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Other short-term borrowings (Parenthetical) (Detail)	Dec. 31, 2012	Dec. 31, 2011
Short-term Debt [Line Items]
Federal Home Loan Bank Advances General Debt Obligations Disclosures Interest Rate Range From	0.32%	0.31%
Federal Home Loan Bank Advances General Debt Obligations Disclosures Interest Rate Range To	0.44%	0.31%

States the lowest interest rate applicable to any of the advances from the Federal Home Loan Bank as of the Balance Sheet date.

States the highest interest rate applicable to any of the advances from the Federal Home Loan Bank as of the Balance Sheet date.