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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, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Maturing within 1 year | $ 10,463 |
After 1 year through 5 years | 169,137 |
After 5 years through 10 years | 273,639 |
After 10 years | 7,516,433 |
Amortized Cost | 7,969,672 | $ 8,444,362
Fair Value |  |
Maturing within 1 year | 10,465 |
After 1 year through 5 years | 164,773 |
After 5 years through 10 years | 269,539 |
After 10 years | 6,723,806 |
Fair Value | $ 7,168,583 | $ 7,453,123

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