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Investment Securities - Summary Of Debt Securities Held-to Maturity - Contractual Maturities, Credit Quality and Other Information (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Maturing within 1 year | $ 49,231 |
After 1 year through 5 years | 158,778 |
After 5 years through 10 years | 241,456 |
After 10 years | 7,994,897 |
Amortized Cost | 8,444,362 | $ 7,074,797
Fair Value |  |
Maturing within 1 year | 49,217 |
After 1 year through 5 years | 149,418 |
After 5 years through 10 years | 233,792 |
After 10 years | 7,020,696 |
Fair Value | $ 7,453,123 | $ 6,264,623

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