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Investment Securities - Summary of Maturities of Securities Available for Sale by Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 298,573
Due after one year through five years, Amortized Cost	527,383
Due after five years through ten years, Amortized Cost	559,647
Due after ten years, Amortized Cost	1,879,257
Amortized Cost	3,264,860	$ 3,282,690
Due in one year or less, Estimated Fair Value	298,193
Due after one year through five years, Estimated Fair Value	494,204
Due after five years through ten years, Estimated Fair Value	521,011
Due after ten years, Estimated Fair Value	1,746,044
Total available for sale securities	$ 3,059,452	$ 2,959,719

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
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-Section 50
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+ References

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

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+ References

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