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Other short-Term Borrowings (Parenthetical) (Detail)
Dec. 31, 2011
Dec. 31, 2010
Short-term Debt [Line Items]    
Advances with the FHLB, interest rate 0.31%  
Advances with the FHLB, interest rate range from   0.36%
Advances with the FHLB, interest rate range to   0.44%
Term Funds Interest Rate Range From   1.15%
Term Funds Interest Rate Range To   1.25%