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Securities - Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]    
Due in 1 year or less, Amortized Cost $ 225,943  
Due after 1 year through 5 years, Amortized Cost 842,108  
Due after 5 years through 10 years, Amortized Cost 580,312  
Due after 10 years, Amortized Cost 1,637,031  
Total, Amortized Cost 3,285,394  
Mortgage-backed securities, Amortized Cost 4,067,786  
Amortized Cost 7,353,180 $ 7,323,980
Due in 1 year or less, Fair Value 226,438  
Due after 1 year through 5 years, Fair Value 852,880  
Due after 5 years through 10 years, Fair Value 594,772  
Due after 10 years, Fair Value 1,730,712  
Total, Fair Value 3,404,802  
Mortgage-backed securities, Fair Value 4,234,649  
Total securities available for sale, Fair Value $ 7,639,451 $ 7,447,362