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Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Investments Debt And Equity Securities [Abstract]    
Due in 1 year or less, Amortized Cost $ 282,095  
Due after 1 year through 5 years, Amortized Cost 1,128,049  
Due after 5 years through 10 years, Amortized Cost 846,560  
Due after 10 years, Amortized Cost 359,005  
Total, Amortized Cost 2,615,709  
Mortgage-backed securities, Amortized Cost 3,267,134  
Amortized Cost 5,882,843 $ 6,558,715
Due in 1 year or less, Fair Value 282,264  
Due after 1 year through 5 years, Fair Value 1,136,754  
Due after 5 years through 10 years, Fair Value 849,476  
Due after 10 years, Fair Value 357,044  
Total, Fair Value 2,625,538  
Mortgage-backed securities, Fair Value 3,223,422  
Total securities available for sale, Fair Value $ 5,848,960 $ 6,466,334