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Securities - Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Due in 1 year or less, Amortized Cost $ 898,944  
Due after 1 year through 5 years, Amortized Cost 1,452,834  
Due after 5 years through 10 years, Amortized Cost 612,812  
Due after 10 years, Amortized Cost 505,589  
Total, Amortized Cost 3,470,179  
Mortgage-backed securities, Amortized Cost 4,315,860  
Amortized Cost 7,786,039 $ 7,692,860
Due in 1 year or less, Fair Value 892,089  
Due after 1 year through 5 years, Fair Value 1,422,180  
Due after 5 years through 10 years, Fair Value 574,807  
Due after 10 years, Fair Value 447,102  
Total, Fair Value 3,336,178  
Mortgage-backed securities, Fair Value 3,771,195  
Total securities available for sale, Fair Value $ 7,107,373 $ 7,068,613