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Scheduled Maturities of Certificates of Deposit Intangibles (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Time deposits by maturity    
1 year or less $ 5,897,172  
More than 1 year through 2 years 2,461,847  
More than 2 years through 3 years 209,389  
More than 3 years through 4 years 42,485  
More than 4 years through 5 years 21,907  
Over 5 years 10,846  
Total CDs $ 8,643,646 $ 7,577,170