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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, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Beginning balance $ 16,037,000 $ 15,065,000 $ 7,619,000 $ 15,685,000 $ 7,619,000  
Charge-offs (328,000)   (131,000) (452,000) (271,000)  
Recoveries 171,000   63,000 244,000 176,000  
Provision 272,000 (415,000)   675,000 (106,000)  
Ending balance 16,152,000 14,582,000 15,065,000 16,152,000 14,582,000  
Individually evaluated for impairment   72,000     72,000 $ 60,000
Collectively evaluated for impairment   14,510,000     14,510,000 15,625,000
Individually evaluated for credit loss 87,000     87,000    
Collectively evaluated for credit loss 16,065,000     16,065,000   1,410,653,000
Individually evaluated for impairment           2,079,000
Collectively evaluated for impairment           1,408,574,000
Individually evaluated for credit loss 2,492,000     2,492,000    
Collectively evaluated for credit loss 1,435,035,000     1,435,035,000    
Acquired with deteriorated credit quality           0
Loans 1,437,527,000     1,437,527,000   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   7,165,000  
Agricultural [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Beginning balance 97,000 136,000 144,000 94,000 144,000  
Charge-offs 0   0 0 0  
Recoveries 0   0 0 0  
Provision 15,000 (58,000)   18,000 (80,000)  
Ending balance 112,000 78,000 136,000 112,000 78,000  
Individually evaluated for impairment   1,000     1,000 2,000
Collectively evaluated for impairment   77,000     77,000 92,000
Individually evaluated for credit loss 1,000     1,000    
Collectively evaluated for credit loss 111,000     111,000   49,210,000
Individually evaluated for impairment           54,000
Collectively evaluated for impairment           49,156,000
Individually evaluated for credit loss 27,000     27,000    
Collectively evaluated for credit loss 45,247,000     45,247,000    
Acquired with deteriorated credit quality           0
Loans 45,274,000     45,274,000   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   14,000  
Commercial and Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Beginning balance 2,243,000 3,020,000 1,361,000 2,216,000 1,361,000  
Charge-offs 0   0 (1,000) 0  
Recoveries 2,000   2,000 11,000 29,000  
Provision (84,000) (126,000)   (65,000) (81,000)  
Ending balance 2,161,000 2,896,000 3,020,000 2,161,000 2,896,000  
Individually evaluated for impairment   34,000     34,000 6,000
Collectively evaluated for impairment   2,862,000     2,862,000 2,210,000
Individually evaluated for credit loss 7,000     7,000    
Collectively evaluated for credit loss 2,154,000     2,154,000   229,915,000
Individually evaluated for impairment           136,000
Collectively evaluated for impairment           229,779,000
Individually evaluated for credit loss 151,000     151,000    
Collectively evaluated for credit loss 223,880,000     223,880,000    
Acquired with deteriorated credit quality           0
Loans 224,031,000     224,031,000   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   1,587,000  
Consumer Portfolio Segment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Beginning balance 918,000 913,000 310,000 823,000 310,000  
Charge-offs (328,000)   (131,000) (451,000) (271,000)  
Recoveries 166,000   59,000 226,000 129,000  
Provision 39,000 44,000   197,000 176,000  
Ending balance 795,000 885,000 913,000 795,000 885,000  
Individually evaluated for impairment   0     0 0
Collectively evaluated for impairment   885,000     885,000 823,000
Individually evaluated for credit loss 0     0    
Collectively evaluated for credit loss 795,000     795,000   36,541,000
Individually evaluated for impairment           2,000
Collectively evaluated for impairment           36,539,000
Individually evaluated for credit loss 4,000     4,000    
Collectively evaluated for credit loss 32,807,000     32,807,000    
Acquired with deteriorated credit quality           0
Loans 32,811,000     32,811,000   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   541,000  
Commercial Real Estate Portfolio Segment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Beginning balance 9,167,000 7,837,000 4,822,000 8,820,000 4,822,000  
Charge-offs 0   0 0 0  
Recoveries 0   0 0 13,000  
Provision 194,000 (600,000)   541,000 (604,000)  
Ending balance 9,361,000 7,237,000 7,837,000 9,361,000 7,237,000  
Individually evaluated for impairment   1,000     1,000 1,000
Collectively evaluated for impairment   7,236,000     7,236,000 8,819,000
Individually evaluated for credit loss 1,000     1,000    
Collectively evaluated for credit loss 9,360,000     9,360,000   786,921,000
Individually evaluated for impairment           29,000
Collectively evaluated for impairment           786,892,000
Individually evaluated for credit loss 383,000     383,000    
Collectively evaluated for credit loss 803,830,000     803,830,000    
Acquired with deteriorated credit quality           0
Loans 804,213,000     804,213,000   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   3,006,000  
Construction Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Beginning balance 49,000 72,000 63,000 58,000 63,000  
Charge-offs 0   0 0 0  
Recoveries 0   0 0 0  
Provision 0 (2,000)   (9,000) (13,000)  
Ending balance 49,000 70,000 72,000 49,000 70,000  
Individually evaluated for impairment   0     0 0
Collectively evaluated for impairment   70,000     70,000 58,000
Individually evaluated for credit loss 0     0    
Collectively evaluated for credit loss 49,000     49,000   20,936,000
Individually evaluated for impairment           0
Collectively evaluated for impairment           20,936,000
Individually evaluated for credit loss 0     0    
Collectively evaluated for credit loss 18,751,000     18,751,000    
Acquired with deteriorated credit quality           0
Loans 18,751,000     18,751,000   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   20,000  
Residential Portfolio Segment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Beginning balance 3,513,000 3,087,000 906,000 3,644,000 906,000  
Charge-offs 0   0 0 0  
Recoveries 3,000   2,000 7,000 5,000  
Provision 108,000 287,000   (27,000) 455,000  
Ending balance 3,624,000 3,376,000 3,087,000 3,624,000 3,376,000  
Individually evaluated for impairment   36,000     36,000 51,000
Collectively evaluated for impairment   3,340,000     3,340,000 3,593,000
Individually evaluated for credit loss 78,000     78,000    
Collectively evaluated for credit loss 3,546,000     3,546,000   267,730,000
Individually evaluated for impairment           1,858,000
Collectively evaluated for impairment           265,872,000
Individually evaluated for credit loss 1,927,000     1,927,000    
Collectively evaluated for credit loss 273,951,000     273,951,000    
Acquired with deteriorated credit quality           0
Loans 275,878,000     275,878,000   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   2,010,000  
Loans To Other Financial Institutions [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Beginning balance 50,000 0 0 30,000 0  
Charge-offs 0   0 0 0  
Recoveries 0   0 0 0  
Provision 0 40,000   20,000 40,000  
Ending balance 50,000 40,000 0 50,000 40,000  
Individually evaluated for impairment   0     0 0
Collectively evaluated for impairment   40,000     40,000 30,000
Individually evaluated for credit loss 0     0    
Collectively evaluated for credit loss 50,000     50,000   19,400,000
Individually evaluated for impairment           0
Collectively evaluated for impairment           19,400,000
Individually evaluated for credit loss 0     0    
Collectively evaluated for credit loss 36,569,000     36,569,000    
Loans $ 36,569,000     $ 36,569,000   $ 19,400,000
Loans To Other Financial Institutions [Member] | Cumulative Effect of Change in Accounting Principle [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Beginning balance     0   0  
Unallocated Financing Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Beginning balance   0 13,000   13,000  
Charge-offs     0   0  
Recoveries     0   0  
Provision   0     0  
Ending balance   0 0   0  
Individually evaluated for impairment   0     0  
Collectively evaluated for impairment   $ 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)   $ (13,000)