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Loans and ALLL (Narrative) (Details)
 3 Months Ended
Mar. 31, 2023
USD ($)
loan
Mar. 31, 2022
USD ($)
loan
Dec. 31, 2022
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Threshold period of continuous performance to return loans to accrual status 6 months    
Advance in connection with impaired loans $ 0    
Loans in default | loan 0 0  
Loans and Leases Receivable, Net of Deferred Income $ 1,270,651,000   $ 1,264,173,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan $ 1.0000   1.0000
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Troubled Debt Restructuring   $ 98,000  
Minimum [Member] | 4 - Low satisfactory [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Delinquency period 10 days    
Minimum [Member] | 5 - Special mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Delinquency period 30 days    
Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable, amortization term 30 years    
Maximum [Member] | 4 - Low satisfactory [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Delinquency period 30 days    
Maximum [Member] | 5 - Special mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Delinquency period 60 days    
Residential, Junior Liens, Financing Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 3,386,000   3,282,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan $ 0.0027   0.0026
Commercial, Agricultural, and Residential Portfolio Segments [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of days past due (or more), accrual of interest discontinued 90 days    
Total Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maximum days of consumer loan charged off 180 days    
Total Consumer [Member] | Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable, amortization term 15 years    
Commercial And Agricultural Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maximum percentage of loan 0.80    
Commercial And Agricultural Portfolio Segment [Member] | Customer Concentration Risk [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maximum amount of loans $ 18,000,000    
Residential Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maximum percentage of loan 1    
Maximum percentage of principal, interest, taxes and hazard insurance on property over gross income 0.28    
Maximum percentage of debt servicing over gross income 0.40    
Maximum amount without corporation approval $ 1,000,000    
Residential, Privately Insured, Financing Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maximum percentage of loan 0.80    
Commercial Real Estate, Owner Occupied, Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 180,888,000   192,117,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.1424   0.1520
Commercial Real Estate, Owner Occupied, Portfolio Segment | 4 - Low satisfactory [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 134,016,000    
Commercial Real Estate, Owner Occupied, Portfolio Segment | 5 - Special mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 8,346,000    
Commercial Real Estate, Non-owner Occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 219,365,000   204,091,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.1726   0.1614
Commercial Real Estate, Non-owner Occupied | 4 - Low satisfactory [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 194,590,000    
Commercial Real Estate, Non-owner Occupied | 5 - Special mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 10,327,000    
Commercial Real Estate, 1-4 Family Investor, Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 85,217,000   85,278,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.0671   0.0675
Commercial Real Estate, 1-4 Family Investor, Portfolio Segment | 4 - Low satisfactory [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 76,811,000    
Commercial Real Estate, 1-4 Family Investor, Portfolio Segment | 5 - Special mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 883,000    
Commercial Real Estate, Multifamily, Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 80,940,000   84,526,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.0637   0.0669
Commercial Real Estate, Multifamily, Portfolio Segment | 4 - Low satisfactory [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 62,399,000    
Commercial Real Estate, Multifamily, Portfolio Segment | 5 - Special mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 39,000    
Agricultural Mortgage, Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 71,336,000   73,002,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.0561   0.0577
Agricultural Mortgage, Portfolio Segment | 4 - Low satisfactory [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 43,931,000    
Agricultural Mortgage, Portfolio Segment | 5 - Special mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 13,974,000    
Agricultural Other Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 23,424,000   31,983,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.0184   0.0253
Agricultural Other Portfolio Segment [Member] | 4 - Low satisfactory [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 15,897,000    
Agricultural Other Portfolio Segment [Member] | 5 - Special mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 4,507,000    
Residential, Senior Liens, Financing Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 299,784,000   300,225,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.2359   0.2375
Residential, Home Equity Line Of Credit, Financing Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 33,016,000   33,187,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.0260   0.0263
Commercial and Industrial, Secured, Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 169,395,000   161,895,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.1333   0.1280
Commercial and Industrial, Secured, Portfolio Segment | 4 - Low satisfactory [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 119,218,000    
Commercial and Industrial, Secured, Portfolio Segment | 5 - Special mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 9,447,000    
Consumer, Secured, Direct, Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 37,141,000   37,127,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.0292   0.0294
Consumer, Secured, Indirect, Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 43,802,000   37,814,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.0345   0.0298
Consumer, Unsecured, Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 3,167,000   3,113,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.0025   0.0025
Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 189,185,000   178,428,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.1489   0.1411
Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 566,410,000   566,012,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.4458   0.4478
Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 94,760,000   104,985,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.0745   0.0830
Residential Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 336,186,000   336,694,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan 0.2646   0.2664
Consumer Loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 84,110,000   78,054,000
LoanPortfolioClassesAndSegmentsAsPercentageofAggregateLoan $ 0.0662   $ 0.0617