Summary of Significant Accounting Policies (Summary of Components of Other Comprehensive Earnings) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Summary of Significant Accounting Policies [Abstract]
Unrealized holding (losses) gains arising during the period, Pre-tax	$ (2,147,336)	$ 527,327
Reclassification adjustment for (gains) losses included in net earnings, Pre-tax	(1,102,130)	(444,781)
Total other comprehensive (loss) earnings, Pre-tax	(3,249,466)	82,546
Unrealized holding (losses) gains arising during the period, Tax	450,942	(179,291)
Reclassification adjustment for (gains) losses included in net earnings, Tax	231,447	151,226
Total other comprehensive (loss) earnings, Tax	682,389	(28,065)
Unrealized holding (losses) gains arising during the period, After-tax	(1,696,394)	348,036
Reclassification adjustment for (gains) losses included in net earnings, After-tax	(870,683)	(293,555)
Total other comprehensive earnings	$ (2,567,077)	$ 54,481