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Loans, Major Classifications of Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans gross $ 1,379,521 $ 1,369,445    
Allowance for loan losses 5,530 5,506 $ 5,679 $ 5,728
Total 1,373,991 1,363,939    
Loans and Leases Receivable, Net of Deferred Income 1,379,521 1,369,445    
Loans and Leases Receivable, Deferred Income 928 961    
Commercial and industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans gross 105,809 101,598    
Allowance for loan losses 1,297 1,095 957 816
Loans and Leases Receivable, Net of Deferred Income 105,809 101,598    
Commercial, secured by real estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans gross 904,562 887,679    
Allowance for loan losses 3,494 3,607 3,634 3,903
Loans and Leases Receivable, Net of Deferred Income 904,562 887,679    
Residential real estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans gross 328,574 335,106    
Allowance for loan losses 639 665 919 837
Loans and Leases Receivable, Net of Deferred Income 328,574 335,106    
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans gross 32,541 34,291    
Allowance for loan losses 73 105 131 153
Loans and Leases Receivable, Net of Deferred Income 32,541 34,291    
Agricultural [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans gross 7,990 10,649    
Allowance for loan losses 18 30 39 28
Loans and Leases Receivable, Net of Deferred Income 7,990 10,649    
Other loans, including deposit overdrafts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans gross 45 122    
Allowance for loan losses 9 4 $ (1) $ (9)
Loans and Leases Receivable, Net of Deferred Income $ 45 $ 122