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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Gains (Losses) included in earnings $ (8,519) $ (36,716) $ (25,514)
Liabilitiy - Gains (Losses) included in earnings (6,112) (11,700) (32,778)
Change in unrealized gain loss - Fair value assets 8,725 (18,947) (4,788)
Change in unrealized gain loss - fair value liabilities 0 (11,700) (32,778)
Gain (loss) included in earnings (14,631) (48,416) (58,292)
Change in unrealized gain loss 8,725 (30,647) (37,566)
Interest Income      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Gains (Losses) included in earnings 0 0 (3)
Change in unrealized gain loss - Fair value assets 0 0 0
Mortgage Banking Activities      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Gains (Losses) included in earnings (8,477) (36,519) (25,336)
Change in unrealized gain loss - Fair value assets 8,703 (18,986) (4,745)
Trading Gains Losses      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Gains (Losses) included in earnings (42) (197) (175)
Change in unrealized gain loss - Fair value assets 22 39 (43)
FDIC Loss Share Expense Income      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Liabilitiy - Gains (Losses) included in earnings (6,112) (11,700) (33,413)
Change in unrealized gain loss - fair value liabilities 0 (11,700) (33,413)
Other Income      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Liabilitiy - Gains (Losses) included in earnings 0 0 635
Change in unrealized gain loss - fair value liabilities $ 0 $ 0 $ 635