v3.26.1
Fair Values of Assets and Liabilities - Summary of Significant Unobservable Inputs used in Level 3 Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Recurring [Member]
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mortgage servicing rights [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights [1] $ 257 $ 257 $ 280 $ 305
Prepayment Rate [Member] | Mortgage servicing rights [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Servicing Asset, Valuation Technique [Extensible List] us-gaap:ValuationTechniqueDiscountedCashFlowMember us-gaap:ValuationTechniqueDiscountedCashFlowMember    
Mortgage Servicing Rights $ 257 $ 257    
Prepayment Rate [Member] | Minimum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.0485 0.0475    
Prepayment Rate [Member] | Maximum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.2445 0.2919    
Prepayment Rate [Member] | Weighted Average [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs [2] 0.0829 0.0983    
Fair value valuation techniques Prepayment Rate Prepayment Rate    
Discount Rate [Member] | Minimum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.0975 0.095    
Discount Rate [Member] | Maximum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.0975 0.095    
Discount Rate [Member] | Weighted Average [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs [2] 0.0975 0.095    
Fair value valuation techniques Discount Rate Discount Rate    
Delinquency Rate [Member] | Minimum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.021 0.0217    
Delinquency Rate [Member] | Maximum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.0259 0.0257    
Delinquency Rate [Member] | Weighted Average [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs [2] 0.0218 0.0224    
Fair value valuation techniques Delinquency Rate Delinquency Rate    
Default Rate [Member] | Minimum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.0022 0.0016    
Default Rate [Member] | Maximum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.0032 0.002    
Default Rate [Member] | Weighted Average [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs [2] 0.0024 0.0017    
Fair value valuation techniques Default Rate Default Rate    
[1] Realized and unrealized gains and losses related to mortgage servicing rights are reported as a component of loan servicing fee income in the Company’s consolidated statements of (loss) income.
[2] Unobservable inputs for mortgage servicing rights were weighted by loan amount.