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Investment Securities - Summary of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands		Dec. 31, 2025	Dec. 31, 2024
Amortized Cost
Maturing within 1 year		$ 12,514
After 1 year through 5 years		269,131
After 5 years through 10 years		880,536
After 10 years		9,304,797
Total available-for-sale		10,466,978	$ 9,720,415
Fair Value
Maturing within 1 year		12,495
After 1 year through 5 years		265,399
After 5 years through 10 years		851,880
After 10 years		8,879,726
Total available-for-sale	[1]	$ 10,009,500	$ 9,006,600
[1] Investment securities available-for-sale had an amortized cost basis of $10,466,978 at December 31, 2025, and $9,720,415 at December 31, 2024.

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