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Transfers of financial assets and servicing assets - Changes in MSRs measured using the fair value method - Parenthetical (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]        
Servicing asset at fair value amount $ 113,386 $ 118,109 $ 121,249 $ 128,350
PB        
Servicing Assets at Fair Value [Line Items]        
Servicing asset at fair value amount $ 1,900   $ 1,900