Investment and Mortgage-Backed Securities, Available for Sale (Schedule of Temporarily Impaired Securities, Fair Value and Unrealized losses) (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Available For Sale, Percent of Unrealized Losses for Securities in a Continuous Loss Position, 12 Months or Longer	47.10%	72.40%
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 60,925,899	$ 110,635,528
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	107,191,190	117,609,243
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	168,117,089	228,244,771
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	526,524	889,535
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	1,204,211	2,328,158
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	1,730,735	3,217,693
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	17,131,812	8,384,145
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,032,349	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	19,164,161	8,384,145
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	168,380	69,249
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	29,778	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	198,158	69,249
SBA Bonds
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	35,333,244	59,496,936
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	35,412,231	25,054,861
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	70,745,475	84,551,797
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	267,120	479,955
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	353,613	410,882
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	620,733	890,837
Tax Exempt Municipal Bonds
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	4,585,849
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,314,589	9,626,613
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,314,589	14,212,462
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	0	91,281
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	41,776	238,488
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	41,776	329,769
Taxable Municipal Bonds [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	992,670	980,520
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	992,670	980,520
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	11,393	23,919
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	11,393	23,919
Mortgage-Backed Securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	8,460,843	38,168,598
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	65,439,351	81,947,249
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	73,900,194	120,115,847
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	91,024	249,050
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	767,651	1,654,869
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	$ 858,675	$ 1,903,919