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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 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 $ (10,342) $ (6,101) $ (24,439) $ (18,863)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (3,208) (6,611) (13,718) (14,742)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss (6,239) (1,093) (9,869) (4,208)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss (3,208) (6,611) (13,718) (14,742)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings (13,550) (12,712) (38,157) (33,605)
Fair Value Assets And Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss Total (9,447) (7,704) (23,587) (18,950)
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 0 0 (2)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 0 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 (10,262) (6,062) (24,262) (18,879)
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss (6,241) (1,082) (9,863) (4,315)
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 (80) (39) (177) 18
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss 2 (11) (6) 107
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 (3,208) (6,611) (13,718) (14,742)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss $ (3,208) $ (6,611) $ (13,718) $ (14,742)