Investment and Mortgage-Backed Securities, Available for Sale (Schedule of Temporarily Impaired Securities, Fair Value and Unrealized losses) (Details) - USD ($)	Sep. 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	55.10%	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	$ 97,096,679	$ 110,635,528
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	73,369,182	117,609,243
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	170,465,861	228,244,771
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	679,235	889,535
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	834,474	2,328,158
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	1,513,709	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	31,327,315	8,384,145
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,030,566	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	34,357,881	8,384,145
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	283,132	69,249
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	46,840	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	329,972	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	20,192,185	59,496,936
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	49,743,150	25,054,861
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	69,935,335	84,551,797
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	101,704	479,955
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	550,284	410,882
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	651,988	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	0	9,626,613
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0	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	0	238,488
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	0	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	44,595,549	38,168,598
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	20,595,466	81,947,249
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	65,191,015	120,115,847
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	256,776	249,050
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	237,350	1,654,869
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	$ 494,126	$ 1,903,919