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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, 2021 | Dec. 31, 2020
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 743,847 | $ 515,307
GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 380,000 | 332,000
FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 330,000 | 176,000
FHLMC |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 23,000 |
Trading account debt securities |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 732,533 | 508,071
Trading account debt securities | GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 380,228 | 332,207
Trading account debt securities | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 329,617 | 175,864
Trading account debt securities | FHLMC |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 22,688 |
Mortgage Servicing Rights |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 11,314 | 7,236
Level 1 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 1 | Trading account debt securities |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 1 | Trading account debt securities | GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 1 | Trading account debt securities | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 1 | Trading account debt securities | FHLMC |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 |
Level 1 | Mortgage Servicing Rights |  |
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 | 732,533 | 508,071
Level 2 | Trading account debt securities |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 732,533 | 508,071
Level 2 | Trading account debt securities | GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 380,228 | 332,207
Level 2 | Trading account debt securities | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 329,617 | 175,864
Level 2 | Trading account debt securities | FHLMC |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 22,688 |
Level 2 | Mortgage Servicing Rights |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 3 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 11,314 | 7,236
Level 3 | Trading account debt securities |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 3 | Trading account debt securities | GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 3 | Trading account debt securities | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 3 | Trading account debt securities | FHLMC |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 |
Level 3 | Mortgage Servicing Rights |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 11,314 | $ 7,236

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