Allowance for Loan Losses and Credit Quality Indicators (Assessment of Credit Quality) (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Gross loan balance	$ 1,067,051,763	$ 972,722,764	$ 875,045,680
New borrower [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loan balance	130,897,466	110,362,853
Former borrower [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loan balance	90,281,773	79,712,646
Refinance [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loan balance	826,073,460	761,633,523
Delinquent refinance [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loan balance	19,799,064	21,013,742
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loan balance	1,020,337,490	934,095,598
Contractual non-performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loan balance	46,714,273	38,627,166
Consumer loans- non-bankrupt accounts [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loan balance	1,061,141,557	967,075,808
Consumer loans- bankrupt accounts [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loan balance	$ 5,910,206	$ 5,646,956