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Loans and Allowance for Loan Losses - Impaired and Related Allowance (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | $ 4,429,000 |  | $ 4,445,000
With a specific allowance recorded | 12,118,000 |  | 12,481,000
Total recorded investment in impaired loans | 16,547,000 |  | 16,926,000
Unpaid principal balance of impaired loans | 16,500,000 |  | 17,019,000
Specific allowance | 354,000 |  | 513,000
Average recorded investment in impaired loans during the period | 16,736,000 | $ 18,384,000 |
Interest income recognized on impaired loans during the period ended | 306,000 | 183,000 |
Interest income recognized on impaired loans during the period ended, cash basis | 128,000 | 0 |
Outstanding commitments to extend credit on impaired loans | 610,000 |  | 935,000
Commercial loans | Commercial and industrial |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 307,000 |  | 309,000
With a specific allowance recorded | 1,960,000 |  | 1,856,000
Total recorded investment in impaired loans | 2,267,000 |  | 2,165,000
Unpaid principal balance of impaired loans | 2,260,000 |  | 2,278,000
Specific allowance | 35,000 |  | 50,000
Average recorded investment in impaired loans during the period | 2,216,000 | 2,138,000 |
Interest income recognized on impaired loans during the period ended | 155,000 | 23,000 |
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 | 7,007,000 |  | 6,999,000
Total recorded investment in impaired loans | 7,007,000 |  | 6,999,000
Unpaid principal balance of impaired loans | 6,993,000 |  | 6,993,000
Specific allowance | 162,000 |  | 188,000
Average recorded investment in impaired loans during the period | 7,003,000 | 6,997,000 |
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 | 1,854,000 |  | 2,171,000
Total recorded investment in impaired loans | 1,854,000 |  | 2,171,000
Unpaid principal balance of impaired loans | 1,847,000 |  | 2,168,000
Specific allowance | 48,000 |  | 159,000
Average recorded investment in impaired loans during the period | 2,012,000 | 2,783,000 |
Interest income recognized on impaired loans during the period ended | 22,000 | 23,000 |
Commercial real estate loans | Construction |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 2,692,000 |  | 2,689,000
With a specific allowance recorded | 284,000 |  | 280,000
Total recorded investment in impaired loans | 2,976,000 |  | 2,969,000
Unpaid principal balance of impaired loans | 2,962,000 |  | 2,963,000
Specific allowance | 11,000 |  | 7,000
Average recorded investment in impaired loans during the period | 2,972,000 | 3,243,000 |
Interest income recognized on impaired loans during the period ended | 38,000 | 34,000 |
Residential loans | Home equity |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 392,000 |  | 406,000
With a specific allowance recorded | 347,000 |  | 347,000
Total recorded investment in impaired loans | 739,000 |  | 753,000
Unpaid principal balance of impaired loans | 736,000 |  | 750,000
Specific allowance | 6,000 |  | 6,000
Average recorded investment in impaired loans during the period | 746,000 | 713,000 |
Interest income recognized on impaired loans during the period ended | 5,000 | 8,000 |
Residential loans | Other residential |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 992,000 |  | 995,000
With a specific allowance recorded | 0 |  | 153,000
Total recorded investment in impaired loans | 992,000 |  | 1,148,000
Unpaid principal balance of impaired loans | 991,000 |  | 1,147,000
Specific allowance | 0 |  | 1,000
Average recorded investment in impaired loans during the period | 1,070,000 | 1,571,000 |
Interest income recognized on impaired loans during the period ended | 13,000 | 19,000 |
Consumer loans | Installment and other consumer |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 46,000 |  | 46,000
With a specific allowance recorded | 666,000 |  | 675,000
Total recorded investment in impaired loans | 712,000 |  | 721,000
Unpaid principal balance of impaired loans | 711,000 |  | 720,000
Specific allowance | 92,000 |  | $ 102,000
Average recorded investment in impaired loans during the period | 717,000 | 939,000 |
Interest income recognized on impaired loans during the period ended | $ 7,000 | $ 10,000 |

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