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Loans and Allowance for Loan and Lease Losses - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Loan
Mar. 31, 2022
USD ($)
Contract
Mar. 31, 2022
USD ($)
DebtSecurityNumber
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Loan
Dec. 31, 2021
USD ($)
Contract
Dec. 31, 2021
USD ($)
DebtSecurityNumber
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                    
Loans Pledged as Collateral $ 69,300 $ 69,300 $ 69,300 $ 69,300 $ 66,600 $ 66,600 $ 66,600 $ 66,600    
Loans and Leases Receivable, Related Parties, Ending Balance 300       300          
Loans and Leases Receivable, Related Parties, Additions 0       0          
Loans and Leases Receivable, Related Parties, Proceeds 2,000       100          
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest 2,200 2,200 2,200 2,200 2,000 2,000 2,000 2,000    
Financing Receivable, Troubled Debt Restructuring 100 100 100 100 100 100 100 100    
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 18       52          
Interest Income Recorded 6 $ 6 6 $ 6 30 $ 30 30 $ 30    
Number of loans   0   7   2   7    
Financing Receivable, Restructuring Recorded Investment With Nonaccrual Status         600 $ 600 600 $ 600    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition 0 $ 0 $ 0 $ 0 0 0 $ 0 0    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract     0       0      
Loans, allowance for loan losses 8,484 8,484 $ 8,484 8,484 8,320 8,320 $ 8,320 8,320 $ 7,475 $ 7,470
Restructured Loan Modified through Extended Maturity and Payment Schedule Modification [Member]                    
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                    
Financing Receivable, Restructuring Recorded Investment With Nonaccrual Status 500 500 500 500            
Loans, allowance for loan losses 7 7 7 7 $ 7 $ 7 $ 7 $ 7    
Minimum [Member]                    
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                    
Loans Modified in a Troubled Debt Restructuring, Individually Evaluated for Impairment, Principal Balance, Threshold 500 500 500 500            
Minimum [Member] | ALC [Member]                    
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                    
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest $ 50 $ 50 $ 50 $ 50            
Real Estate [Member]                    
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                    
Percentage of Loan Portfolio 51.60% 51.60% 51.60% 51.60% 54.00% 54.00% 54.00% 54.00%