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Investment Securities (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Investments [Line Items] |  |  |
Gross investment gains | $ 63,000 |  |
Gross investment losses | 6,000 |  |
Investment Securities: |  |  |
Consolidated investment securities portfolio modified, years |  |  | 34 months 6 days
Proceeds from sales of investment securities — available for sale | 4,248,000 | $ 0 |
Book value of securities available for sale and held to maturity | $ 99,376,000 |  | $ 87,096,000
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 24 |  |
Standard & Poor's, AAA Rating [Member] |  |  |
Investments [Line Items] |  |  |
Portfolio rated | 78.00% |  | 79.10%
Standard & Poor's, A Rating [Member] |  |  |
Investments [Line Items] |  |  |
Portfolio rated | 5.80% |  | 5.70%
Investment Securities: |  |  |
Consolidated investment securities portfolio modified, years | 29 months 24 days |  |
Maximum [Member] |  |  |
Investment Securities: |  |  |
Consolidated investment securities portfolio modified, years | 42 months |  |
Minimum [Member] |  |  |
Investment Securities: |  |  |
Consolidated investment securities portfolio modified, years | 24 months |  |

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