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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
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 $ (476) $ (179) $ (7,251) $ (1,251)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings (5,791) (5,708) (18,366) (4,962)
Fair Value Assets And Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss Total 2,128 (308) (3,287) 4,420
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) (3) (3)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 0 0 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 (5,126) (5,575) (10,741) (4,791)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income 2,569 (236) 4,013 5,519
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 (187) 47 (371) 1,083
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Trading Revenue 35 107 (49) 152
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 (476) (236) (7,251) (1,857)
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income (476) (236) (7,251) (1,857)
Other 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 0 57 0 606
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income $ 0 $ 57 $ 0 $ 606