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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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