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Loans and Allowance for Credit Losses - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Loan_modified
Sep. 30, 2024
USD ($)
Loan_modified
Sep. 30, 2025
USD ($)
Alternative
Sep. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accrued interest on loans $ 35,500,000   $ 35,500,000     $ 33,700,000    
Gross loans 5,818,495,000   5,818,495,000     5,665,848,000    
Allowance for credit losses $ 72,925,000 $ 68,774,000 $ 72,925,000 $ 68,774,000 $ 71,160,000 70,182,000 $ 68,312,000 $ 68,675,000
Number of alternatives for measuring impaired loans receivable | Alternative     3          
Interest lost on nonaccrual loans     $ 981,000 516,000        
Troubled debt restructurings balance | Loan_modified 1 0            
Minimum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for credit losses $ 250,000,000   $ 250,000,000          
Commercial Real Estate                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Thresholds percentage of total capital     300.00%          
Commercial Real Estate | Minimum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Maximum loan-to-value ratio (in hundredths)     65.00%          
Debt coverage ratio     1.20x          
Amortization period of loans     twenty years          
Commercial Real Estate | Maximum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Maximum loan-to-value ratio (in hundredths)     85.00%          
Debt coverage ratio     1.35x          
Amortization period of loans     thirty years          
1-4 Family Residential Properties                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Period when loans charged-down 180 days   180 days          
Motels and Hotels Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Gross loans $ 222,400,000   $ 222,400,000          
Non-residential Buildings                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Gross loans 1,000,000,000   1,000,000,000          
Residential Buildings and Dwellings                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Gross loans $ 604,800,000   $ 604,800,000          
Unsecured Open-end Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Period when loans charged-down 180 days   180 days          
Other Secured Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Period when loans charged-down 120 days   120 days          
Agricultural                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Gross loans $ 678,700,000   $ 678,700,000     630,600,000    
Increase in accounts and notes receivable     $ 48,100,000          
Maximum loan-to-value ratio (in hundredths)     80.00%          
Loans receivable, time period     1 year          
Agricultural | Minimum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Amortization period of loans     twenty-five          
Agricultural | Maximum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Amortization period of loans     thirty years          
Agricultural | Corn and Other Grain Farming                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Gross loans 579,600,000   $ 579,600,000     507,600,000    
Increase in accounts and notes receivable     72,000,000          
Agricultural | Real Estate Loan                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for credit losses 1,265,000 $ 1,342,000 $ 1,265,000 1,342,000 1,322,000 1,361,000 1,372,000 1,366,000
Commercial and Industrial Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Maximum loan-to-value ratio (in hundredths)     80.00%          
Amortization period of loans     seven years          
Loans receivable, time period     1 year          
Allowance for credit losses 25,964,000 25,569,000 $ 25,964,000 25,569,000 25,618,000 25,602,000 24,931,000 25,450,000
Residential Properties | Real Estate Loan                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Maximum loan-to-value ratio (in hundredths)     80.00%          
Amortization period of loans     twenty-five years          
Construction and Land Development                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Thresholds percentage of total capital     100.00%          
Construction and Land Development | Real Estate Loan                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for credit losses 4,686,000 $ 2,674,000 $ 4,686,000 $ 2,674,000 $ 4,066,000 $ 3,275,000 $ 2,646,000 $ 2,918,000
Construction and Land Development | Real Estate Loan | Minimum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Gross loans $ 2,000,000   $ 2,000,000          
Maximum loan-to-value ratio (in hundredths)     65.00%          
Amortization period of loans     twenty          
Construction and Land Development | Real Estate Loan | Maximum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Maximum loan-to-value ratio (in hundredths)     80.00%          
Amortization period of loans     thirty years