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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
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 1,761,000 | $ 2,250,000
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 | 1,718,000 | 2,205,000
Level 3 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 43,000 | 45,000
Trading account debt securities |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 1,718,000 | 2,205,000
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 | 1,718,000 | 2,205,000
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 | 0 | 1,100,000
Trading account debt securities | GNMA | Level 1 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized |  | 0
Trading account debt securities | GNMA | Level 2 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized |  | 1,100,000
Trading account debt securities | GNMA | Level 3 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized |  | 0
Trading account debt securities | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 1,718,000 | 1,105,000
Trading account debt securities | FNMA | Level 1 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Trading account debt securities | FNMA | Level 2 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 1,718,000 | 1,105,000
Trading account debt securities | FNMA | Level 3 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Mortgage Servicing Rights |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 43,000 | 45,000
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 | $ 43,000 | $ 45,000

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- Definition Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Asset Obtained as Proceeds + References No definition available. + Details
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