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Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period $ 16,903 $ 18,113 $ 18,113  
Additions:        
(Release of) provision for loan losses (2,500) 0    
Deductions:        
Loans charged off 166 107    
Less recoveries on loans (42) (355)    
Net loan charge-offs (recoveries) 124 (248)    
Balance at end of period $ 14,279 18,361 16,903 $ 18,113
Amount of PPP loans funded during the period     47,500 88,400
Percentage credit guarantee from the SBA for the PPP loans 100.00%      
Allowance for PPP loans $ 0      
SBA PPP loans, net $ 2,300      
Paycheck protection program interest rate 1.00%      
Commercial, Financial, & Agricultural        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period $ 2,717 5,121 5,121  
Additions:        
(Release of) provision for loan losses 128 (567)    
Deductions:        
Loans charged off 35 27    
Less recoveries on loans (20) (149)    
Net loan charge-offs (recoveries) 15 (122)    
Balance at end of period 2,830 4,676 2,717 5,121
SBA PPP loans, net 2,300      
Residential real estate        
Deductions:        
SBA PPP loans, net     8,400  
Residential real estate | Construction        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 137 213 213  
Additions:        
(Release of) provision for loan losses (77) 83    
Deductions:        
Loans charged off 0 0    
Less recoveries on loans 0 (13)    
Net loan charge-offs (recoveries) 0 (13)    
Balance at end of period 60 309 137 213
Residential real estate | Mortgages        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 2,482 2,679 2,679  
Additions:        
(Release of) provision for loan losses 93 (253)    
Deductions:        
Loans charged off 0 0    
Less recoveries on loans (3) (168)    
Net loan charge-offs (recoveries) (3) (168)    
Balance at end of period 2,578 2,594 2,482 2,679
Commercial real estate | Construction        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 588 475 475  
Additions:        
(Release of) provision for loan losses 76 57    
Deductions:        
Loans charged off 0 0    
Less recoveries on loans 0 0    
Net loan charge-offs (recoveries) 0 0    
Balance at end of period 664 532 588 475
Commercial real estate | Mortgages        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 10,662 9,354 9,354  
Additions:        
(Release of) provision for loan losses (2,897) 573    
Deductions:        
Loans charged off 75 23    
Less recoveries on loans (2) 0    
Net loan charge-offs (recoveries) 73 23    
Balance at end of period 7,692 9,904 10,662 9,354
Installment and Other Consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 256 264 264  
Additions:        
(Release of) provision for loan losses 56 13    
Deductions:        
Loans charged off 56 57    
Less recoveries on loans (17) (25)    
Net loan charge-offs (recoveries) 39 32    
Balance at end of period 273 245 256 264
Un- allocated        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 61 7 7  
Additions:        
(Release of) provision for loan losses 121 94    
Deductions:        
Loans charged off 0 0    
Less recoveries on loans 0 0    
Net loan charge-offs (recoveries) 0 0    
Balance at end of period $ 182 $ 101 $ 61 $ 7