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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, 2024
Dec. 31, 2023
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized $ 15,462 $ 38,332
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 15,160 37,345
Level 3    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 302 987
Trading account debt securities    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 15,160 37,345
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 15,160 37,345
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 6,783 2,488
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 6,783 2,488
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 8,377 34,857
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 8,377 34,857
Trading account debt securities | FNMA | Level 3    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0
Mortgage Servicing Rights    
Assets    
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 302 987
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 $ 302 $ 987