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COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Commitments and Contingencies Disclosure [Line Items]    
Letters of credit issued to guarantee performance of a client to a third party $ 15,600,000 $ 17,600,000
Commitments to Extend Credit
   
Commitments and Contingencies Disclosure [Line Items]    
Commitments outstanding to extend credit $ 1,100,000,000 $ 1,000,000,000