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Income Taxes - Summary of Consolidated Federal Income Tax Return (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary of consolidated Federal income tax return |  |  |
Current city income tax provision | $ 1,245,285 | $ 935,612 | $ 952,957
Current state income tax provision | 335,897 | 429,147 | 268,920
Current federal income tax provision | 22,874,571 | 15,015,813 | 17,866,911
Deferred federal income tax benefit | (3,547,088) | 2,404,433 | (5,611,451)
Provision for income taxes | $ 20,908,665 | $ 18,785,005 | $ 13,477,337

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