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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
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 $ (4,629) $ (8,077) $ (8,946) $ (14,097)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 (3,125) (6,112) (10,510)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 12 (2,885) 17 (3,630)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss 0 (3,125) 0 (10,510)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings (4,629) (11,202) (15,058) (24,607)
Fair Value Assets And Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss Total 12 (6,010) 17 (14,140)
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 (4,622) (8,046) (8,929) (14,000)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 0 (2,899) 0 (3,622)
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 (7) (31) (17) (97)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 12 14 17 (8)
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 0 (3,125) (6,112) (10,510)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss $ 0 $ (3,125) $ 0 $ (10,510)