Allowance for Loan Losses and Credit Quality Indicators (Summary of Past Due Receivables) (Details) (Contractual basis [Member], USD $)	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Contractual basis [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-60 days past due	$ 37,674,267	$ 24,853,508	$ 23,705,287
61-90 days past due	22,773,063	17,320,264	16,564,121
91 days or more past due	23,941,210	21,306,902	16,625,070
Total	$ 84,388,540	$ 63,480,674	$ 56,894,478
Percentage of period end gross loans receivable	7.90%	6.50%	6.50%