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Other Real Estate Owned - Additional Information (Detail) (USD $)
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Real Estate [Line Items]        
OREO valuation allowance, net $ 36,009,000 $ 22,521,000 $ 19,975,000 $ 16,630,000
Minimum
       
Real Estate [Line Items]        
Development and improvement cost of the property $ 10,000