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Loans and Allowance for Credit Losses - Aging Analysis of Past Due Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing $ 22,149,654 $ 21,002,310
Nonaccrual loans 84,175 68,688
Total loans 22,320,815 21,180,538
Financing Receivables, 30 to 89 Days Past Due [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 86,664 107,345
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 322 2,195
Financing Receivables Past Due Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 86,986 109,540
Warehouse Purchase Program Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 1,081,403 822,245
Total loans 1,081,403 822,245
Agriculture [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 1,029,338 806,011
Nonaccrual loans 2,550 1,460
Total loans 1,037,361 816,043
Agriculture [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 5,473 8,572
Agriculture [Member] | Financing Receivables Past Due Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 5,473 8,572
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 2,809,085 3,038,559
Nonaccrual loans 2,504 14,770
Total loans 2,828,372 3,076,591
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 16,728 21,627
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 55 1,635
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables Past Due Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 16,783 23,262
Real Estate [Member] | Agriculture [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 1,037,361  
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing [1] 8,354,166 8,103,904
Nonaccrual loans [1] 32,408 25,694
Total loans [1] 8,426,913 8,168,078
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing [1] 40,339 38,350
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing [1]   130
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables Past Due Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing [1] 40,339 38,480
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 5,922,237 5,620,775
Nonaccrual loans 31,064 18,662
Total loans 5,961,884 5,662,948
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 8,583 23,511
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | Financing Receivables Past Due Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 8,583 23,511
Commercial and Industrial [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 2,614,137 2,281,762
Nonaccrual loans 15,575 8,066
Total loans 2,644,271 2,305,040
Commercial and Industrial [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 14,459 14,782
Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 100 430
Commercial and Industrial [Member] | Financing Receivables Past Due Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 14,559 15,212
Consumer and Other [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 339,288 329,054
Nonaccrual loans 74 36
Total loans 340,611 329,593
Consumer and Other [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 1,082 503
Consumer and Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing 167  
Consumer and Other [Member] | Financing Receivables Past Due Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans past due and still accruing $ 1,249 $ 503
[1] Includes $10.0 million and $5.7 million of residential mortgage loans held for sale at June 30, 2024 and December 31, 2023, respectively.