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Securities - Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]    
Due in 1 year or less, Amortized Cost $ 111,105  
Due after 1 year through 5 years, Amortized Cost 1,559,155  
Due after 5 years through 10 years, Amortized Cost 774,933  
Due after 10 years, Amortized Cost 832,392  
Total, Amortized Cost 3,277,585  
Mortgage-backed securities, Amortized Cost 4,715,018  
Amortized Cost 7,992,603 $ 11,822,584
Due in 1 year or less, Fair Value 109,852  
Due after 1 year through 5 years, Fair Value 1,486,824  
Due after 5 years through 10 years, Fair Value 716,042  
Due after 10 years, Fair Value 705,991  
Total, Fair Value 3,018,709  
Mortgage-backed securities, Fair Value 4,109,568  
Total securities available for sale, Fair Value $ 7,128,277 $ 11,976,514