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Loans and Allowance for Credit Losses - Allowance for Credit Losses and Balances in Loan Portfolio (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance $ 15,065,000 $ 7,601,000 $ 7,619,000 $ 7,688,000  
Charge-offs (131,000) (244,000) (271,000) (386,000)  
Recoveries 63,000 59,000 176,000 114,000  
Provision (415,000) 0 (106,000) 0  
Ending balance 14,582,000 7,416,000 14,582,000 7,416,000  
Individually evaluated for credit loss   215,000   215,000 $ 153,000
Collectively evaluated for credit loss   7,201,000   7,201,000 7,466,000
Individually evaluated for credit loss 72,000   72,000    
Collectively evaluated for credit loss 14,510,000   14,510,000    
Individually evaluated for impairment         2,846,000
Collectively evaluated for impairment         1,172,662,000
Individually evaluated for credit loss 2,123,000   2,123,000    
Collectively evaluated for credit loss 1,262,105,000   1,262,105,000    
Acquired with deteriorated credit quality         14,274,000
Loans 1,264,228,000   1,264,228,000   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 136,000 387,000 144,000 448,000  
Charge-offs 0   0    
Recoveries 0   0    
Provision (58,000) (255,000) (80,000) (316,000)  
Ending balance 78,000 132,000 78,000 132,000  
Individually evaluated for credit loss   1,000   1,000 2,000
Collectively evaluated for credit loss   131,000   131,000 142,000
Individually evaluated for credit loss 1,000   1,000    
Collectively evaluated for credit loss 77,000   77,000    
Individually evaluated for impairment         23,000
Collectively evaluated for impairment         64,136,000
Individually evaluated for credit loss 17,000   17,000    
Collectively evaluated for credit loss 40,667,000   40,667,000    
Acquired with deteriorated credit quality         0
Loans 40,684,000   40,684,000   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 3,020,000 1,752,000 1,361,000 1,454,000  
Charge-offs 0 (100,000) 0 (131,000)  
Recoveries 2,000 2,000 29,000 4,000  
Provision (126,000) (41,000) (81,000) 286,000  
Ending balance 2,896,000 1,613,000 2,896,000 1,613,000  
Individually evaluated for credit loss   52,000   52,000 14,000
Collectively evaluated for credit loss   1,561,000   1,561,000 1,347,000
Individually evaluated for credit loss 34,000   34,000    
Collectively evaluated for credit loss 2,862,000   2,862,000    
Individually evaluated for impairment         177,000
Collectively evaluated for impairment         206,074,000
Individually evaluated for credit loss 318,000   318,000    
Collectively evaluated for credit loss 223,873,000   223,873,000    
Acquired with deteriorated credit quality         3,959,000
Loans 224,191,000   224,191,000   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 913,000 304,000 310,000 290,000  
Charge-offs (131,000) (144,000) (271,000) (255,000)  
Recoveries 59,000 55,000 129,000 106,000  
Provision 44,000 94,000 176,000 168,000  
Ending balance 885,000 309,000 885,000 309,000  
Individually evaluated for credit loss   1,000   1,000 1,000
Collectively evaluated for credit loss   308,000   308,000 309,000
Individually evaluated for credit loss 0   0    
Collectively evaluated for credit loss 885,000   885,000    
Individually evaluated for impairment         7,000
Collectively evaluated for impairment         39,793,000
Individually evaluated for credit loss 0   0    
Collectively evaluated for credit loss 38,614,000   38,614,000    
Acquired with deteriorated credit quality         8,000
Loans 38,614,000   38,614,000   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 7,837,000 3,690,000 4,822,000 3,705,000  
Charge-offs 0 0 0    
Recoveries 0 1,000 13,000 2,000  
Provision (600,000) 533,000 (604,000) 517,000  
Ending balance 7,237,000 4,224,000 7,237,000 4,224,000  
Individually evaluated for credit loss   7,000   7,000 5,000
Collectively evaluated for credit loss   4,217,000   4,217,000 4,817,000
Individually evaluated for credit loss 1,000   1,000    
Collectively evaluated for credit loss 7,236,000   7,236,000    
Individually evaluated for impairment         165,000
Collectively evaluated for impairment         622,131,000
Individually evaluated for credit loss 32,000   32,000    
Collectively evaluated for credit loss 657,517,000   657,517,000    
Acquired with deteriorated credit quality         8,657,000
Loans 657,549,000   657,549,000   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 72,000 37,000 63,000 110,000  
Charge-offs 0   0    
Recoveries 0   0    
Provision (2,000) 8,000 (13,000) (65,000)  
Ending balance 70,000 45,000 70,000 45,000  
Individually evaluated for credit loss   0   0 0
Collectively evaluated for credit loss   45,000   45,000 63,000
Individually evaluated for credit loss 0   0    
Collectively evaluated for credit loss 70,000   70,000    
Individually evaluated for impairment         0
Collectively evaluated for impairment         14,736,000
Individually evaluated for credit loss 0   0    
Collectively evaluated for credit loss 16,734,000   16,734,000    
Acquired with deteriorated credit quality         0
Loans 16,734,000   16,734,000   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 3,087,000 589,000 906,000 671,000  
Charge-offs 0 0 0    
Recoveries 2,000 1,000 5,000 2,000  
Provision 287,000 101,000 455,000 18,000  
Ending balance 3,376,000 691,000 3,376,000 691,000  
Individually evaluated for credit loss   154,000   154,000 131,000
Collectively evaluated for credit loss   537,000   537,000 775,000
Individually evaluated for credit loss 36,000   36,000    
Collectively evaluated for credit loss 3,340,000   3,340,000    
Individually evaluated for impairment         2,474,000
Collectively evaluated for impairment         225,792,000
Individually evaluated for credit loss 1,756,000   1,756,000    
Collectively evaluated for credit loss 245,862,000   245,862,000    
Acquired with deteriorated credit quality         1,650,000
Loans 247,618,000   247,618,000   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]          
Provision 40,000   40,000    
Ending balance 40,000   40,000    
Collectively evaluated for credit loss 40,000   40,000    
Collectively evaluated for credit loss 38,838,000   38,838,000    
Loans 38,838,000   38,838,000    
Unallocated Financing Receivables [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 0 842,000 13,000 1,010,000  
Charge-offs 0   0    
Recoveries 0   0    
Provision 0 (440,000) 0 (608,000)  
Ending balance 0 402,000 0 402,000  
Individually evaluated for credit loss   0   0 0
Collectively evaluated for credit loss   $ 402,000   $ 402,000 $ 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)