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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance $ 16,152,000 $ 14,582,000 $ 15,685,000 $ 7,619,000  
Charge-offs (189,000) (261,000) (640,000) (532,000)  
Recoveries 102,000 113,000 345,000 288,000  
Provision 425,000 438,000 1,100,000 332,000  
Ending balance 16,490,000 14,872,000 16,490,000 14,872,000  
Individually evaluated for credit loss   484,000   484,000 $ 60,000
Collectively evaluated for credit loss   14,388,000   14,388,000 15,625,000
Individually evaluated for credit loss 88,000   88,000    
Collectively evaluated for credit loss 16,402,000   16,402,000    
Individually evaluated for impairment         2,079,000
Collectively evaluated for impairment         1,408,574,000
Individually evaluated for credit loss 2,735,000   2,735,000    
Collectively evaluated for credit loss 1,501,215,000   1,501,215,000    
Acquired with deteriorated credit quality         0
Total loans held for investment (Note 3) 1,503,950,000   1,503,950,000   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 112,000 78,000 94,000 144,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (2,000) 5,000 16,000 (75,000)  
Ending balance 110,000 83,000 110,000 83,000  
Individually evaluated for credit loss   3,000   3,000 2,000
Collectively evaluated for credit loss   80,000   80,000 92,000
Individually evaluated for credit loss 1,000   1,000    
Collectively evaluated for credit loss 109,000   109,000    
Individually evaluated for impairment         54,000
Collectively evaluated for impairment         49,156,000
Individually evaluated for credit loss 13,000   13,000    
Collectively evaluated for credit loss 49,134,000   49,134,000    
Acquired with deteriorated credit quality         0
Total loans held for investment (Note 3) 49,147,000   49,147,000   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 2,161,000 2,896,000 2,216,000 1,361,000  
Charge-offs 0 (73,000) (1,000) (73,000)  
Recoveries 2,000 28,000 13,000 57,000  
Provision 307,000 (328,000) 242,000 (409,000)  
Ending balance 2,470,000 2,523,000 2,470,000 2,523,000  
Individually evaluated for credit loss   89,000   89,000 6,000
Collectively evaluated for credit loss   2,434,000   2,434,000 2,210,000
Individually evaluated for credit loss 7,000   7,000    
Collectively evaluated for credit loss 2,463,000   2,463,000    
Individually evaluated for impairment         136,000
Collectively evaluated for impairment         229,779,000
Individually evaluated for credit loss 174,000   174,000    
Collectively evaluated for credit loss 229,058,000   229,058,000    
Acquired with deteriorated credit quality         0
Total loans held for investment (Note 3) 229,232,000   229,232,000   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 795,000 885,000 823,000 310,000  
Charge-offs (166,000) (161,000) (616,000) (432,000)  
Recoveries 96,000 80,000 321,000 208,000  
Provision 36,000 22,000 233,000 199,000  
Ending balance 761,000 826,000 761,000 826,000  
Individually evaluated for credit loss   0   0 0
Collectively evaluated for credit loss   826,000   826,000 823,000
Individually evaluated for credit loss 1,000   1,000    
Collectively evaluated for credit loss 760,000   760,000    
Individually evaluated for impairment         2,000
Collectively evaluated for impairment         36,539,000
Individually evaluated for credit loss 26,000   26,000    
Collectively evaluated for credit loss 30,667,000   30,667,000    
Acquired with deteriorated credit quality         0
Total loans held for investment (Note 3) 30,693,000   30,693,000   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 9,360,000 7,237,000 8,820,000 4,822,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 13,000  
Provision (140,000) 908,000 400,000 304,000  
Ending balance 9,220,000 8,145,000 9,220,000 8,145,000  
Individually evaluated for credit loss   347,000   347,000 1,000
Collectively evaluated for credit loss   7,798,000   7,798,000 8,819,000
Individually evaluated for credit loss 1,000   1,000    
Collectively evaluated for credit loss 9,219,000   9,219,000    
Individually evaluated for impairment         29,000
Collectively evaluated for impairment         786,892,000
Individually evaluated for credit loss 27,000   27,000    
Collectively evaluated for credit loss 862,746,000   862,746,000    
Acquired with deteriorated credit quality         0
Total loans held for investment (Note 3) 862,773,000   862,773,000   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 49,000 70,000 58,000 63,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (13,000) (19,000) (22,000) (32,000)  
Ending balance 36,000 51,000 36,000 51,000  
Individually evaluated for credit loss         0
Collectively evaluated for credit loss   51,000   51,000 58,000
Individually evaluated for credit loss 0   0    
Collectively evaluated for credit loss 36,000   36,000    
Individually evaluated for impairment         0
Collectively evaluated for impairment         20,936,000
Individually evaluated for credit loss 229,000   229,000    
Collectively evaluated for credit loss 14,326,000   14,326,000    
Acquired with deteriorated credit quality         0
Total loans held for investment (Note 3) 14,555,000   14,555,000   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 3,625,000 3,376,000 3,644,000 906,000  
Charge-offs (23,000) (27,000) (23,000) (27,000)  
Recoveries 4,000 5,000 11,000 10,000  
Provision 227,000 (150,000) 201,000 305,000  
Ending balance 3,833,000 3,204,000 3,833,000 3,204,000  
Individually evaluated for credit loss   45,000   45,000 51,000
Collectively evaluated for credit loss   3,159,000   3,159,000 3,593,000
Individually evaluated for credit loss 78,000   78,000    
Collectively evaluated for credit loss 3,755,000   3,755,000    
Individually evaluated for impairment         1,858,000
Collectively evaluated for impairment         265,872,000
Individually evaluated for credit loss 2,266,000   2,266,000    
Collectively evaluated for credit loss 276,792,000   276,792,000    
Acquired with deteriorated credit quality         0
Total loans held for investment (Note 3) 279,058,000   279,058,000   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 50,000 40,000 30,000 0  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 10,000 0 30,000 40,000  
Ending balance 60,000 40,000 60,000 40,000  
Individually evaluated for credit loss   0   0 0
Collectively evaluated for credit loss   40,000   40,000 30,000
Individually evaluated for credit loss 0   0    
Collectively evaluated for credit loss 60,000   60,000    
Individually evaluated for impairment         0
Collectively evaluated for impairment         19,400,000
Individually evaluated for credit loss 0   0    
Collectively evaluated for credit loss 38,492,000   38,492,000    
Acquired with deteriorated credit quality         0
Total loans held for investment (Note 3) $ 38,492,000   $ 38,492,000   $ 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  
Unallocated Financing Receivables [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance   0   13,000  
Charge-offs   0   0  
Recoveries   0   0  
Provision   0   0  
Ending balance   0   0  
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)