | 67,000 | 67,000 | 199,000 | 199,000 |
Commercial real estate loans | Commercial real estate, investor |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 0 |  | 0 |  | 0
With a specific allowance recorded | 1,786,000 |  | 1,786,000 |  | 1,821,000
Total recorded investment in impaired loans | 1,786,000 |  | 1,786,000 |  | 1,821,000
Unpaid principal balance of impaired loans | 1,776,000 |  | 1,776,000 |  | 1,812,000
Specific allowance | 45,000 |  | 45,000 |  | 45,000
Average recorded investment in impaired loans during the period | 1,791,000 | 1,837,000 | 1,804,000 | 1,925,000 |
Interest income recognized on impaired loans during the period ended | 20,000 | 20,000 | 59,000 | 63,000 |
Commercial real estate loans | Construction |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 0 |  | 0 |  | 2,688,000
With a specific allowance recorded | 880,000 |  | 880,000 |  | 0
Total recorded investment in impaired loans | 880,000 |  | 880,000 |  | 2,688,000
Unpaid principal balance of impaired loans | 876,000 |  | 876,000 |  | 2,688,000
Specific allowance | 12,000 |  | 12,000 |  | 0
Average recorded investment in impaired loans during the period | 684,000 | 2,690,000 | 1,687,000 | 2,831,000 |
Interest income recognized on impaired loans during the period ended | 400,000 | 39,000 | 456,000 | 114,000 |
Residential loans | Home equity |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 168,000 |  | 168,000 |  | 313,000
With a specific allowance recorded | 251,000 |  | 251,000 |  | 251,000
Total recorded investment in impaired loans | 419,000 |  | 419,000 |  | 564,000
Unpaid principal balance of impaired loans | 417,000 |  | 417,000 |  | 562,000
Specific allowance | 5,000 |  | 5,000 |  | 5,000
Average recorded investment in impaired loans during the period | 413,000 | 651,000 | 497,000 | 698,000 |
Interest income recognized on impaired loans during the period ended | 9,000 | 5,000 | 42,000 | 15,000 |
Residential loans | Other residential |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 454,000 |  | 454,000 |  | 462,000
With a specific allowance recorded | 0 |  | 0 |  | 0
Total recorded investment in impaired loans | 454,000 |  | 454,000 |  | 462,000
Unpaid principal balance of impaired loans | 453,000 |  | 453,000 |  | 461,000
Specific allowance | 0 |  | 0 |  | 0
Average recorded investment in impaired loans during the period | 456,000 | 987,000 | 458,000 | 1,029,000 |
Interest income recognized on impaired loans during the period ended | 4,000 | 13,000 | 14,000 | 38,000 |
Consumer loans | Installment and other consumer |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 101,000 |  | 101,000 |  | 111,000
With a specific allowance recorded | 552,000 |  | 552,000 |  | 574,000
Total recorded investment in impaired loans | 653,000 |  | 653,000 |  | 685,000
Unpaid principal balance of impaired loans | 652,000 |  | 652,000 |  | 684,000
Specific allowance | 59,000 |  | 59,000 |  | $ 73,000
Average recorded investment in impaired loans during the period | 659,000 | 700,000 | 670,000 | 708,000 |
Interest income recognized on impaired loans during the period ended | $ 6,000 | $ 7,000 | $ 18,000 | $ 22,000 |
Purchased credit-impaired | Commercial loans |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
Number of impaired loans with interest income recognized | loan |  |  |  | 3 |

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