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Loans and Allowance for Credit Losses - Allowance for Credit Losses and Balances in Loan Portfolio (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance $ 14,582,000 $ 7,416,000 $ 7,619,000 $ 7,688,000  
Charge-offs (261,000) (175,000) (532,000) (560,000)  
Recoveries 113,000 116,000 288,000 229,000  
Provision 438,000 100,000 332,000 100,000  
Ending balance 14,872,000 7,457,000 14,872,000 7,457,000  
Individually evaluated for credit loss   157,000   157,000 $ 153,000
Collectively evaluated for credit loss   7,300,000   7,300,000 7,466,000
Individually evaluated for credit loss 484,000   484,000    
Collectively evaluated for credit loss 14,388,000   14,388,000    
Individually evaluated for impairment         2,846,000
Collectively evaluated for impairment         1,172,662,000
Individually evaluated for credit loss 3,148,000   3,148,000    
Collectively evaluated for credit loss 1,306,652,000   1,306,652,000    
Acquired with deteriorated credit quality         14,274,000
Loans 1,309,800,000   1,309,800,000   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 78,000 132,000 144,000 448,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 5,000 8,000 (75,000) (308,000)  
Ending balance 83,000 140,000 83,000 140,000  
Individually evaluated for credit loss   1,000   1,000 2,000
Collectively evaluated for credit loss   139,000   139,000 142,000
Individually evaluated for credit loss 3,000   3,000    
Collectively evaluated for credit loss 80,000   80,000    
Individually evaluated for impairment         23,000
Collectively evaluated for impairment         64,136,000
Individually evaluated for credit loss 65,000   65,000    
Collectively evaluated for credit loss 43,225,000   43,225,000    
Acquired with deteriorated credit quality         0
Loans 43,290,000   43,290,000   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 2,896,000 1,613,000 1,361,000 1,454,000  
Charge-offs (73,000) (47,000) (73,000) (177,000)  
Recoveries 28,000 59,000 57,000 62,000  
Provision (328,000) (252,000) (409,000) 34,000  
Ending balance 2,523,000 1,373,000 2,523,000 1,373,000  
Individually evaluated for credit loss   6,000   6,000 14,000
Collectively evaluated for credit loss   1,367,000   1,367,000 1,347,000
Individually evaluated for credit loss 89,000   89,000    
Collectively evaluated for credit loss 2,434,000   2,434,000    
Individually evaluated for impairment         177,000
Collectively evaluated for impairment         206,074,000
Individually evaluated for credit loss 269,000   269,000    
Collectively evaluated for credit loss 222,088,000   222,088,000    
Acquired with deteriorated credit quality         3,959,000
Loans 222,357,000   222,357,000   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 885,000 309,000 310,000 290,000  
Charge-offs (161,000) (128,000) (432,000) (383,000)  
Recoveries 80,000 56,000 208,000 162,000  
Provision 22,000 66,000 199,000 234,000  
Ending balance 826,000 303,000 826,000 303,000  
Individually evaluated for credit loss   1,000   1,000 1,000
Collectively evaluated for credit loss   302,000   302,000 309,000
Individually evaluated for credit loss 0   0    
Collectively evaluated for credit loss 826,000   826,000    
Individually evaluated for impairment         7,000
Collectively evaluated for impairment         39,793,000
Individually evaluated for credit loss 6,000   6,000    
Collectively evaluated for credit loss 37,599,000   37,599,000    
Acquired with deteriorated credit quality         8,000
Loans 37,605,000   37,605,000   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 7,237,000 4,224,000 4,822,000 3,705,000  
Charge-offs 0 0 0 0  
Recoveries 0 1,000 13,000 3,000  
Provision 908,000 384,000 304,000 901,000  
Ending balance 8,145,000 4,609,000 8,145,000 4,609,000  
Individually evaluated for credit loss   6,000   6,000 5,000
Collectively evaluated for credit loss   4,603,000   4,603,000 4,817,000
Individually evaluated for credit loss 347,000   347,000    
Collectively evaluated for credit loss 7,798,000   7,798,000    
Individually evaluated for impairment         165,000
Collectively evaluated for impairment         622,131,000
Individually evaluated for credit loss 1,070,000   1,070,000    
Collectively evaluated for credit loss 708,890,000   708,890,000    
Acquired with deteriorated credit quality         8,657,000
Loans 709,960,000   709,960,000   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 70,000 45,000 63,000 110,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0    
Provision (19,000) 14,000 (32,000) (51,000)  
Ending balance 51,000 59,000 51,000 59,000  
Individually evaluated for credit loss   0   0 0
Collectively evaluated for credit loss   59,000   59,000 63,000
Individually evaluated for credit loss 0   0    
Collectively evaluated for credit loss 51,000   51,000    
Individually evaluated for impairment         0
Collectively evaluated for impairment         14,736,000
Individually evaluated for credit loss 0   0    
Collectively evaluated for credit loss 16,477,000   16,477,000    
Acquired with deteriorated credit quality         0
Loans 16,477,000   16,477,000   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 3,376,000 691,000 906,000 671,000  
Charge-offs (27,000) 0 (27,000)    
Recoveries 5,000 0 10,000 2,000  
Provision (150,000) 178,000 305,000 196,000  
Ending balance 3,204,000 869,000 3,204,000 869,000  
Individually evaluated for credit loss   143,000   143,000 131,000
Collectively evaluated for credit loss   726,000   726,000 775,000
Individually evaluated for credit loss 45,000   45,000    
Collectively evaluated for credit loss 3,159,000   3,159,000    
Individually evaluated for impairment         2,474,000
Collectively evaluated for impairment         225,792,000
Individually evaluated for credit loss 1,738,000   1,738,000    
Collectively evaluated for credit loss 254,610,000   254,610,000    
Acquired with deteriorated credit quality         1,650,000
Loans 256,348,000   256,348,000   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    
Loans To Other Financial Institutions [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 40,000        
Provision     40,000    
Ending balance 40,000   40,000    
Collectively evaluated for credit loss 40,000   40,000    
Collectively evaluated for credit loss 23,763,000   23,763,000    
Loans 23,763,000   23,763,000    
Unallocated Financing Receivables [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 0 402,000 13,000 1,010,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 0 (298,000) 0 (906,000)  
Ending balance 0 104,000 0 104,000  
Individually evaluated for credit loss   0   0 0
Collectively evaluated for credit loss   $ 104,000   $ 104,000 $ 13,000
Individually evaluated for credit loss 0   0    
Collectively evaluated for credit loss $ 0   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)