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Securities - Contractual Maturity Information for Securities Held to Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
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Investments, Debt and Equity Securities [Abstract] |  |
Due in 1 year or less, Amortized Cost | $ 124,608 |
Due after 1 year through 5 years, Amortized Cost | 420,999 |
Due after 5 years through 10 years, Amortized Cost | 862,412 |
Due after 10 years, Amortized Cost | 1,831,915 |
Total, Amortized cost | 3,239,934 |
Mortgage-backed securities, Amortized cost | 2,463,304 |
Amortized Cost | 5,703,238 | $ 5,724,227
Due in 1 year or less, Fair Value | 124,506 |
Due after 1 year through 5 years, Fair Value | 410,094 |
Due after 5 years through 10 years, Fair Value | 823,822 |
Due after 10 years, Fair Value | 1,658,445 |
Total, Fair value | 3,016,867 |
Mortgage-backed securities, Fair value | 2,155,697 |
Total securities held to maturity, Fair value | $ 5,172,564 | $ 5,250,465

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