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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, 2024 | Dec. 31, 2023
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Investments, Debt and Equity Securities [Abstract] |  |
Available-for-Sale Within one year, Amortized Cost | $ 106,686 | $ 62,521
Available-for-Sale Over one year through five years, Amortized Cost | 138,320 | 169,176
Available-for-Sale Over five years through ten years, Amortized Cost | 84,350 | 83,720
Available-for-Sale Over ten years, Amortized Cost | 658,142 | 651,614
Amortized Cost | 987,498 | 967,031
Available-for-Sale Within one year, Estimated Fair Value | 105,700 | 61,828
Available-for-Sale Over one year through five years, Estimated Fair Value | 135,241 | 160,983
Available-for-Sale Over five years through ten years, Estimated Fair Value | 77,074 | 77,608
Available-for-Sale Over ten years, Estimated Fair Value | 590,906 | 565,320
Estimated fair value | $ 908,921 | $ 865,739

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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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