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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
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount $ 1,883,556 [1] $ 2,108,993 $ 2,301,024
Accretable yield 1,092,504 [2] 1,214,488 $ 1,288,983
Non-credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount 1,400,000 1,600,000  
Accretable yield $ 800,000 $ 900,000  
[1]
At December 31, 2018, includes $1.4 billion of loans considered non-credit impaired at the acquisition date (December 31, 2017 - $1.6 billion).
[2]
At December 31, 2018, includes $0.8 billion for loans considered non-credit impaired at the acquisition date (December 31, 2017 - $0.9 billion).