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Federal Income Taxes - Additional Information (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Deferred tax assets, additional tax basis in RCP Investments | $ 1,000,000 | $ 1,700,000
Deferred tax assets, deferred interest | 0 | 800,000
Deferred tax assets, operating loss carryforwards | $ 1,100,000 | $ 1,300,000

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