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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
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized $ 38,332 $ 305,597
Level 1    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0
Level 2    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 37,345 300,279
Level 3    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 987 5,318
Trading account debt securities    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 37,345 300,279
Trading account debt securities | Level 1    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0
Trading account debt securities | Level 2    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 37,345 300,279
Trading account debt securities | Level 3    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0
Trading account debt securities | GNMA    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 2,488 169,352
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 2,488 169,352
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 34,857 122,422
Trading account debt securities | FNMA | Level 1    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0
Trading account debt securities | FNMA | Level 2    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 34,857 122,422
Trading account debt securities | FNMA | Level 3    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0
Trading account debt securities | FHLMC    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized   8,505
Trading account debt securities | FHLMC | Level 1    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized   0
Trading account debt securities | FHLMC | Level 2    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized   8,505
Trading account debt securities | FHLMC | Level 3    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized   0
Mortgage Servicing Rights    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 987 5,318
Mortgage Servicing Rights | Level 1    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0
Mortgage Servicing Rights | Level 2    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0
Mortgage Servicing Rights | Level 3    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized $ 987 $ 5,318