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Fair Value - Summary of changes in corporate bonds and MSRs using level 3 inputs (Detail) - Level 3 [Member] - Fair Value, Recurring [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Corporate Bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of December 31, 2024	$ 750
Called security available for sale	(250)
Fair value adjustments	0
Balance as of September 30, 2025	500
MSRs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of December 31, 2024	386
Called security available for sale	0
Fair value adjustments	(185)
Balance as of September 30, 2025	$ 201

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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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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of increase (decrease) in the amortized amount from a decrease (increase) in the valuation allowance applied to the servicing asset for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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