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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, 2019 | Dec. 31, 2018
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 466,943 | $ 516,022
GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 347,000 | 111,000
FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 413,000 | 94,000
Trading account debt securities |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 458,758 | 494,820
Trading account debt securities | GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 347,396 | 412,500
Trading account debt securities | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 111,362 | 82,320
Mortgage Servicing Rights |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 8,185 | 9,337
Debt securities available-for-sale |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized |  | 11,865
Debt securities available-for-sale | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized |  | 11,865
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 | Mortgage Servicing Rights |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 1 | Debt securities available-for-sale |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized |  | 0
Level 1 | Debt securities available-for-sale | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized |  | 0
Level 2 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 458,758 | 506,685
Level 2 | Trading account debt securities |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 458,758 | 494,820
Level 2 | Trading account debt securities | GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 347,396 | 412,500
Level 2 | Trading account debt securities | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 111,362 | 82,320
Level 2 | Mortgage Servicing Rights |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 2 | Debt securities available-for-sale |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized |  | 11,865
Level 2 | Debt securities available-for-sale | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized |  | 11,865
Level 3 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 8,185 | 9,337
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 | Mortgage Servicing Rights |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 8,185 | 9,337
Level 3 | Debt securities available-for-sale |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized |  | 0
Level 3 | Debt securities available-for-sale | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized |  | $ 0

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