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Troubled Debt Restructurings (Details Textual) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) Loans | Sep. 30, 2017 USD ($) Loans | Sep. 30, 2018 USD ($) Loans | Sep. 30, 2017 USD ($) Loans | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Total troubled debt restructurings | $ 5,600,000 |  | $ 5,600,000 |  |  | $ 5,000,000
Specific reserves to customers | 318,000 |  | 318,000 |  |  | 162,000
Commitments to lend additional amounts to borrowers classified as troubled debt restructurings | 0 |  | 0 |  |  | 0
Provision for loan losses | $ 950,000 | $ 950,000 | $ 2,475,000 | $ 2,950,000 |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loan | Loans |  | 0 |  | 0 |  |
Scenario, Forecast |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Provision for loan losses |  |  |  |  | $ 0 |
Commercial loans |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loan | Loans | 1 |  | 1 |  |  |
Loans default payment past due period |  |  | 30 days |  |  |
Residential real estate loan |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructured loans with subsequent payment defaults | Loans | Loan | Loans | 3 |  | 3 |  |  |
Residential Real Estate Loan And Home Equity Line Of Credit |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Loans default payment past due period |  |  | 30 days |  |  |
Troubled debt restructurings |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Specific reserves to customers | $ 87,000 |  | $ 87,000 |  |  | $ 68,000
Allowance adjustment charge offs | 27,000 | $ 30,000 | 66,000 | $ 60,000 |  |
Provision for loan losses | $ 27,000 | $ 30,000 | $ 66,000 | $ 60,000 |  |
Extended Maturity |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Maturity period loans | 84 months | 120 months |  |  |  |
Extended Maturity | Minimum |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Maturity period loans |  |  | 5 months | 6 months |  |
Extended Maturity | Maximum |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Maturity period loans |  |  | 84 months | 132 months |  |
Contractual Interest Rate Reduction |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Reduction of the notes stated interest rate |  | 0.99% |  |  |  |
Contractual Interest Rate Reduction | Minimum |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Reduction of the notes stated interest rate |  |  | 1.75% | 0.49% |  |
Contractual Interest Rate Reduction | Maximum |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Reduction of the notes stated interest rate |  |  | 2.50% | 1.89% |  |

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