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Income Taxes - Summary of Consolidated Federal Income Tax Return (Details) - USD ($)
 12 Months Ended
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