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Investment Securities (Details Textual) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) Position | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Position | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Investments [Line Items] |  |  |  |  |
Gross investment losses |  |  |  | $ 163,000 |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 37 months 6 days |  | 44 months 3 days
Proceeds from sales of investment securities — available for sale | $ 530,000 | $ 0 | $ 530,000 | 4,479,000 |
Available for sale Securities And Held To Maturity Securities In Unrealized Loss Positions | Position | 65 |  | 65 |  |
Gross investment gains | $ 30,000 |  | $ 30,000 | $ 15,000 |
Available-for-sale Securities and Held-to-maturity Securities | 121,682,000 |  | 121,682,000 |  | $ 115,536,000
Deferred Compensation, Share-based Payments [Member] | Assets Held With Rabbi Trust [Member] |  |  |  |  |
Investment Securities: |  |  |  |  |
Equity Securities, FV-NI | $ 328,000 |  | $ 328,000 |  |
Standard & Poor's, AAA Rating [Member] |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Portfolio rated | 57.50% |  | 57.50% |  | 57.50%
Securities Rated Below A [Member] |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Portfolio rated | 8.70% |  | 8.70% |  | 10.00%
Maximum [Member] |  |  |  |  |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 60 months |  |
Minimum [Member] |  |  |  |  |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 24 months |  |

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