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Loans and Allowance for Credit Losses - Allowance for Credit Losses and Balances in Loan Portfolio (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 7,619,000 $ 7,688,000  
Charge-offs (140,000) (143,000)  
Recoveries 112,000 56,000  
Provision 309,000 0  
Ending balance 15,065,000 7,601,000  
Individually evaluated for impairment   548,000 $ 153,000
Collectively evaluated for impairment   7,053,000 7,466,000
Individually evaluated for credit loss 52,000    
Collectively evaluated for credit loss 15,013,000    
Individually evaluated for impairment   4,940,000 2,846,000
Collectively evaluated for impairment   1,006,826,000 1,172,662,000
Individually evaluated for credit loss 2,151,000    
Collectively evaluated for credit loss 1,208,432,000    
Acquired with deteriorated credit quality   15,640,000 14,274,000
Loans 1,210,583,000 1,027,406,000 1,189,782,000
Cumulative Effect of Change in Accounting Principle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 7,165,000    
Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 144,000 448,000  
Charge-offs 0 0  
Recoveries 0 0  
Provision (23,000) (61,000)  
Ending balance 135,000 387,000  
Individually evaluated for impairment   253,000 2,000
Collectively evaluated for impairment   134,000 142,000
Individually evaluated for credit loss 1,000    
Collectively evaluated for credit loss 134,000    
Individually evaluated for impairment   2,542,000 23,000
Collectively evaluated for impairment   59,076,000 64,136,000
Individually evaluated for credit loss 18,000    
Collectively evaluated for credit loss 55,977,000    
Acquired with deteriorated credit quality   0 0
Loans 55,995,000 61,618,000 64,159,000
Agricultural [Member] | Cumulative Effect of Change in Accounting Principle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 14,000    
Commercial and Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 1,361,000 1,454,000  
Charge-offs 0 (31,000)  
Recoveries 27,000 2,000  
Provision 45,000 327,000  
Ending balance 3,020,000 1,752,000  
Individually evaluated for impairment   116,000 14,000
Collectively evaluated for impairment   1,636,000 1,347,000
Individually evaluated for credit loss 7,000    
Collectively evaluated for credit loss 3,013,000    
Individually evaluated for impairment   356,000 177,000
Collectively evaluated for impairment   194,024,000 206,074,000
Individually evaluated for credit loss 180,000    
Collectively evaluated for credit loss 216,883,000    
Acquired with deteriorated credit quality   4,534,000 3,959,000
Loans 217,063,000 198,914,000 210,210,000
Commercial and Industrial [Member] | Cumulative Effect of Change in Accounting Principle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 1,587,000    
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 310,000 290,000  
Charge-offs (140,000) (112,000)  
Recoveries 69,000 52,000  
Provision 133,000 74,000  
Ending balance 913,000 304,000  
Individually evaluated for impairment   3,000 1,000
Collectively evaluated for impairment   301,000 309,000
Individually evaluated for credit loss 1,000    
Collectively evaluated for credit loss 912,000    
Individually evaluated for impairment   32,000 7,000
Collectively evaluated for impairment   36,108,000 39,793,000
Individually evaluated for credit loss 27,000    
Collectively evaluated for credit loss 38,864,000    
Acquired with deteriorated credit quality   11,000 8,000
Loans 38,891,000 36,151,000 39,808,000
Consumer Portfolio Segment [Member] | Cumulative Effect of Change in Accounting Principle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 541,000    
Commercial Real Estate Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 4,822,000 3,705,000  
Charge-offs 0 0  
Recoveries 13,000 1,000  
Provision (4,000) (16,000)  
Ending balance 7,837,000 3,690,000  
Individually evaluated for impairment   9,000 5,000
Collectively evaluated for impairment   3,681,000 4,817,000
Individually evaluated for credit loss 1,000    
Collectively evaluated for credit loss 7,836,000    
Individually evaluated for impairment   157,000 165,000
Collectively evaluated for impairment   527,743,000 622,131,000
Individually evaluated for credit loss 32,000    
Collectively evaluated for credit loss 648,170,000    
Acquired with deteriorated credit quality   9,352,000 8,657,000
Loans 648,202,000 537,252,000 630,953,000
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect of Change in Accounting Principle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 3,006,000    
Construction Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 63,000 110,000  
Charge-offs 0 0  
Recoveries 0 0  
Provision (10,000) (73,000)  
Ending balance 73,000 37,000  
Individually evaluated for impairment   0 0
Collectively evaluated for impairment   37,000 63,000
Individually evaluated for credit loss 0    
Collectively evaluated for credit loss 73,000    
Individually evaluated for impairment   0 0
Collectively evaluated for impairment   15,669,000 14,736,000
Individually evaluated for credit loss 0    
Collectively evaluated for credit loss 13,939,000    
Acquired with deteriorated credit quality   0 0
Loans 13,939,000 15,669,000 14,736,000
Construction Real Estate [Member] | Cumulative Effect of Change in Accounting Principle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 20,000    
Residential Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 906,000 671,000  
Charge-offs 0 0  
Recoveries 3,000 1,000  
Provision 168,000 (83,000)  
Ending balance 3,087,000 589,000  
Individually evaluated for impairment   167,000 131,000
Collectively evaluated for impairment   422,000 775,000
Individually evaluated for credit loss 42,000    
Collectively evaluated for credit loss 3,045,000    
Individually evaluated for impairment   1,853,000 2,474,000
Collectively evaluated for impairment   174,206,000 225,792,000
Individually evaluated for credit loss 1,894,000    
Collectively evaluated for credit loss 234,599,000    
Acquired with deteriorated credit quality   1,743,000 1,650,000
Loans 236,493,000 177,802,000 229,916,000
Residential Portfolio Segment [Member] | Cumulative Effect of Change in Accounting Principle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 2,010,000    
Unallocated Financing Receivables [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 13,000 1,010,000  
Charge-offs 0 0  
Recoveries 0 0  
Provision 0 (168,000)  
Ending balance 0 842,000  
Individually evaluated for impairment   0 0
Collectively evaluated for impairment   $ 842,000 $ 13,000
Individually evaluated for credit loss 0    
Collectively evaluated for credit loss 0    
Unallocated Financing Receivables [Member] | Cumulative Effect of Change in Accounting Principle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ (13,000)