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Mortgage Banking Activities - Activity in Valuation Allowance for Mortgage Servicing Rights (Detail) (USD $)
3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Mortgage Loan Activity [Line Items]        
Balance, beginning of period $ (1,420,660) $ (1,002,469) $ (816,481) $ (304,001)
Impairment charges (161,679) 0 (765,858) (698,468)
Impairment recoveries   15,392   15,392
Balance, end of period $ (1,582,339) $ (987,077) $ (1,582,339) $ (987,077)