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Investment Securities - Summary of Equity Securities (Detail) - Equity Securities [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |
Net gains recognized during the period on equity securities sold | $ 0 | $ 4,602
Unrealized gains recognized during the period on equity securities still held at period end | 11,445 | 4,259
Unrealized losses recognized during the period on equity securities still held at period end | (275) | (285)
Net gains recognized during the period | $ 11,170 | $ 8,576

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