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Allowance for Loan Losses and Credit Quality Indicators (Assessment of Credit Quality) (Details) - USD ($)
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Financing Receivable, Recorded Investment [Line Items]      
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 49,100,000 $ 42,200,000 $ 41,200,000
Loans and Leases Receivable, Deferred Income 299,108,336 291,908,651  
Loans and Leases Receivable, Gross 1,105,114,792 1,059,804,132  
New borrower [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 160,791,141    
Former borrower [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 115,141,944    
Refinance [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 811,726,005    
Delinquent refinance [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 17,455,702    
Consumer loans- non-bankrupt accounts [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 1,099,180,684 1,053,769,654  
Consumer loans- bankrupt accounts [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 5,934,108 6,034,478  
Loans Individually Evaluated For Impairment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 70,751,967 59,214,519  
Loans Collectively Evaluated For Impairment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 1,034,362,825 1,000,589,613  
Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross 1,007,372,253 977,171,570  
Nonperforming Financial Instruments [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest $ 97,742,539 82,632,562  
Delinquent refinance [Member] | Delinquent refinance [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross   17,673,274  
New borrower [Member] | New borrower [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross   168,656,845  
Former borrower [Member] | Former borrower [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross   108,100,688  
Refinance [Member] | Refinance [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross   $ 765,373,325