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Investment Securities - Summary of Equity Securities (Detail) - Equity Securities [Member] - USD ($)
$ in Thousands
12 Months Ended
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