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Fair Value - Summary of Quantitative Information about Level 3 Fair Value Measurements of Assets Measured on a Nonrecurring Basis (Detail) - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Selling Costs [Member] | Appraised Value Technique [Member]    
Disclosure Of Other Real Estate Owned Measured On Nonrecurring Vasis Valuation Techniques [Line Items]    
Collateral dependent loans $ 3,053 $ 6,954
Valuation Technique Discounted appraised value technique Discounted appraised value technique
Unobservable input Selling Costs Selling Costs
Range 5.00%  
Selling Costs [Member] | Sales Price Technique [Member]    
Disclosure Of Other Real Estate Owned Measured On Nonrecurring Vasis Valuation Techniques [Line Items]    
OREO   $ 279
Valuation Technique   Discounted sales price technique
Unobservable Input   Selling Costs
Range   7.00%
Selling Costs [Member] | Maximum [Member] | Appraised Value Technique [Member]    
Disclosure Of Other Real Estate Owned Measured On Nonrecurring Vasis Valuation Techniques [Line Items]    
Range   15.00%
Selling Costs [Member] | Minimum [Member] | Appraised Value Technique [Member]    
Disclosure Of Other Real Estate Owned Measured On Nonrecurring Vasis Valuation Techniques [Line Items]    
Range   7.00%
Discount Rate [Member] | Probability Weighted Expected Return Technique [Member]    
Disclosure Of Other Real Estate Owned Measured On Nonrecurring Vasis Valuation Techniques [Line Items]    
Other equity investments $ 3,006 $ 3,006
Valuation technique Probability weighted expected return technique Probability weighted expected return technique
Unobservable input Discount Rate Discount Rate
Range 20.00% 20.00%
Discount Rate [Member] | Discounted Cash Flows Technique [Member]    
Disclosure Of Other Real Estate Owned Measured On Nonrecurring Vasis Valuation Techniques [Line Items]    
Range 20.00%  
Collateral in nonperforming loan converted to equity $ 222  
Valuation technique Discounted cash flows technique  
Unobservable Input Discount Rate