Securities Available for Sale - Summary of Temporarily Impaired Securities (Details)	9 Months Ended
	Sep. 30, 2017 USD ($)
Less Than 12 Months, Fair Value	$ 67,980,730
Less Than 12 Months, Unrealized Loss	(5,251,951)
12 Months or Longer, Fair Value	0
12 Months or Longer, Unrealized Loss	0
Preferred Stock [Member]
Less Than 12 Months, Fair Value	542,280
Less Than 12 Months, Unrealized Loss	(2,396)
12 Months or Longer, Fair Value	0
12 Months or Longer, Unrealized Loss	0
Common Stock [Member]
Less Than 12 Months, Fair Value	67,438,450
Less Than 12 Months, Unrealized Loss	(5,249,555)
12 Months or Longer, Fair Value	0
12 Months or Longer, Unrealized Loss	$ 0