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Allowance for Loan Losses By Component (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]    
General component $ 28,163 $ 37,085
Substandard loan component 22,560 29,980
Specific component 29,092 44,150
Total $ 79,815 $ 111,215