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Securities - Contractual Maturity Information for Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Due in 1 year or less, Amortized Cost	$ 124,608
Due after 1 year through 5 years, Amortized Cost	420,999
Due after 5 years through 10 years, Amortized Cost	862,412
Due after 10 years, Amortized Cost	1,831,915
Total, Amortized cost	3,239,934
Mortgage-backed securities, Amortized cost	2,463,304
Amortized Cost	5,703,238	$ 5,724,227
Due in 1 year or less, Fair Value	124,506
Due after 1 year through 5 years, Fair Value	410,094
Due after 5 years through 10 years, Fair Value	823,822
Due after 10 years, Fair Value	1,658,445
Total, Fair value	3,016,867
Mortgage-backed securities, Fair value	2,155,697
Total securities held to maturity, Fair value	$ 5,172,564	$ 5,250,465

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