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Securities - Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]
Due in 1 year or less, Amortized Cost	$ 108,437
Due after 1 year through 5 years, Amortized Cost	1,571,301
Due after 5 years through 10 years, Amortized Cost	760,248
Due after 10 years, Amortized Cost	983,891
Total, Amortized Cost	3,423,877
Mortgage-backed securities, Amortized Cost	4,893,628
Amortized Cost	8,317,505	$ 11,822,584
Due in 1 year or less, Fair Value	108,364
Due after 1 year through 5 years, Fair Value	1,533,973
Due after 5 years through 10 years, Fair Value	727,509
Due after 10 years, Fair Value	882,785
Total, Fair Value	3,252,631
Mortgage-backed securities, Fair Value	4,486,585
Total securities available for sale, Fair Value	$ 7,739,216	$ 11,976,514

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