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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
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings $ 17,196 $ 4,629 $ 21,028 $ 8,946
Liabilitiy - Gains (Losses) included in earnings   0   (6,112)
Change in unrealized gain loss - Fair value assets (13,664) 12 (14,408) 17
Change in unrealized gain loss - fair value liabilities   0   0
Gain (loss) included in earnings (17,196) (4,629) (21,028) (15,058)
Change in unrealized gain loss (13,664) 12 (14,408) 17
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   0
Mortgage banking activities        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings (17,186) (4,622) (21,011) (8,929)
Change in unrealized gain loss - Fair value assets (13,671) 0 (14,418) 0
Trading gains losses        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings (10) (7) (17) (17)
Change in unrealized gain loss - Fair value assets $ 7 $ 12 $ 10 $ 17