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Other short-term borrowings (Parenthetical) (Detail)
Jun. 30, 2012
Short-term Debt [Line Items]  
Federal Home Loan Bank Advances General Debt Obligations Disclosures Interest Rate Range From 0.36%
Federal Home Loan Bank Advances General Debt Obligations Disclosures Interest Rate Range To 0.38%
Term Funds Interest Rate Range From 0.00%
Term Funds Interest Rate Range To 0.00%