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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Gain (loss) included in earnings $ (11,631) $ 9,336 $ (10,318)
Changes in unrealized gains (losses) included in earnings relating to assets still held (512) 11,943 6,364
Mortgage banking activities      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Gain (loss) included in earnings (11,589) 166 (10,216)
Changes in unrealized gains (losses) included in earnings relating to assets still held (529) 11,964 6,410
Trading account (loss) profit      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Gain (loss) included in earnings (42) (71) (102)
Changes in unrealized gains (losses) included in earnings relating to assets still held 17 (21) (46)
Other operating income      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract      
Gain (loss) included in earnings 0 9,241 0
Changes in unrealized gains (losses) included in earnings relating to assets still held $ 0 $ 0 $ 0