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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
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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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