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Securities - Contractual Maturity Information for Securities Held to Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Investments Debt And Equity Securities [Abstract] |  |
Due in 1 year or less, Amortized Cost | $ 69,922 |
Due after 1 year through 5 years, Amortized Cost | 348,925 |
Due after 5 years through 10 years, Amortized Cost | 709,203 |
Due after 10 years, Amortized Cost | 1,693,224 |
Total, Amortized cost | 2,821,274 |
Mortgage-backed securities, Amortized cost | 3,016,432 |
Amortized Cost | 5,837,706 | $ 1,480,416
Due in 1 year or less, Fair Value | 68,678 |
Due after 1 year through 5 years, Fair Value | 331,530 |
Due after 5 years through 10 years, Fair Value | 618,054 |
Due after 10 years, Fair Value | 1,425,289 |
Total, Fair value | 2,443,551 |
Mortgage-backed securities, Fair value | 2,636,255 |
Total securities held to maturity, Fair value | $ 5,079,806 | $ 1,442,391

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