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Business Combinations - Additional Information (Detail) (USD $)
6 Months Ended
Jun. 30, 2013
Dec. 01, 2012
PCBC
Jun. 30, 2013
PB Capital
Jun. 30, 2013
Corporate Banking [Member]
Business Combinations [Abstract]        
Goodwill, adjustments $ 17,000,000      
Business Acquisition [Line Items]        
Cash paid   1,500,000,000 3,700,000,000  
Loans outstanding 3,500,000,000      
Fair value of assets acquired 3,400,000,000      
Goodwill       $ 227,000,000
Term for change in provisional fair value estimates after closing date of acquisition 1 year