Fair Value Measurement - Schedule of Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Fair Value Inputs Asset Quantitative Information [Line Items]
Other real estate owned and repossessed assets	$ 1,784	$ 907
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Collateral dependent loans	27,643	20,400
Other real estate owned and repossessed assets	1,784	907
Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Collateral dependent loans	27,643	20,400
Other real estate owned and repossessed assets	$ 1,784	$ 907
Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Minimum [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Collateral dependent loans, Appraisal adjustments	(0.00%)	0.00%
Collateral dependent loans, Liquidation expenses	(3.60%)	(8.20%)
Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Maximum [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Collateral dependent loans, Appraisal adjustments	(27.80%)	(20.80%)
Collateral dependent loans, Liquidation expenses	(10.50%)	(10.50%)
Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Weighted Average [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Collateral dependent loans, Appraisal adjustments	(5.20%)	(7.30%)
Collateral dependent loans, Liquidation expenses	(9.80%)	(9.70%)