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Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Detail) - Assets Measured at Fair Value on a Nonrecurring Basis [Member] - (Level 3) [Member] - Collateral-Dependent Loans [Member] $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 6,982 | $ 19,177
Valuation Technique | Appraisals which utilize sales comparison, net income and cost approach | Appraisals which utilize sales comparison, net income and cost approach
Discounts for Collection Issues and Changes in Market Conditions [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 10 | 10
Discounts for Collection Issues and Changes in Market Conditions [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 40 | 75
Discounts for Collection Issues and Changes in Market Conditions [Member] | Weighted Average [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Input | 23 | 25

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