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Securities - Schedule of Gross Realized Gains and Losses on the Sales and Calls of Securities as well as Gains and Losses on Equity Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Debt securities: |  |  |  |
Gross realized gains | $ 66 |  | $ 284 |
Gross realized losses | (11) | $ (13) | (180) | $ (25)
Net gains (losses) on debt securities | 55 | (13) | 104 | (25)
Equity securities: |  |  |  |
Net unrealized gains recognized on securities still held | 1,155 | 688 | 2,198 | 1,372
Net securities gains | $ 1,210 | $ 675 | $ 2,302 | $ 1,347

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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