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Fair value measurement - Gains and losses (realized and unrealized) included in earnings for level 3 assets and liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Gains (Losses) included in earnings $ (27,563) $ (8,519) $ (36,716)
Liabilitiy - Gains (Losses) included in earnings   (6,112) 11,700
Change in unrealized gain loss - Fair value assets (14,169) 8,725 (18,947)
Change in unrealized gain loss - fair value liabilities   0 (11,700)
Gain (loss) included in earnings (27,563) (14,631) (48,416)
Change in unrealized gain loss (14,169) 8,725 (30,647)
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) (11,700)
Change in unrealized gain loss - fair value liabilities 0 0 (11,700)
Mortgage banking activities      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Gains (Losses) included in earnings (27,516) (8,477) (36,519)
Change in unrealized gain loss - Fair value assets (14,190) 8,703 (18,986)
Trading gains losses      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Gains (Losses) included in earnings (47) (42) (197)
Change in unrealized gain loss - Fair value assets $ 21 $ 22 $ 39