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Fair Value of Assets and Liabilities - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Allowance for Credit Losses $ 1,145,000      
Other real estate owned 4,794,000   $ 4,984,000  
Mortgage servicing rights (MSR) impairment (recovery) 65,000      
Mortgage Servicing Rights        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Finite-lived intangible assets, net 432,000 $ 551,000 420,000 $ 516,000
Mortgage servicing rights (MSR) impairment (recovery) (106,000) $ (210,000) $ (544,000)  
Fair Value, Nonrecurring        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Carrying amount of loans with a specific allowance 5,741,000      
Fair value of loans with a specific allowance 4,596,000      
Allowance for Credit Losses 1,145,000      
Fair Value, Nonrecurring | Mortgage Servicing Rights        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Indefinite-lived contractual rights 367,000      
Finite-lived intangible assets, net 432,000      
Fair Value, Nonrecurring | Carrying Amount        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Other real estate owned 4,794,000      
Fair Value, Nonrecurring | Fair Value        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Other real estate owned $ 28,000