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Gains and losses (realized and unrealized) included in earnings for level 3 assets and liabilities (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings $ (4,376) $ (2,537) $ (11,156) $ (19,147)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (1,058) 1,078 6,777 1,040
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss (54) 2,633 1,996 (3,813)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss (1,058) 1,078 6,777 1,040
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings (5,434) (1,459) (4,379) (18,107)
Fair Value Assets And Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss Total (1,112) 3,711 8,773 (2,773)
Interest Income Member        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (1) (1) (1) (4)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 0 0 0 0
Mortgage Banking Activities [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (4,408) (2,588) (11,254) (18,424)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss (112) 2,528 1,774 (3,314)
Trading Gains Losses [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 33 52 99 (719)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 58 105 222 (499)
F D I C Loss Share Expense Income [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (1,058) 1,078 6,777 1,040
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss $ (1,058) $ 1,078 $ 6,777 $ 1,040