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Allowance for Loan Losses - Narrative (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) loan_class | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of related loans | 0.45% |  |  |
Increase (decrease) in qualitative portion | $ 381 |  |  |
Allowance for loan losses | $ 11,232 | $ 10,729 | $ 10,138 | $ 9,916
Allowance for loan losses as a percent of total loans | 0.91% | 0.92% |  |
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 | 25.70% |  |  |
Construction loans, maximum percent of capital | 100.00% |  |  |
Construction loans and non-owner-occupied commercial real estate loans, percent of capital | 126.40% |  |  |
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 | 60.00% |  |  |
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 | $ 255 | $ 434 | 396 | 580
Loan maturities | 2 years |  |  |
Home Equity LIne of Credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 730 | 692 | 807 | 893
Loan maturities | 300 months |  |  |
Loan to value ratio | 0.80 |  |  |
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 | $ 34 | 36 | 44 | 24
Loan maturities | 1 year |  |  |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 630 | 545 | $ 559 | $ 566
Delinquent period before consumer loans are charged off | 120 days |  |  |
Unallocated Reserves |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 1,216 | $ 642 |  |
Percent of total allowance reserve | 10.80% | 6.00% |  |
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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