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Securities - Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Due in 1 year or less, Amortized Cost	$ 170,215
Due after 1 year through 5 years, Amortized Cost	599,514
Due after 5 years through 10 years, Amortized Cost	771,983
Due after 10 years, Amortized Cost	2,105,399
Total, Amortized Cost	3,647,111
Mortgage-backed securities, Amortized Cost	7,309,736
Amortized Cost	10,956,847	$ 8,887,734
Due in 1 year or less, Fair Value	171,325
Due after 1 year through 5 years, Fair Value	614,809
Due after 5 years through 10 years, Fair Value	795,782
Due after 10 years, Fair Value	2,210,553
Total, Fair Value	3,792,469
Mortgage-backed securities, Fair Value	7,370,221
Total securities available for sale, Fair Value	$ 11,162,690	$ 9,299,688

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