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Organization and Summary of Significant Accounting Policies - New Accounting Pronouncement Effect (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities |  |
Amortization of premium on held-to-maturity securities, net | $ 676,644 | $ 1,107,377
Net cash used in operating activities | (4,407,189) | (1,691,174)
Cash flows from investing activities |  |
Purchases of held-to-maturity investment securities | (49,734,681) | (51,463,084)
Net cash provided by (used in) investing activities | $ 3,328,319 | (812,084)
As filed |  |
Cash flows from operating activities |  |
Amortization of premium on held-to-maturity securities, net |  | 192,293
Net cash used in operating activities |  | (2,606,258)
Cash flows from investing activities |  |
Purchases of held-to-maturity investment securities |  | (50,548,000)
Net cash provided by (used in) investing activities |  | 103,000
Accounting Standards Update 2016-15 | Adjustments |  |
Cash flows from operating activities |  |
Amortization of premium on held-to-maturity securities, net |  | 915,084
Net cash used in operating activities |  | 915,084
Cash flows from investing activities |  |
Purchases of held-to-maturity investment securities |  | (915,084)
Net cash provided by (used in) investing activities |  | $ (915,084)

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