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Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]    
Due in 1 year or less, Amortized Cost $ 325,043  
Due after 1 year through 5 years, Amortized Cost 999,207  
Due after 5 years through 10 years, Amortized Cost 750,393  
Due after 10 years, Amortized Cost 300,367  
Total, Amortized Cost 2,375,010  
Mortgage-backed securities, Amortized Cost 3,809,164  
Amortized Cost 6,184,174 $ 6,334,018
Due in 1 year or less, Fair Value 324,844  
Due after 1 year through 5 years, Fair Value 992,435  
Due after 5 years through 10 years, Fair Value 730,715  
Due after 10 years, Fair Value 290,734  
Total, Fair Value 2,338,728  
Mortgage-backed securities, Fair Value 3,672,956  
Total securities available for sale, Fair Value $ 6,011,684 $ 6,258,577