Fair Value Measurement - Quantitative Information about (Level 3) Fair Value Measurements for Financial Instruments Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Individually evaluated loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 5,619	$ 5,719
Foreclosed assets (Commerical real estate)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 175
Foreclosed assets (Residential real estate)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 311