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Securities - Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]    
Due in 1 year or less, Amortized Cost $ 123,219  
Due after 1 year through 5 years, Amortized Cost 1,141,112  
Due after 5 years through 10 years, Amortized Cost 699,721  
Due after 10 years, Amortized Cost 1,254,944  
Total, Amortized Cost 3,218,996  
Mortgage-backed securities, Amortized Cost 5,679,853  
Amortized Cost 8,898,849 $ 11,822,584
Due in 1 year or less, Fair Value 123,499  
Due after 1 year through 5 years, Fair Value 1,121,962  
Due after 5 years through 10 years, Fair Value 686,107  
Due after 10 years, Fair Value 1,210,303  
Total, Fair Value 3,141,871  
Mortgage-backed securities, Fair Value 5,408,222  
Total securities available for sale, Fair Value $ 8,550,093 $ 11,976,514