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Securities - Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]    
Due in 1 year or less, Amortized Cost $ 485,239  
Due after 1 year through 5 years, Amortized Cost 913,024  
Due after 5 years through 10 years, Amortized Cost 606,539  
Due after 10 years, Amortized Cost 1,326,293  
Total, Amortized Cost 3,331,095  
Mortgage-backed securities, Amortized Cost 3,942,467  
Amortized Cost 7,273,562 $ 6,670,090
Due in 1 year or less, Fair Value 485,975  
Due after 1 year through 5 years, Fair Value 923,492  
Due after 5 years through 10 years, Fair Value 617,529  
Due after 10 years, Fair Value 1,391,409  
Total, Fair Value 3,418,405  
Mortgage-backed securities, Fair Value 3,993,503  
Total securities available for sale, Fair Value $ 7,411,908 $ 6,542,800