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Fair Value of Financial Instruments - Schedule of Unrealized Losses and Fair Value of Investment Securities (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value Disclosures [Abstract] |  |
Less than 12 months, unrealized holding (gains) losses, fair value | $ 14,395,809 | $ 7,515,676
Less than 12 months, unrealized holding gains (losses), fair value | 1,306,579 | 6,742,322
Investment securities - available for sale, at fair value | 15,702,388 | 14,257,998
Less than 12 months, unrealized holding (gains) losses | 95,013 | 38,068
Less than 12 months, unrealized holding gains (losses) | (437) | (8,196)
Unrealized holding gains (losses) | $ 94,576 | $ 29,872

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