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Securities - Contractual Maturity Information for Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Due in 1 year or less, Amortized Cost	$ 157,934
Due after 1 year through 5 years, Amortized Cost	378,358
Due after 5 years through 10 years, Amortized Cost	875,003
Due after 10 years, Amortized Cost	1,669,229
Total, Amortized cost	3,080,524
Mortgage-backed securities, Amortized cost	2,573,708
Amortized Cost	5,654,232	$ 5,378,912
Due in 1 year or less, Fair Value	157,342
Due after 1 year through 5 years, Fair Value	368,805
Due after 5 years through 10 years, Fair Value	836,790
Due after 10 years, Fair Value	1,506,210
Total, Fair value	2,869,147
Mortgage-backed securities, Fair value	2,250,554
Total securities held to maturity, Fair value	$ 5,119,701	$ 4,748,938

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