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Securities - Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]    
Due in 1 year or less, Amortized Cost $ 172,698  
Due after 1 year through 5 years, Amortized Cost 1,677,013  
Due after 5 years through 10 years, Amortized Cost 803,950  
Due after 10 years, Amortized Cost 549,384  
Total, Amortized Cost 3,203,045  
Mortgage-backed securities, Amortized Cost 4,574,905  
Amortized Cost 7,777,950 $ 11,822,584
Due in 1 year or less, Fair Value 170,616  
Due after 1 year through 5 years, Fair Value 1,612,729  
Due after 5 years through 10 years, Fair Value 759,939  
Due after 10 years, Fair Value 480,941  
Total, Fair Value 3,024,225  
Mortgage-backed securities, Fair Value 3,982,122  
Total securities available for sale, Fair Value $ 7,006,347 $ 11,976,514