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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings $ 2,255 $ (6,260) $ 3,258 $ (5,757)
Changes in unrealized gains (losses) included in earnings relating to assets still held 5,319 (2,031) 9,577 3,135
Mortgage banking activities        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings 2,258 (6,249) 3,275 (5,737)
Changes in unrealized gains (losses) included in earnings relating to assets still held 5,318 (2,036) 9,571 3,126
Trading account (loss) profit        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings (3) (11) (17) (20)
Changes in unrealized gains (losses) included in earnings relating to assets still held $ 1 $ 5 $ 6 $ 9