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Securities - Summary of Contractual Maturity Information for Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Due in 1 year or less, Amortized Cost	$ 565,899
Due after 1 year through 5 years, Amortized Cost	2,535,587
Due after 5 years through 10 years, Amortized Cost	624,238
Due after 10 years, Amortized Cost	1,860,597
Total, Amortized Cost	5,586,321
Mortgage-backed securities, Amortized Cost	8,160,828
Amortized Cost	13,747,149	$ 8,407,676
Due in 1 year or less, Fair Value	564,700
Due after 1 year through 5 years, Fair Value	2,545,738
Due after 5 years through 10 years, Fair Value	616,146
Due after 10 years, Fair Value	1,809,421
Total, Fair Value	5,536,005
Mortgage-backed securities, Fair Value	7,842,275
Total securities available for sale, Fair Value	$ 13,378,280	$ 7,774,334

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