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Securities - Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]    
Due in 1 year or less, Amortized Cost $ 176,590  
Due after 1 year through 5 years, Amortized Cost 554,388  
Due after 5 years through 10 years, Amortized Cost 758,469  
Due after 10 years, Amortized Cost 2,148,857  
Total, Amortized Cost 3,638,304  
Mortgage-backed securities, Amortized Cost 6,424,272  
Amortized Cost 10,062,576 $ 8,887,734
Due in 1 year or less, Fair Value 177,655  
Due after 1 year through 5 years, Fair Value 570,849  
Due after 5 years through 10 years, Fair Value 785,408  
Due after 10 years, Fair Value 2,282,287  
Total, Fair Value 3,816,199  
Mortgage-backed securities, Fair Value 6,531,332  
Total securities available for sale, Fair Value $ 10,347,531 $ 9,299,688