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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, 2024
Mar. 31, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 15,685,000 $ 7,619,000  
Charge-offs (124,000) (140,000)  
Recoveries 73,000 112,000  
Provision 403,000 309,000  
Ending balance 16,037,000 15,065,000  
Individually evaluated for credit loss   52,000 $ 60,000
Collectively evaluated for credit loss   15,013,000 15,625,000
Individually evaluated for credit loss 262,000    
Collectively evaluated for credit loss 15,775,000    
Individually evaluated for impairment     2,079,000
Collectively evaluated for impairment     1,408,574,000
Individually evaluated for credit loss 2,479,000    
Collectively evaluated for credit loss 1,416,111,000    
Acquired with deteriorated credit quality     0
Loans 1,418,590,000   1,410,653,000
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 94,000 144,000  
Charge-offs 0 0  
Recoveries 0 0  
Provision 3,000 (23,000)  
Ending balance 97,000 135,000  
Individually evaluated for credit loss   1,000 2,000
Collectively evaluated for credit loss   134,000 92,000
Individually evaluated for credit loss 2,000    
Collectively evaluated for credit loss 95,000    
Individually evaluated for impairment     54,000
Collectively evaluated for impairment     49,156,000
Individually evaluated for credit loss 44,000    
Collectively evaluated for credit loss 41,906,000    
Acquired with deteriorated credit quality     0
Loans 41,950,000   49,210,000
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 2,216,000 1,361,000  
Charge-offs (1,000) 0  
Recoveries 9,000 27,000  
Provision 19,000 45,000  
Ending balance 2,243,000 3,020,000  
Individually evaluated for credit loss   7,000 6,000
Collectively evaluated for credit loss   3,013,000 2,210,000
Individually evaluated for credit loss 7,000    
Collectively evaluated for credit loss 2,236,000    
Individually evaluated for impairment     136,000
Collectively evaluated for impairment     229,779,000
Individually evaluated for credit loss 174,000    
Collectively evaluated for credit loss 231,048,000    
Acquired with deteriorated credit quality     0
Loans 231,222,000   229,915,000
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 823,000 310,000  
Charge-offs (123,000) (140,000)  
Recoveries 60,000 69,000  
Provision 158,000 133,000  
Ending balance 918,000 913,000  
Individually evaluated for credit loss   1,000 0
Collectively evaluated for credit loss   912,000 823,000
Individually evaluated for credit loss 116,000    
Collectively evaluated for credit loss 802,000    
Individually evaluated for impairment     2,000
Collectively evaluated for impairment     36,539,000
Individually evaluated for credit loss 238,000    
Collectively evaluated for credit loss 34,030,000    
Acquired with deteriorated credit quality     0
Loans 34,268,000   36,541,000
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 8,820,000 4,822,000  
Charge-offs 0 0  
Recoveries 0 13,000  
Provision 347,000 (4,000)  
Ending balance 9,167,000 7,837,000  
Individually evaluated for credit loss   1,000 1,000
Collectively evaluated for credit loss   7,836,000 8,819,000
Individually evaluated for credit loss 1,000    
Collectively evaluated for credit loss 9,166,000    
Individually evaluated for impairment     29,000
Collectively evaluated for impairment     786,892,000
Individually evaluated for credit loss 29,000    
Collectively evaluated for credit loss 794,676,000    
Acquired with deteriorated credit quality     0
Loans 794,705,000   786,921,000
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 58,000 63,000  
Charge-offs 0 0  
Recoveries 0 0  
Provision (9,000) (10,000)  
Ending balance 49,000 73,000  
Individually evaluated for credit loss   0 0
Collectively evaluated for credit loss   73,000 58,000
Individually evaluated for credit loss 0    
Collectively evaluated for credit loss 49,000    
Individually evaluated for impairment     0
Collectively evaluated for impairment     20,936,000
Individually evaluated for credit loss 0    
Collectively evaluated for credit loss 17,890,000    
Acquired with deteriorated credit quality     0
Loans 17,890,000   20,936,000
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 3,644,000 906,000  
Charge-offs 0 0  
Recoveries 4,000 3,000  
Provision (135,000) 168,000  
Ending balance 3,513,000 3,087,000  
Individually evaluated for credit loss   42,000 51,000
Collectively evaluated for credit loss   3,045,000 3,593,000
Individually evaluated for credit loss 136,000    
Collectively evaluated for credit loss 3,377,000    
Individually evaluated for impairment     1,858,000
Collectively evaluated for impairment     265,872,000
Individually evaluated for credit loss 1,994,000    
Collectively evaluated for credit loss 266,529,000    
Acquired with deteriorated credit quality     0
Loans 268,523,000   267,730,000
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  
Loans To Other Financial Institutions [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 30,000    
Charge-offs 0    
Recoveries 0    
Provision 20,000    
Ending balance 50,000    
Individually evaluated for credit loss     0
Collectively evaluated for credit loss     30,000
Individually evaluated for credit loss 0    
Collectively evaluated for credit loss 50,000    
Individually evaluated for impairment     0
Collectively evaluated for impairment     19,400,000
Individually evaluated for credit loss 0    
Collectively evaluated for credit loss 30,032,000    
Loans $ 30,032,000   $ 19,400,000
Unallocated Financing Receivables [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance   13,000  
Charge-offs   0  
Recoveries   0  
Provision   0  
Ending balance   0  
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)