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Loans and Allowance for Loan Losses - Impaired and Related Allowance (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) loan | Dec. 31, 2018 USD ($)
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | $ 3,934,000 |  | $ 3,877,000
With a specific allowance recorded | 10,809,000 |  | 11,161,000
Total recorded investment in impaired loans | 14,743,000 |  | 15,038,000
Unpaid principal balance of impaired loans | 14,698,000 |  | 15,013,000
Specific allowance | 704,000 |  | 778,000
Average recorded investment in impaired loans during the period | 14,890,000 | $ 16,736,000 |
Interest income recognized on impaired loans during the period ended | 165,000 | 306,000 |
Interest income recognized on impaired loans during the period ended, cash basis | 0 | 128,000 |
Charge-off amounts on impaired loans | 0 |  | 0
Outstanding commitments to extend credit on impaired loans | 1,400,000 |  | 1,100,000
Commercial loans | Commercial and industrial |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 328,000 |  | 303,000
With a specific allowance recorded | 1,179,000 |  | 1,522,000
Total recorded investment in impaired loans | 1,507,000 |  | 1,825,000
Unpaid principal balance of impaired loans | 1,489,000 |  | 1,813,000
Specific allowance | 424,000 |  | 466,000
Average recorded investment in impaired loans during the period | 1,666,000 | 2,216,000 |
Interest income recognized on impaired loans during the period ended | 22,000 | 155,000 |
Commercial real estate loans | Commercial real estate, owner-occupied |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 0 |  | 0
With a specific allowance recorded | 7,001,000 |  | 6,993,000
Total recorded investment in impaired loans | 7,001,000 |  | 6,993,000
Unpaid principal balance of impaired loans | 6,993,000 |  | 6,993,000
Specific allowance | 161,000 |  | 189,000
Average recorded investment in impaired loans during the period | 6,997,000 | 7,003,000 |
Interest income recognized on impaired loans during the period ended | 66,000 | 66,000 |
Commercial real estate loans | Commercial real estate, investor |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 0 |  | 0
With a specific allowance recorded | 1,812,000 |  | 1,821,000
Total recorded investment in impaired loans | 1,812,000 |  | 1,821,000
Unpaid principal balance of impaired loans | 1,801,000 |  | 1,812,000
Specific allowance | 47,000 |  | 45,000
Average recorded investment in impaired loans during the period | 1,816,000 | 2,012,000 |
Interest income recognized on impaired loans during the period ended | 20,000 | 22,000 |
Commercial real estate loans | Construction |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 2,691,000 |  | 2,688,000
With a specific allowance recorded | 0 |  | 0
Total recorded investment in impaired loans | 2,691,000 |  | 2,688,000
Unpaid principal balance of impaired loans | 2,687,000 |  | 2,688,000
Specific allowance | 0 |  | 0
Average recorded investment in impaired loans during the period | 2,690,000 | 2,972,000 |
Interest income recognized on impaired loans during the period ended | 42,000 | 38,000 |
Residential loans | Home equity |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 346,000 |  | 313,000
With a specific allowance recorded | 251,000 |  | 251,000
Total recorded investment in impaired loans | 597,000 |  | 564,000
Unpaid principal balance of impaired loans | 595,000 |  | 562,000
Specific allowance | 5,000 |  | 5,000
Average recorded investment in impaired loans during the period | 580,000 | 746,000 |
Interest income recognized on impaired loans during the period ended | 4,000 | 5,000 |
Residential loans | Other residential |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 460,000 |  | 462,000
With a specific allowance recorded | 0 |  | 0
Total recorded investment in impaired loans | 460,000 |  | 462,000
Unpaid principal balance of impaired loans | 459,000 |  | 461,000
Specific allowance | 0 |  | 0
Average recorded investment in impaired loans during the period | 461,000 | 1,070,000 |
Interest income recognized on impaired loans during the period ended | 5,000 | 13,000 |
Consumer loans | Installment and other consumer |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 109,000 |  | 111,000
With a specific allowance recorded | 566,000 |  | 574,000
Total recorded investment in impaired loans | 675,000 |  | 685,000
Unpaid principal balance of impaired loans | 674,000 |  | 684,000
Specific allowance | 67,000 |  | $ 73,000
Average recorded investment in impaired loans during the period | 680,000 | 717,000 |
Interest income recognized on impaired loans during the period ended | $ 6,000 | $ 7,000 |
Purchased credit-impaired | Commercial loans |  |  |
Recorded investment in impaired loans: |  |  |
Number of impaired loans with interest income recognized | loan |  | 2 |

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