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Investment and Mortgage-Backed Securities, Available for Sale (Schedule of Available for Sale Securities) (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale $ 687,898,352   $ 675,913,305
Available-for-sale Securities, Gross Unrealized Gains 3,151,537 $ 12,591,188  
Available-for-sale Securities, Gross Unrealized Losses 22,991,926 5,655,435  
Available-for-sale Securities, Fair Value Disclosure 668,057,963   682,849,058
US States and Political Subdivisions Debt Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 44,717,399   44,757,755
Available-for-sale Securities, Gross Unrealized Gains 1,665,090 5,226,600  
Available-for-sale Securities, Gross Unrealized Losses 641,833 0  
Mortgage-backed Securities, Issued by Private Enterprises [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Fair Value Disclosure     682,849,058
Investments [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Gross Realized Gains   317,722  
Collateralized Loan Obligations [Member]      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 69,643,896   71,949,517
Available-for-sale Securities, Gross Unrealized Losses 772,585 255,678  
Available-for-sale Securities, Gross Realized Gains 148,642    
SBA Bonds      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 129,481,761   139,854,620
Available-for-sale Securities, Gross Unrealized Gains 705,783 1,018,231  
Available-for-sale Securities, Gross Unrealized Losses 2,154,061 1,079,774  
Mortgage-Backed Securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 378,237,842   353,517,112
Available-for-sale Securities, Gross Unrealized Gains 617,656 5,294,398  
Available-for-sale Securities, Gross Unrealized Losses 14,046,302 3,720,596  
Taxable Municipal Bonds [Member]      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 65,817,454   65,834,301
Available-for-sale Securities, Gross Unrealized Gains 14,366 734,237  
Available-for-sale Securities, Gross Unrealized Losses 5,377,145 $ 599,387  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Fair Value Disclosure 45,740,656   49,984,355
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Loan Obligations [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Fair Value Disclosure 69,019,953   72,011,561
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | SBA Bonds      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Fair Value Disclosure 128,033,483   139,793,077
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Fair Value Disclosure 364,809,196   355,090,914
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Taxable Municipal Bonds [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Fair Value Disclosure $ 60,454,675   $ 65,969,151