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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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