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Note Fair value measurement (Gains and losses (realized and unrealized) included in earnings for level 3 assets and liabilities) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
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 $ (6,020) $ (8,420)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (7,385) (443)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss (745) (3,772)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss (7,385) (443)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings (13,405) (8,863)
Fair Value Assets And Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss Total (8,130) (4,215)
Interest Income    
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 0 (2)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 0 0
Mortgage Banking Activities    
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 (5,954) (8,477)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss (723) (3,866)
Trading Gains Losses    
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 (66) 59
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss (22) 94
FDIC Loss Share Expense Income    
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 (7,385) (443)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss $ (7,385) $ (443)