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Organization and Summary of Significant Accounting Policies - New Accounting Pronouncement Effect (Details) - USD ($)	12 Months Ended
	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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