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Investment and Mortgage-Backed Securities, Available for Sale (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available for Sale Securities
The amortized cost, gross unrealized gains, gross unrealized losses, and fair values of investment and mortgage-backed securities available for sale at the dates indicated were as follows:
 June 30, 2020
 Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Student Loan Pools$52,946,093  $24,329  $1,785,755  $51,184,667  
Small Business Administration (“SBA”) Bonds110,532,402  647,863  693,082  110,487,183  
Tax Exempt Municipal Bonds38,913,210  5,180,069  —  44,093,279  
Taxable Municipal Bonds27,901,187  774,999  90,446  28,585,740  
Mortgage-Backed Securities226,394,056  11,425,761  305,132  237,514,685  
State Tax Credit66,069  —  —  66,069  
Total Available For Sale$456,753,017  $18,053,021  $2,874,415  $471,931,623  
 December 31, 2019
 Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Student Loan Pools
$41,088,231  $—  $856,401  $40,231,830  
SBA Bonds
111,927,938  622,105  656,944  111,893,099  
Tax Exempt Municipal Bonds
43,153,086  4,088,408  —  47,241,494  
Taxable Municipal Bonds
15,169,737  35,359  364,686  14,840,410  
Mortgage-Backed Securities
197,356,288  3,664,621  582,902  200,438,007  
Total Available For Sale$408,695,280  $8,410,493  $2,460,933  $414,644,840  
Schedule of Available For Sale Securities, Contractual Maturities
June 30, 2020
Investment Securities:Amortized CostFair Value
One Year or Less$78,977  $78,893  
After One – Five Years5,183,070  5,225,881  
After Five – Ten Years67,925,056  67,955,648  
More Than Ten Years157,171,858  161,156,516  
Mortgage-Backed Securities226,394,056  237,514,685  
Total Available For Sale$456,753,017  $471,931,623  
Schedule of Temporarily Impaired Securities, Fair Value and Unrealized Losses
The following tables show gross unrealized losses and fair value, aggregated by investment category, and length of time that the individual available for sale securities were in a continuous unrealized loss position at the dates indicated.
 June 30, 2020
 Less than 12 Months12 Months or MoreTotal
 Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Student Loan Pools$19,529,136  $538,513  $29,869,847  $1,247,242  $49,398,983  $1,785,755  
SBA Bonds30,451,987  179,367  43,790,190  513,715  74,242,177  693,082  
Taxable Municipal Bonds3,508,658  90,446  —  —  3,508,658  90,446  
Mortgage-Backed Securities24,160,716  205,894  29,139,252  99,238  53,299,968  305,132  
 $77,650,497  $1,014,220  $102,799,289  $1,860,195  $180,449,786  $2,874,415  
6. Investment and Mortgage-Backed Securities, Available For Sale, Continued
 December 31, 2019
 Less than 12 Months12 Months or MoreTotal
 Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Student Loan Pools$30,079,497  $534,048  $10,152,333  $322,353  $40,231,830  $856,401  
SBA Bonds13,844,666  106,110  47,395,036  550,834  61,239,702  656,944  
Taxable Municipal Bond13,810,279  364,686  —  —  13,810,279  364,686  
Mortgage-Backed Securities55,326,064  480,958  7,975,863  101,944  63,301,927  582,902  
 $113,060,506  $1,485,802  $65,523,232  $975,131  $178,583,738  $2,460,933