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Loans and Allowance for Credit Losses - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Loan_modified
Jun. 30, 2024
USD ($)
Loan_modified
Alternative
Jun. 30, 2023
USD ($)
Loan_modified
Dec. 31, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accrued interest on loans   $ 32,300,000   $ 29,900,000
Gross loans   5,552,853,000   5,575,585,000
Minimum value of loans individually measured for impairment   $ 250,000,000    
Number of alternatives for measuring impaired loans receivable | Alternative   3    
Interest lost on nonaccrual loans   $ 487,000 $ 122,000  
Troubled debt restructurings balance | Loan_modified 0 0 0  
Commercial Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Debt coverage ratio   1.20x    
Commercial Real Estate | Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Maximum loan-to-value ratio (in hundredths)   65.00%    
Amortization period of loans   twenty    
Commercial Real Estate | Maximum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Maximum loan-to-value ratio (in hundredths)   80.00%    
Amortization period of loans   twenty five years    
1-4 Family Residential Properties        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Period when loans charged-down   180 days    
Motels and Hotels Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans   $ 223,100,000    
Non-residential Buildings        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans   1,070,000,000.00    
Residential Buildings and Dwellings        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans   $ 562,300,000    
Unsecured Open-end Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Period when loans charged-down   180 days    
Other Secured Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Period when loans charged-down   120 days    
Agricultural        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans   $ 601,600,000   588,500,000
Increase in accounts and notes receivable   $ 13,200,000    
Maximum loan-to-value ratio (in hundredths)   65.00%    
Amortization period of loans   twenty-five years    
Loans receivable, time period   1 year    
Agricultural | Corn and Other Grain Farming        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans   $ 490,200,000   $ 472,500,000
Increase in accounts and notes receivable   $ 17,800,000    
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    
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