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Loans and Allowance for Credit Losses - Additional Information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Loan_modified
Jun. 30, 2025
USD ($)
Alternative
Dec. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Accrued interest on loans $ 33,000,000 $ 33,000,000 $ 33,700,000        
Gross loans 5,759,640,000 5,759,640,000 5,665,848,000        
Allowance for credit losses $ 71,160,000 $ 71,160,000 70,182,000 $ 70,051,000 $ 68,312,000 $ 67,936,000 $ 68,675,000
Number of alternatives for measuring impaired loans receivable | Alternative   3          
Interest lost on nonaccrual loans   $ 662,000 487,000        
Troubled debt restructurings balance | Loan_modified 0            
Minimum              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for credit losses $ 250,000,000 $ 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 180 days          
Motels and Hotels Loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Gross loans $ 221,500,000 $ 221,500,000          
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 $ 616,200,000 $ 616,200,000          
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 $ 687,800,000 $ 687,800,000 630,600,000        
Increase in accounts and notes receivable   $ 57,200,000          
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 584,500,000 $ 584,500,000 507,600,000        
Increase in accounts and notes receivable   76,900,000          
Agricultural | Real Estate Loan              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for credit losses 1,322,000 $ 1,322,000 1,361,000 1,292,000 1,372,000 1,358,000 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 25,618,000 $ 25,618,000 25,602,000 26,028,000 24,931,000 24,631,000 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 4,066,000 $ 4,066,000 $ 3,275,000 $ 3,731,000 $ 2,646,000 $ 2,701,000 $ 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