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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
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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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