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Securities - Contractual Maturity Information for Securities Held to Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Due in 1 year or less, Amortized Cost | $ 157,934 |
Due after 1 year through 5 years, Amortized Cost | 378,358 |
Due after 5 years through 10 years, Amortized Cost | 875,003 |
Due after 10 years, Amortized Cost | 1,669,229 |
Total, Amortized cost | 3,080,524 |
Mortgage-backed securities, Amortized cost | 2,573,708 |
Amortized Cost | 5,654,232 | $ 5,378,912
Due in 1 year or less, Fair Value | 157,342 |
Due after 1 year through 5 years, Fair Value | 368,805 |
Due after 5 years through 10 years, Fair Value | 836,790 |
Due after 10 years, Fair Value | 1,506,210 |
Total, Fair value | 2,869,147 |
Mortgage-backed securities, Fair value | 2,250,554 |
Total securities held to maturity, Fair value | $ 5,119,701 | $ 4,748,938

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