Securities Available for Sale - Summary of Temporarily Impaired Securities (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)
Less Than 12 Months, Fair Value	$ 57,694,364
Less Than 12 Months, Unrealized Loss	(11,167,307)
12 Months or Longer, Fair Value	43,720
12 Months or Longer, Unrealized Loss	(6,549)
Preferred Stock [Member]
Less Than 12 Months, Fair Value	1,383,064
Less Than 12 Months, Unrealized Loss	(104,080)
12 Months or Longer, Fair Value	43,720
12 Months or Longer, Unrealized Loss	(6,549)
Common Stock [Member]
Less Than 12 Months, Fair Value	56,311,300
Less Than 12 Months, Unrealized Loss	(11,063,227)
12 Months or Longer, Fair Value	0
12 Months or Longer, Unrealized Loss	$ 0