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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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