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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
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).