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Securities - Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Investments Debt And Equity Securities [Abstract]    
Due in 1 year or less, Amortized Cost $ 537,915  
Due after 1 year through 5 years, Amortized Cost 1,322,690  
Due after 5 years through 10 years, Amortized Cost 634,591  
Due after 10 years, Amortized Cost 498,260  
Total, Amortized Cost 2,993,456  
Mortgage-backed securities, Amortized Cost 4,213,875  
Amortized Cost 7,207,331 $ 7,692,860
Due in 1 year or less, Fair Value 532,285  
Due after 1 year through 5 years, Fair Value 1,291,442  
Due after 5 years through 10 years, Fair Value 600,319  
Due after 10 years, Fair Value 443,162  
Total, Fair Value 2,867,208  
Mortgage-backed securities, Fair Value 3,674,183  
Total securities available for sale, Fair Value $ 6,541,391 $ 7,068,613