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Transfers of financial assets and servicing assets - Initial fair value of assets obtained as proceeds from residential mortgage loans securitized (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized $ 2,673 $ 13,759 $ 4,923 $ 25,003
Level 1        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Level 2        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 2,601 13,393 4,806 24,359
Level 3        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 72 366 117 644
Trading account debt securities        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 2,601 13,393 4,806 24,359
Trading account debt securities | Level 1        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Trading account debt securities | Level 2        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 2,601 13,393 4,806 24,359
Trading account debt securities | Level 3        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Trading account debt securities | GNMA        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized     1,100 1,067
Trading account debt securities | GNMA | Level 1        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized     0 0
Trading account debt securities | GNMA | Level 2        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized     1,100 1,067
Trading account debt securities | GNMA | Level 3        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized     0 0
Trading account debt securities | FNMA        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 2,601 13,393 3,706 23,292
Trading account debt securities | FNMA | Level 1        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Trading account debt securities | FNMA | Level 2        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 2,601 13,393 3,706 23,292
Trading account debt securities | FNMA | Level 3        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Mortgage Servicing Rights        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 72 366 117 644
Mortgage Servicing Rights | Level 1        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Mortgage Servicing Rights | Level 2        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Mortgage Servicing Rights | Level 3        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized $ 72 $ 366 $ 117 $ 644