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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, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mortgage servicing rights [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights [1] $ 350 $ 357 $ 364 $ 322
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 $ 350 $ 357    
Prepayment Rate [Member] | Minimum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.057 0.0648    
Prepayment Rate [Member] | Maximum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.2069 0.2349    
Prepayment Rate [Member] | Weighted Average [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs [2] 0.0778 0.0778    
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 0.095 0.095    
Discount Rate [Member] | Maximum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.095 0.095    
Discount Rate [Member] | Weighted Average [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs [2] 0.0900 0.0950    
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 0.0182 0.0213    
Delinquency Rate [Member] | Maximum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.0247 0.0279    
Delinquency Rate [Member] | Weighted Average [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs [2] 0.0236 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 0.0014 0.0014    
Default Rate [Member] | Maximum [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs 0.002 0.002    
Default Rate [Member] | Weighted Average [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage Servicing Rights, Measuring Inputs [2] 0.0015 0.0015    
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.