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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 167,879 | $ 155,703 | $ 554,621 | $ 311,836
Trading account debt securities |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 165,282 | 153,966 | 546,335 | 307,512
Trading account debt securities | GNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 84,896 | 99,576 | 293,613 | 213,608
Trading account debt securities | FNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 76,118 | 54,390 | 234,953 | 93,904
Trading account debt securities | FHLMC |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 4,268 |  | 17,769 |
Mortgage Servicing Rights |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 2,597 | 1,737 | 8,286 | 4,324
Level 1 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 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 | 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 | 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 | 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 |  | 0 |
Level 1 | Mortgage Servicing Rights |  |  |  |
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 | 165,282 | 153,966 | 546,335 | 307,512
Level 2 | Trading account debt securities |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 165,282 | 153,966 | 546,335 | 307,512
Level 2 | Trading account debt securities | GNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 84,896 | 99,576 | 293,613 | 213,608
Level 2 | Trading account debt securities | FNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 76,118 | 54,390 | 234,953 | 93,904
Level 2 | Trading account debt securities | FHLMC |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 4,268 |  | 17,769 |
Level 2 | Mortgage Servicing Rights |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Level 3 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 2,597 | 1,737 | 8,286 | 4,324
Level 3 | Trading account debt securities |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 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 | 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 | 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 |  | 0 |
Level 3 | Mortgage Servicing Rights |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 2,597 | $ 1,737 | $ 8,286 | $ 4,324

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