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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 ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 11,900,000 | $ 36,684,000 | $ 36,903,000 | $ 300,051,000
Level 1 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Level 2 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 11,599,000 | 35,875,000 | 35,958,000 | 294,872,000
Level 3 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 301,000 | 809,000 | 945,000 | 5,179,000
Trading account debt securities |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 11,599,000 | 35,875,000 | 35,958,000 | 294,872,000
Trading account debt securities | Level 1 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Trading account debt securities | Level 2 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 11,599,000 | 35,875,000 | 35,958,000 | 294,872,000
Trading account debt securities | Level 3 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Trading account debt securities | GNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 1,421,000 | 14,190,000 | 2,488,000 | 169,352,000
Trading account debt securities | GNMA | Level 1 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Trading account debt securities | GNMA | Level 2 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 1,421,000 | 14,190,000 | 2,488,000 | 169,352,000
Trading account debt securities | GNMA | Level 3 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Trading account debt securities | FNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 10,178,000 | 21,685,000 | 33,470,000 | 117,015,000
Trading account debt securities | FNMA | Level 1 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Trading account debt securities | FNMA | Level 2 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 10,178,000 | 21,685,000 | 33,470,000 | 117,015,000
Trading account debt securities | FNMA | Level 3 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Trading account debt securities | FHLMC |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 |  | 0 | 8,505,000
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 |  |  |  | 8,505,000
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 | 301,000 | 809,000 | 945,000 | 5,179,000
Mortgage Servicing Rights | Level 1 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Mortgage Servicing Rights | Level 2 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Mortgage Servicing Rights | Level 3 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 301,000 | $ 809,000 | $ 945,000 | $ 5,179,000

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