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Loans and Allowance for Credit Losses - Additional Information (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Loan_modified
Alternative
Mar. 31, 2024
USD ($)
Loan_modified
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accrued interest on loans $ 31,700,000   $ 33,700,000  
Gross loans 5,695,214,000   5,665,848,000  
Allowance for credit losses $ 70,051,000 $ 67,936,000 70,182,000 $ 68,675,000
Number of alternatives for measuring impaired loans receivable | Alternative 3      
Interest lost on nonaccrual loans $ 471,000   267,000  
Troubled debt restructurings balance | Loan_modified 4 0    
Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for credit losses $ 250,000,000      
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      
Motels and Hotels Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 218,000,000      
Non-residential Buildings        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans 1,100,000,000      
Residential Buildings and Dwellings        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 589,800,000      
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 $ 670,100,000   630,600,000  
Increase in accounts and notes receivable $ 39,500,000      
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 $ 573,100,000   507,600,000  
Increase in accounts and notes receivable 65,500,000      
Agricultural | Real Estate Loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for credit losses $ 1,292,000 $ 1,358,000 1,361,000 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 $ 26,028,000 24,631,000 25,602,000 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 | Real Estate Loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for credit losses $ 3,731,000 $ 2,701,000 $ 3,275,000 $ 2,918,000