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Income Tax Expense (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) Partnership | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Partnership
Income Tax Expense [Abstract] |  |  |  |  |
Investments in number of partnerships | Partnership |  |  | 4 |  | 4
Investment amount in partnerships | $ 765,000 |  | $ 765,000 |  | $ 959,000
Investment Tax Credit Carryforward [Member] |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Investment tax credits | 895,000 |  | $ 895,000 |  |
Tax credits recognition period |  |  | 6 years 3 months |  |
Tax credits recognized as reduction of tax expense amount | $ 50,000 | $ 50,000 | $ 149,000 | $ 149,000 |

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