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Allowance for Loan Losses and Credit Quality Indicators (Assessment of Credit Quality) (Details) - USD ($)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 47,000,000 $ 42,300,000 $ 37,500,000
Loans and Leases Receivable, Deferred Income 290,813,752 258,991,492  
Loans and Leases Receivable, Gross 1,127,957,383 1,004,233,159  
New borrower [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 138,140,479    
Former borrower [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 116,242,182    
Refinance [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 854,880,194    
Delinquent refinance [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 18,694,528    
Consumer loans- non-bankrupt accounts [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 1,121,895,834 998,299,051  
Consumer loans- bankrupt accounts [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 6,061,549 5,934,108  
Loans Individually Evaluated For Impairment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 64,277,744 54,647,166  
Loans Collectively Evaluated For Impairment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 1,063,679,639 949,585,993  
Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 1,039,774,448 929,400,862  
Nonperforming Financial Instruments [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest $ 88,182,935 74,832,297  
Delinquent refinance [Member] | Delinquent refinance [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross   17,073,883  
New borrower [Member] | New borrower [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross   104,762,628  
Former borrower [Member] | Former borrower [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross   104,281,551  
Refinance [Member] | Refinance [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross   $ 778,115,097