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Investment Securities - Summary of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Amortized Cost
Maturing within 1 year		$ 6,343
After 1 year through 5 years		248,409
After 5 years through 10 years		626,884
After 10 years		8,838,779
Total available-for-sale		9,720,415	$ 9,668,422
Fair Value
Maturing within 1 year		6,322
After 1 year through 5 years		243,204
After 5 years through 10 years		576,872
After 10 years		8,180,202
Total available-for-sale	[1]	$ 9,006,600	$ 8,959,729
[1] Investment securities available-for-sale had an amortized cost basis of $9,720,415 at December 31, 2024, and $9,668,422 at December 31, 2023.

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