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Fair Value of Financial Instruments (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Gains or losses included in earnings attributable to the change in realized/unrealized gains or losses related to the assets $ 0 $ 0    
Fair value, assets, level 1 to level 2 transfers, amount 0 0    
Fair value, assets, level 2 to level 1 transfer, amount 0 0    
Provision/(credit) for loan losses (419,000) 110,000    
Nonaccrual loans 2,332,000   $ 2,462,000  
Allowance for loan losses (15,292,000) $ (16,554,000) (15,955,000) $ (16,486,000)
Loans 1,181,401,000   1,153,687,000  
Impaired Loans with Specific Allowance: Recorded Investment 374,000   480,000  
Impaired Loans with Specific Allowance: Related Allowance 35,000   64,000  
Impaired Loans with No Specific Allowance: Recorded Investment 5,157,000   5,248,000  
Partial Charge Off [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Nonaccrual loans 600,000   500,000  
Troubled Debt Restructuring [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Provision/(credit) for loan losses 1,300,000   1,300,000  
Allowance for loan losses (100,000)   (400,000)  
Impaired Loans with Specific Allowance: Recorded Investment 800,000   1,000,000.0  
Impaired Loans with Specific Allowance: Related Allowance $ 35,500   $ 64,700