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Loans, Net and Allowance for Credit Losses on Loans - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans pledged $ 7,701,144,000   $ 7,701,144,000     $ 8,109,607,000    
Commercial Loans 14,138,644,000   14,138,644,000     14,558,681,000    
Allowance for credit losses 150,285,000 $ 148,249,000 150,285,000 $ 148,249,000 $ 145,323,000 151,861,000 $ 147,804,000 $ 148,787,000
Loans modified 0 0 0 0        
Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for credit losses 34,778,000 33,634,000 34,778,000 33,634,000 35,165,000 34,793,000 34,581,000 54,037,000
Agricultural                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for credit losses 532,000 818,000 532,000 818,000 556,000 745,000 830,000 207,000
Consumer                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for credit losses 465,000 $ 414,000 $ 465,000 $ 414,000 $ 436,000 379,000 $ 472,000 $ 502,000
Customer Concentration Risk | Consumer | Loans and Leases, Net                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of the portfolio     1.00%          
Geographic Concentration Risk | Loans and Leases, Net | North Texas                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of the portfolio     34.00%          
Geographic Concentration Risk | Loans and Leases, Net | Colorado                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of the portfolio     27.00%          
Geographic Concentration Risk | Loans and Leases, Net | Houston Texas                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of the portfolio     26.00%          
Geographic Concentration Risk | Loans and Leases, Net | Central Texas                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of the portfolio     13.00%          
Energy Related Loans | Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Commercial Loans 660,931,000   $ 660,931,000     $ 621,883,000    
Mortgage warehouse purchase loans | Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Duration of the loans to larger mortgage originators     60 days          
Allowance for credit losses $ 0   $ 0          
Mortgage warehouse purchase loans | Maximum | Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Duration of the loans to mortgage bankers     15 days          
Owner Occupied | Customer Concentration Risk | Loans and Leases, Net                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of the portfolio     21.00%          
Real Estate Loan | Agricultural                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loan to value ratio (percent) 80.00%   80.00%          
Loan, amortization period     20 years          
Non-Real Estate Loan | Agricultural                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Period of operating lines     1 year