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Investment Securities (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Investments [Line Items] |  |  |  |  |
Gross investment gains | $ 56,000 | $ 60,000 | $ 115,000 | $ 183,000 |
Gross investment losses |  |  |  | 6,000 |
Investment Securities: |  |  |  |  |
Proceeds from sales of investment securities — available for sale | 937,000 | $ 1,500,000 | 8,143,000 | $ 8,966,000 |
Book value of securities available for sale and held to maturity | $ 114,589,000 |  | $ 114,589,000 |  | $ 104,953,000
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 104 |  | 104 |  |
Standard & Poor's, AAA Rating [Member] |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Portfolio rated | 57.80% |  | 57.80% |  | 63.50%
Standard & Poor's, A Rating [Member] |  |  |  |  |
Investments [Line Items] |  |  |  |  |
Portfolio rated | 12.80% |  | 12.80% |  | 10.10%
Maximum [Member] |  |  |  |  |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 60 months |  |
Maximum [Member] | Standard & Poor's, A Rating [Member] |  |  |  |  |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 44 months 6 days |  |
Minimum [Member] |  |  |  |  |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 24 months |  |
Minimum [Member] | Standard & Poor's, A Rating [Member] |  |  |  |  |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 41 months 6 days |  |

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- Definition Carrying value of available for sale held to maturity and federal home loan bank. + References No definition available. + Details
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