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Note Loans (Changes in the carrying amount and the accretable yield for the acquired loans) (Parenthetical) (Detail) - ASC Subtopic 310-30 - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying amount | $ 1,990,622 | [1] | $ 2,033,457 | $ 2,108,993 | $ 2,133,946 | [1] | $ 2,168,664 | $ 2,301,024
Accretable yield | 1,122,732 | [2] | $ 1,178,042 | $ 1,214,488 | 1,199,344 | [2] | $ 1,245,672 | $ 1,288,983
Non-credit Impaired Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying amount | 1,500,000 |  |  |  | 1,600,000 |  |  |
Accretable yield | $ 800,000 |  |  |  | $ 900,000 |  |  |
[1] | At September 30, 2018, includes $1.5 billion of loans considered non-credit impaired at the acquisition date (September 30, 2017 - $1.6 billion).
[2] | At September 30, 2018, includes $0.8 billion of loans considered non-credit impaired at the acquisition date (September 30, 2017 - $0.9 billion).

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