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Allowance for Loan Losses - Narrative (Details) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) loan_class | Dec. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number of classes in the loan portfolio (loan class) | loan_class | 8 |  |  |  |  |
Allowance for loan and lease losses (percent) | 0.43% | 0.45% |  |  |  |
Allowance for loan and lease losses, period increase (decrease) | $ 162 |  |  |  |  |
Allowance for loan losses | $ 11,682 | $ 10,729 | $ 11,472 | $ 11,012 | $ 10,611 | $ 10,138
Allowance for loan losses as a percent of total loans | 0.94% | 0.92% |  | 0.98% |  |
Number of classes in the commercial loan portfolio (loan class) | loan_class | 3 |  |  |  |  |
Residential loans typical loan to value range, maximum (percent) | 80.00% |  |  |  |  |
Construction loans accrual to company capital | 24.40% |  |  |  |  |
Constructions loan portfolio maximum to company capital | 100.00% |  |  |  |  |
Construction and non owner occupied commercial real estate | 123.10% |  |  |  |  |
Maximum loan portfolio to company capital | 300.00% |  |  |  |  |
Outstanding loans and commitments subject by independent consulting firm | 60.00% |  |  |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 740 | $ 545 | $ 575 | $ 535 | $ 529 | $ 559
Delinquent period before consumer loans charged off (days) | 120 days |  |  |  |  |
Residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Delinquent period before residential loans placed on non accrual status (days) | 90 days |  |  |  |  |
Delinquent period for loans charged off (days) | 180 days |  |  |  |  |
Delinquency period for loans charged off after receipt of notification from bankruptcy court (days) | 60 days |  |  |  |  |
Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 1,678 | $ 642 |  | $ 852 |  |
Total reserve allowance accounted for by loan loss allowances (percent) | 14.40% | 6.00% |  |  |  |

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- Definition The regulatory maximum allowed ratio of loan portfolio to Company capital for construction and non-owner-occupied commercial real estate. + References No definition available. + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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