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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
Mar. 31, 2022
Mar. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract    
Gains (Losses) included in earnings $ 1,003 $ 503
Changes in unrealized gains (losses) included in earnings relating to assets still held 4,256 5,166
Mortgage banking activities    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract    
Gains (Losses) included in earnings 1,017 512
Changes in unrealized gains (losses) included in earnings relating to assets still held 4,252 5,162
Trading account (loss) profit    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract    
Gains (Losses) included in earnings (14) (9)
Changes in unrealized gains (losses) included in earnings relating to assets still held $ 4 $ 4