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Allowance for Loan Losses - Narrative (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) loan_class | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of loan classes | loan_class | 8 |  |  |
Percent of related loans | 0.45% | 0.39% |  |
Increase (decrease) in qualitative portion | $ 1,027 |  |  |
Allowance for loan losses | $ 10,729 | $ 10,138 | $ 9,916 | $ 10,344
Allowance for loan losses as a percent of total loans | 0.92% | 0.95% |  |
Number of commercial loan classes | loan_class | 3 |  |  |
Loan-to-value percent, commercial real estate | 80.00% |  |  |
Number of residential loan classes | loan_class | 2 |  |  |
Construction loans, percent of capital | 34.40% |  |  |
Construction loans, maximum percent of capital | 100.00% |  |  |
Construction loans and non-owner-occupied commercial real estate loans, percent of capital | 129.20% |  |  |
Construction loans and non-owner-occupied commercial real estate loans, maximum percent of capital | 300.00% |  |  |
Outstanding loans and commitments subject by independent consulting firm | 50.00% |  |  |
Residential loans, loan to value percent minimum | 75.00% |  |  |
Residential loans, loan to value percent, maximum | 80.00% |  |  |
Consumer loans, loan to value percent, minimum | 80.00% |  |  |
Consumer loans, loan to value percent, maximum | 90.00% |  |  |
Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 434 | $ 396 | 580 | 823
Loan maturities | 2 years |  |  |
Home Equity LIne of Credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 692 | 807 | 893 | 1,060
Loan maturities | 300 months |  |  |
Loan to value ratio | 0.8 |  |  |
Residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan to value ratio | 0.80 |  |  |
Amortization term (in years) | 30 years |  |  |
Delinquent period before residential loans are placed on non-accrual status | 90 days |  |  |
Delinquent period for loans charged off | 180 days |  |  |
Delinquent period for loans charged off after receipt of notification | 60 days |  |  |
Residential | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 36 | 44 | 24 | 20
Loan maturities | 1 year |  |  |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 545 | 559 | $ 566 | $ 542
Delinquent period before consumer loans are charged off | 120 days |  |  |
Unallocated Reserves |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 642 | $ 1,258 |  |
Percent of total allowance reserve | 6.00% | 12.40% |  |
Unallocated Reserves | Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 0 | $ 0 |  |
Unallocated Reserves | Home Equity LIne of Credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Unallocated Reserves | Residential | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 |  |
Unallocated Reserves | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 0 | $ 0 |  |

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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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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