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Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Available-for-Sale Within one year, Amortized Cost | $ 146,855 | $ 93,251
Available-for-Sale Over one year through five years, Amortized Cost | 84,422 | 133,408
Available-for-Sale Over five years through ten years, Amortized Cost | 207,212 | 90,772
Available-for-Sale Over ten years, Amortized Cost | 533,876 | 687,132
Amortized Cost | 972,365 | 1,004,563
Available-for-Sale Within one year, Estimated Fair Value | 146,209 | 92,646
Available-for-Sale Over one year through five years, Estimated Fair Value | 82,859 | 129,556
Available-for-Sale Over five years through ten years, Estimated Fair Value | 188,195 | 81,833
Available-for-Sale Over ten years, Estimated Fair Value | 487,458 | 601,763
Estimated fair value | $ 904,721 | $ 905,798

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- 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 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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- 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 second through fifth 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 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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