Investment and Mortgage-Backed Securities, Available for Sale (Schedule of Temporarily Impaired Securities, Fair Value and Unrealized losses) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
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	22.70%	37.00%
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 181,459,214	$ 106,073,904
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	59,736,921	82,910,611
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	241,196,135	188,984,515
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	3,016,561	1,430,106
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	885,403	839,780
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	3,901,964	2,269,886
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	19,683,284	7,196,541
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	8,974,486	29,460,703
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	28,657,770	36,657,244
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	101,836	46,207
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	41,732	336,779
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	143,568	382,986
SBA Bonds
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	28,694,170	39,843,800
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	38,137,753	43,907,816
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	66,831,923	83,751,616
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	637,312	653,518
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	315,088	403,936
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	952,400	1,057,454
Tax Exempt Municipal Bonds
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,740,849
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,740,849
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	36,273
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	36,273
Taxable Municipal Bonds [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	15,994,162	7,092,538
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,344,600	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	19,338,762	7,092,538
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	285,575	75,168
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	164,529	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	450,104	75,168
Mortgage-Backed Securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	112,346,749	51,941,025
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	9,280,082	9,542,092
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	121,626,831	61,483,117
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	1,955,565	655,213
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	364,054	99,065
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	$ 2,319,619	$ 754,278