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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

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