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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, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]        
Available-for-sale Securities, Gross Realized Losses   $ 0 $ 283,000  
Available For Sale Securities Pledged as Collateral, Amortized Cost Basis   221,600,000   $ 171,400,000
Pledged Assets Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment   231,600,000   173,100,000
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale   456,753,017   408,695,280
Available-for-sale Securities, Gross Unrealized Gains $ 8,410,493 18,053,021    
Available-for-sale Securities, Gross Unrealized Losses 2,460,933 2,874,415    
Available-for-sale Securities, Fair Value Disclosure   471,931,623   414,644,840
Proceeds From Sale of Available For Sale Securities Including Mortgage Backed Securities   20,400,000 61,900,000  
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   38,913,210   43,153,086
Available-for-sale Securities, Gross Unrealized Gains 4,088,408 5,180,069    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Mortgage-backed Securities, Issued by Private Enterprises [Member]        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale   32,000,000.0   15,800,000
Available-for-sale Securities, Fair Value Disclosure   32,600,000    
Investments [Member]        
Debt Securities, Available-for-sale [Line Items]        
Available-for-sale Securities, Gross Realized Gains 0 1,200,000 $ 1,200,000  
Collateralized Loan Obligations [Member]        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale   52,946,093   41,088,231
Available-for-sale Securities, Gross Unrealized Losses 856,401 1,785,755    
Available-for-sale Securities, Gross Realized Gains   24,329    
SBA Bonds        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale   110,532,402   111,927,938
Available-for-sale Securities, Gross Unrealized Gains 622,105 647,863    
Available-for-sale Securities, Gross Unrealized Losses 656,944 693,082    
Mortgage-Backed Securities        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale   226,394,056   197,356,288
Available-for-sale Securities, Gross Unrealized Gains 3,664,621 11,425,761    
Available-for-sale Securities, Gross Unrealized Losses 582,902 305,132    
Taxable Municipal Bonds [Member]        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale   27,901,187   15,169,737
Available-for-sale Securities, Gross Unrealized Gains 35,359 774,999    
Available-for-sale Securities, Gross Unrealized Losses $ 364,686 90,446    
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   44,093,279   47,241,494
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   51,184,667   40,231,830
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   110,487,183   111,893,099
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   237,514,685   200,438,007
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   $ 28,585,740   $ 14,840,410