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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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 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 $ (25,514) $ (13,301) $ (25,346)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (32,778) 12,292 (1,791)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss (4,788) 6,106 (6,343)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss (32,778) 12,292 (1,791)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings (58,292) (1,009) (27,137)
Fair Value Assets And Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss Total (37,566) 18,398 (8,134)
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 (3) (2) (31)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 0 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 (25,336) (13,349) (24,773)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss (4,745) 6,087 (6,120)
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 (175) 50 (542)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss (43) 19 (223)
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 (33,413) 9,559 (1,791)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss (33,413) 9,559 (1,791)
Other 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 635 2,733 0
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss $ 635 $ 2,733 $ 0