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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

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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