Trouble Debt Restructurings - Narrative (Detail) (USD $)
Sep. 30, 2012
Jun. 30, 2012
Financing Receivable, Modifications [Line Items]    
Impaired receivables $ 803,000  
Impaired receivables, allowance for credit losses 62,000  
Loans modified as a troubled debt restructured loan within the previous 3 months and for which there was a payment default 0 0
Number of days past due for a troubled debt restructured loan to be categorized as default 90 days 90 days
Commitments to lend additional funds to loan customers whose terms had been modified in trouble debt restructures $ 0 $ 0