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Investment Securities (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Investments [Line Items] |  |  |
Gross investment gains | $ 27,000 | $ 63,000 |
Gross investment losses | 6,000 |  |
Investment Securities: |  |  |
Proceeds from sales of investment securities — available for sale | 5,653,000 | $ 4,248,000 |
Book value of securities available for sale and held to maturity | $ 111,529,000 |  | $ 104,953,000
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 111 |  |
Standard & Poor's, AAA Rating [Member] |  |  |
Investments [Line Items] |  |  |
Portfolio rated | 61.30% |  | 79.10%
Standard & Poor's, A Rating [Member] |  |  |
Investments [Line Items] |  |  |
Portfolio rated | 10.70% |  | 5.70%
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 | 45 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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