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Securities - Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Due in 1 year or less, Amortized Cost	$ 776,270
Due after 1 year through 5 years, Amortized Cost	2,284,188
Due after 5 years through 10 years, Amortized Cost	599,727
Due after 10 years, Amortized Cost	1,787,986
Total, Amortized Cost	5,448,171
Mortgage-backed securities, Amortized Cost	8,589,349
Amortized Cost	14,037,520	$ 13,999,900
Due in 1 year or less, Fair Value	777,228
Due after 1 year through 5 years, Fair Value	2,279,354
Due after 5 years through 10 years, Fair Value	589,950
Due after 10 years, Fair Value	1,726,481
Total, Fair Value	5,373,013
Mortgage-backed securities, Fair Value	8,287,873
Total securities available for sale, Fair Value	$ 13,660,886	$ 13,709,141

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