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Note Transfers of financial assets and servicing assets (Initial fair value of assets obtained as proceeds from residential mortgage loans securitized) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 138,659 | $ 108,091 | $ 399,278 | $ 461,273
GNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 110,000 | 86,000 | 320,000 | 369,000
FNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 26,000 | 21,000 | 72,000 | 86,000
Trading account securities |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 133,536 | 102,174 | 382,622 | 438,458
Trading account securities | GNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 109,911 | 85,722 | 319,769 | 368,660
Trading account securities | FNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 23,625 | 16,452 | 62,853 | 69,798
Mortgage Servicing Rights |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 2,625 | 1,588 | 7,198 | 6,766
Available-for-sale debt securities |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 2,498 | 4,329 | 9,458 | 16,049
Available-for-sale debt securities | FNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 2,498 | 4,329 | 9,458 | 16,049
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 securities |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Level 1 | Trading account 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 securities | FNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 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 1 | Available-for-sale debt securities |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Level 1 | Available-for-sale debt securities | FNMA |  |  |  |
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 | 136,034 | 106,503 | 392,080 | 454,507
Level 2 | Trading account securities |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 133,536 | 102,174 | 382,622 | 438,458
Level 2 | Trading account securities | GNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 109,911 | 85,722 | 319,769 | 368,660
Level 2 | Trading account securities | FNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 23,625 | 16,452 | 62,853 | 69,798
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 2 | Available-for-sale debt securities |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 2,498 | 4,329 | 9,458 | 16,049
Level 2 | Available-for-sale debt securities | FNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 2,498 | 4,329 | 9,458 | 16,049
Level 3 |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 2,625 | 1,588 | 7,198 | 6,766
Level 3 | Trading account securities |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Level 3 | Trading account 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 securities | FNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Level 3 | Mortgage Servicing Rights |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 2,625 | 1,588 | 7,198 | 6,766
Level 3 | Available-for-sale debt securities |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0 | 0 | 0
Level 3 | Available-for-sale debt securities | FNMA |  |  |  |
Assets |  |  |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 0 | $ 0 | $ 0 | $ 0

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