Note Loans (Changes in the carrying amount and the accretable yield for the acquired loans) (Parenthetical) (Detail) - ASC Subtopic 310-30 - USD ($) $ in Thousands	Mar. 31, 2019		Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable
Carrying amount	$ 1,831,257	[1]	$ 1,883,556	$ 2,085,191	$ 2,108,993
Accretable yield	1,068,167	[2]	$ 1,092,504	1,204,726	$ 1,214,488
Non-credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable
Carrying amount	1,300,000			1,500,000
Accretable yield	$ 700,000			$ 900,000

[1] At March 31, 2019, includes $1.3 billion of loans considered non-credit impaired at the acquisition date (March 31, 2018 - $1.5 billion).

[2] At March 31, 2019, includes $0.7 billion for loans considered non-credit impaired at the acquisition date (March 31, 2018 - $0.9 billion).