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Quarterly Results of Operations (Unaudited) - Summary (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 21,933,607 us-gaap_Revenues | $ 21,800,765 us-gaap_Revenues | $ 21,723,072 us-gaap_Revenues | $ 21,332,514 us-gaap_Revenues | $ 20,443,054 us-gaap_Revenues | $ 20,761,230 us-gaap_Revenues | $ 20,948,924 us-gaap_Revenues | $ 20,475,735 us-gaap_Revenues |  |  |
Interest expense | 1,578,737 us-gaap_InterestExpense | 1,457,919 us-gaap_InterestExpense | 1,485,193 us-gaap_InterestExpense | 1,448,585 us-gaap_InterestExpense | 1,389,209 us-gaap_InterestExpense | 1,441,175 us-gaap_InterestExpense | 1,442,898 us-gaap_InterestExpense | 1,404,906 us-gaap_InterestExpense | 5,970,434 us-gaap_InterestExpense | 5,678,188 us-gaap_InterestExpense | 5,120,827 us-gaap_InterestExpense
Provision for credit losses | 5,187,832 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 5,796,648 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 5,154,235 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 4,231,815 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 4,181,286 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 4,183,035 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 3,973,104 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 2,641,791 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 20,370,530 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 14,979,216 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 13,391,875 us-gaap_ProvisionForLoanLeaseAndOtherLosses
Non-interest expense | 8,935,129 us-gaap_NoninterestExpense | 8,407,719 us-gaap_NoninterestExpense | 8,088,886 us-gaap_NoninterestExpense | 8,920,889 us-gaap_NoninterestExpense | 9,484,125 us-gaap_NoninterestExpense | 8,477,233 us-gaap_NoninterestExpense | 8,329,886 us-gaap_NoninterestExpense | 7,163,565 us-gaap_NoninterestExpense |  |  |
Operating income before income taxes | 6,231,909 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 6,138,479 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 6,994,758 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 6,731,225 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 5,388,434 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 6,659,787 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 7,203,036 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 9,265,473 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 26,096,371 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 28,516,730 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 32,486,155 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense | 2,384,462 us-gaap_IncomeTaxExpenseBenefit | 2,368,923 us-gaap_IncomeTaxExpenseBenefit | 2,665,057 us-gaap_IncomeTaxExpenseBenefit | 1,822,037 us-gaap_IncomeTaxExpenseBenefit | 2,528,895 us-gaap_IncomeTaxExpenseBenefit | 2,833,019 us-gaap_IncomeTaxExpenseBenefit | 2,886,484 us-gaap_IncomeTaxExpenseBenefit | 3,564,980 us-gaap_IncomeTaxExpenseBenefit | 9,240,479 us-gaap_IncomeTaxExpenseBenefit | 11,813,378 us-gaap_IncomeTaxExpenseBenefit | 12,545,209 us-gaap_IncomeTaxExpenseBenefit
Net income | $ 3,847,447 us-gaap_NetIncomeLoss | $ 3,769,556 us-gaap_NetIncomeLoss | $ 4,329,701 us-gaap_NetIncomeLoss | $ 4,909,188 us-gaap_NetIncomeLoss | $ 2,859,539 us-gaap_NetIncomeLoss | $ 3,826,768 us-gaap_NetIncomeLoss | $ 4,316,552 us-gaap_NetIncomeLoss | $ 5,700,493 us-gaap_NetIncomeLoss | $ 16,855,892 us-gaap_NetIncomeLoss | $ 16,703,352 us-gaap_NetIncomeLoss | $ 19,940,946 us-gaap_NetIncomeLoss
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.34 us-gaap_EarningsPerShareBasic | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.40 us-gaap_EarningsPerShareBasic | $ 0.24 us-gaap_EarningsPerShareBasic | $ 0.32 us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.47 us-gaap_EarningsPerShareBasic | $ 1.40 us-gaap_EarningsPerShareBasic | $ 1.38 us-gaap_EarningsPerShareBasic | $ 1.66 us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ 0.33 us-gaap_EarningsPerShareDiluted | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 0.35 us-gaap_EarningsPerShareDiluted | $ 0.40 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.31 us-gaap_EarningsPerShareDiluted | $ 0.35 us-gaap_EarningsPerShareDiluted | $ 0.46 us-gaap_EarningsPerShareDiluted | $ 1.38 us-gaap_EarningsPerShareDiluted | $ 1.36 us-gaap_EarningsPerShareDiluted | $ 1.63 us-gaap_EarningsPerShareDiluted
Dividends per share (in dollars per share) |  |  |  |  |  |  | $ 0.12 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.12 us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.24 us-gaap_CommonStockDividendsPerShareDeclared | $ 2.46 us-gaap_CommonStockDividendsPerShareDeclared

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