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Summary of Significant Accounting Policies - Additional Information (Detail) - Jun. 30, 2015 - USD ($)
Total
Accounting Policies [Abstract]  
Minimum past due of loans for nonaccrual status 90 days
Loans with identified weakness and principal balance $ 100,000
Loans with identified weakness and principal balance 500,000
Assignment of valuation allowance for specified amount of loan $ 500,000