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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, 2022
Mar. 31, 2021
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized $ 145,111 $ 191,077
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 142,702 188,268
Level 3    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 2,409 2,809
Trading account debt securities    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 142,702 188,268
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 142,702 188,268
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 77,894 101,988
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 77,894 101,988
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 57,690 86,280
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 57,690 86,280
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 2,409 2,809
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 $ 2,409 $ 2,809