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Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]    
Due in 1 year or less, Amortized Cost $ 327,988  
Due after 1 year through 5 years, Amortized Cost 917,975  
Due after 5 years through 10 years, Amortized Cost 733,789  
Due after 10 years, Amortized Cost 383,989  
Total, Amortized Cost 2,363,741  
Mortgage-backed securities, Amortized Cost 3,778,032  
Amortized Cost 6,141,773 $ 6,334,018
Due in 1 year or less, Fair Value 327,198  
Due after 1 year through 5 years, Fair Value 906,234  
Due after 5 years through 10 years, Fair Value 708,373  
Due after 10 years, Fair Value 370,558  
Total, Fair Value 2,312,363  
Mortgage-backed securities, Fair Value 3,620,378  
Total securities available for sale, Fair Value $ 5,932,741 $ 6,258,577