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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings $ (20,501) $ (4,855) $ (33,387) $ (25,883)
Change in unrealized gain loss - Fair value assets (7,892) (1,569) (15,265) (15,979)
Mortgage banking activities        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings (20,491) (4,842) (33,360) (25,853)
Change in unrealized gain loss - Fair value assets (7,892) (1,575) (15,278) (15,993)
Trading gains losses        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings (10) (13) (27) (30)
Change in unrealized gain loss - Fair value assets $ 0 $ 6 $ 13 $ 14