Investment and Mortgage-Backed Securities, Available for Sale (Schedule of Temporarily Impaired Securities, Fair Value and Unrealized losses) (Details) - USD ($)	Jun. 30, 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	62.00%	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	$ 61,312,958	$ 110,635,528
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	80,022,995	117,609,243
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	141,335,953	228,244,771
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	445,547	889,535
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	726,420	2,328,158
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	1,171,967	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	32,833,351	8,384,145
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,025,945	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	34,859,296	8,384,145
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	267,097	69,249
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	33,582	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	300,679	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	5,500,585	59,496,936
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	54,691,034	25,054,861
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	60,191,619	84,551,797
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	35,593	479,955
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	491,186	410,882
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	526,779	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	1,145,730	9,626,613
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,145,730	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	1,659	238,488
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	1,659	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
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		980,520
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		980,520
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		23,919
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses		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	22,979,022	38,168,598
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	22,160,286	81,947,249
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	45,139,308	120,115,847
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	142,857	249,050
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	199,993	1,654,869
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	$ 342,850	$ 1,903,919