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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
Mar. 31, 2023
Mar. 31, 2022
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized $ 11,244 $ 145,111
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 10,966 142,702
Level 3    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 278 2,409
Trading account debt securities    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 10,966 142,702
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 10,966 142,702
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 1,067 77,894
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 1,067 77,894
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 9,899 57,690
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 9,899 57,690
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   7,118
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   7,118
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 278 2,409
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 $ 278 $ 2,409