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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)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Servicing Asset, Valuation Technique [Extensible List] [1] us-gaap:ValuationTechniqueDiscountedCashFlowMember us-gaap:ValuationTechniqueDiscountedCashFlowMember    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage servicing rights [Member]        
Mortgage Servicing Rights [2] $ 350 $ 322 $ 329 $ 273
Fair Value, Inputs, Level 3 [Member] | Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage servicing rights [Member]        
Servicing Asset, Valuation Technique [Extensible List] us-gaap:ValuationTechniqueDiscountedCashFlowMember us-gaap:ValuationTechniqueDiscountedCashFlowMember    
Mortgage Servicing Rights $ 350 $ 322    
Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member]        
Mortgage Servicing Rights, Measuring Inputs 6.81 6.63    
Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Discount Rate [Member] | Fair Value, Measurements, Recurring [Member]        
Mortgage Servicing Rights, Measuring Inputs 9.00 9.00    
Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Delinquency Rate [Member] | Fair Value, Measurements, Recurring [Member]        
Mortgage Servicing Rights, Measuring Inputs 2.73 2.82    
Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Default Rate [Member] | Fair Value, Measurements, Recurring [Member]        
Mortgage Servicing Rights, Measuring Inputs 0.08 0.08    
Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member]        
Mortgage Servicing Rights, Measuring Inputs 24.78 25.56    
Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Discount Rate [Member] | Fair Value, Measurements, Recurring [Member]        
Mortgage Servicing Rights, Measuring Inputs 9.00 9.00    
Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Delinquency Rate [Member] | Fair Value, Measurements, Recurring [Member]        
Mortgage Servicing Rights, Measuring Inputs 3.61 3.63    
Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Default Rate [Member] | Fair Value, Measurements, Recurring [Member]        
Mortgage Servicing Rights, Measuring Inputs 0.14 0.14    
Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] | Prepayment Rate [Member] | Fair Value, Measurements, Recurring [Member]        
Mortgage Servicing Rights, Measuring Inputs [1] 10.10 13.39    
Mortgage Servicing Rights Prepayment Rate Prepayment Rate    
Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] | Discount Rate [Member] | Fair Value, Measurements, Recurring [Member]        
Mortgage Servicing Rights, Measuring Inputs [1] 9.00 9.00    
Mortgage Servicing Rights Discount Rate Discount Rate    
Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] | Delinquency Rate [Member] | Fair Value, Measurements, Recurring [Member]        
Mortgage Servicing Rights, Measuring Inputs [1] 2.88 2.96    
Mortgage Servicing Rights Delinquency Rate Delinquency Rate    
Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] | Default Rate [Member] | Fair Value, Measurements, Recurring [Member]        
Mortgage Servicing Rights, Measuring Inputs [1] 0.13 0.13    
Mortgage Servicing Rights Default Rate Default Rate    
[1] Unobservable inputs for mortgage servicing rights were weighted by loan amount.
[2] 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 income.