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Allowance for Loan Losses - Narrative (Details) $ in Thousands | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) loan_class | Dec. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number of classes in the loan portfolio | loan_class | 8 |  |  |  |  |
Allowance for loan and lease losses (as a percentage) | 0.47% | 0.45% |  |  |  |
Allowance for loan and lease losses, period increase (decrease) | $ 226 |  |  |  |  |
Allowance for loan losses | $ 11,471 | $ 11,232 | $ 11,490 | $ 11,472 | $ 10,957 | $ 10,729
Allowance for loan losses as a percent of total loans | 0.92% | 0.91% |  | 0.94% |  |
Number of classes in the commercial loan portfolio | loan_class | 3 |  |  |  |  |
Number of classes in the residential loan portfolio | loan_class | 2 |  |  |  |  |
Residential loans typical loan to value range (as a percentage) | 80.00% |  |  |  |  |
Construction loans accrual to company capital | 25.20% |  |  |  |  |
Constructions loan portfolio maximum to company capital | 100.00% |  |  |  |  |
Construction and non owner occupied commercial real estate | 122.70% |  |  |  |  |
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 | $ 649 | $ 630 | 660 | $ 575 | 581 | 545
Delinquent period before consumer loans charged off (days) | 120 days |  |  |  |  |
Residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan-to-value ratio | 0.80 |  |  |  |  |
Amortization term of residential loans | 30 years |  |  |  |  |
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 |  |  |  |  |
Home equity line of credit |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 633 | 730 | 630 | 678 | 716 | 692
Loan-to-value ratio | 0.80 |  |  |  |  |
Loan maturities | 300 months |  |  |  |  |
Unallocated Reserves |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 1,836 | $ 1,216 |  | 1,425 |  |
Total reserve allowance accounted for by loan loss allowances (percent) | 16.00% | 10.80% |  |  |  |
Construction | Residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 23 | $ 34 | $ 30 | $ 29 | $ 31 | $ 36
Loan maturities | 1 year |  |  |  |  |
Minimum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Residential loans typical loan to value range (as a percentage) | 75.00% |  |  |  |  |
Collateralized consumer loans to individuals loan to value maximum range (as a percentage) | 80.00% |  |  |  |  |
Maximum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Residential loans typical loan to value range (as a percentage) | 80.00% |  |  |  |  |
Collateralized consumer loans to individuals loan to value maximum range (as a percentage) | 90.00% |  |  |  |  |

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