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Gains and losses (realized and unrealized) included in earnings for level 3 assets and liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]    
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income $ 1,168 $ (6,775)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings (7,193) (12,576)
Fair Value Assets And Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss Total (2,022) (5,415)
Interest Income Member
   
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]    
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Other Income (2) (1)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0
Other Fee Revenue [Member]
   
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]    
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Other Income (8,096) (5,615)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income (3,023) 1,443
Trading Gains Losses [Member]
   
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]    
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Trading Revenue (263) (185)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Trading Revenue (167) (83)
F D I C Loss Share Expense Income [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]    
Fair Value, Liabilities Measured on Recurring Basis, Gain (Loss) Included in Other Income 1,168 (6,775)
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income $ 1,168 $ (6,775)