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Investment Securities - Rollforward of Cumulative Other Than Temporary Credit Losses Recognized in Earnings for Debt Securities (Details 1) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]      
Estimated credit losses, beginning of year $ 3,262,496 $ 3,262,496 $ 3,262,496
Sales of securities with previous OTTI recognized $ (3,262,496)    
Credit losses - no previous OTTI recognized
Credit losses - previous OTTI recognized     $ 15,581
Estimated credit losses, end of year   $ 3,262,496 $ 3,262,496