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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, 2019
Mar. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract    
Gains (Losses) included in earnings $ (3,832) $ (4,317)
Liabilitiy - Gains (Losses) included in earnings   (6,112)
Change in unrealized gain loss - Fair value assets (744) 5
Change in unrealized gain loss - fair value liabilities   (6,112)
Gain (loss) included in earnings (3,832) (10,429)
Change in unrealized gain loss (744) (6,107)
FDIC Loss Share Expense Income    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract    
Liabilitiy - Gains (Losses) included in earnings 0 (6,112)
Change in unrealized gain loss - fair value liabilities 0 (6,112)
Mortgage banking activities    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract    
Gains (Losses) included in earnings (3,825) (4,307)
Change in unrealized gain loss - Fair value assets (747) 0
Trading gains losses    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract    
Gains (Losses) included in earnings (7) (10)
Change in unrealized gain loss - Fair value assets $ 3 $ 5