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Loans and Allowance for Credit Losses - Risk Grade by Category of Loan and Year of Origination/Renewal (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable Impaired [Line Items]    
2025 $ 3,323,561  
2024 2,162,326  
2023 2,858,509  
2022 4,478,894  
2021 3,199,508  
Prior 4,270,307  
Revolving Loans 1,717,861  
Revolving Loans Converted to Term Loans 16,803  
Total loans 22,027,769 $ 22,149,209
Current-period gross write-offs, 2025 4,652  
Current-period gross write-offs, 2024 907  
Current-period gross write-offs, 2023 4,725  
Current-period gross write-offs, 2022 1,494  
Current-period gross write-offs, 2021 1,306  
Current-period gross write-offs, Prior 243  
Current-period gross write-offs, Revolving Loans 2,346  
Current-period gross write-offs, Total 15,678  
PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 50,808  
2024 59,304  
2023 24,688  
2022 80,765  
2021 49,688  
Prior 51,598  
Revolving Loans 28,249  
Revolving Loans Converted to Term Loans 72  
Total loans 345,172  
Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
Total loans 1,019,589 1,033,546
Warehouse Purchase Program [Member]    
Financing Receivable Impaired [Line Items]    
2025 1,278,178  
Total loans 1,278,178 1,080,903
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 667,184  
2024 588,785  
2023 536,480  
2022 586,977  
2021 224,578  
Prior 79,673  
Revolving Loans 172,629  
Revolving Loans Converted to Term Loans 8,974  
Total loans 2,865,280 2,859,281
Current-period gross write-offs, 2024 82  
Current-period gross write-offs, 2023 92  
Current-period gross write-offs, 2021 73  
Current-period gross write-offs, Total 247  
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 11,713  
2024 11,398  
2023 7,205  
2022 22,007  
2021 5,194  
Prior 3,115  
Revolving Loans 8,583  
Total loans 69,215  
Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2025 164,215  
2024 141,424  
2023 79,952  
2022 185,219  
2021 105,678  
Prior 128,813  
Revolving Loans 214,288  
Revolving Loans Converted to Term Loans 0  
Total loans 1,019,589  
Current-period gross write-offs, 2024 29  
Current-period gross write-offs, 2023 5  
Current-period gross write-offs, 2021 8  
Current-period gross write-offs, Prior 5  
Current-period gross write-offs, Total 47  
Real Estate [Member] | Agriculture [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 352  
2024 13,833  
2023 17  
2022 2,319  
2021 1,395  
Prior 5,066  
Revolving Loans 5,535  
Total loans 28,517  
Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2025 358,371  
2024 551,960  
2023 1,528,456  
2022 2,093,368  
2021 1,791,260  
Prior 1,882,454  
Revolving Loans 98,723  
Revolving Loans Converted to Term Loans 6,047  
Total loans [1] 8,310,639 8,487,589
Current-period gross write-offs, 2023 952  
Current-period gross write-offs, 2022 824  
Current-period gross write-offs, 2021 76  
Current-period gross write-offs, Prior 35  
Current-period gross write-offs, Revolving Loans 442  
Current-period gross write-offs, Total 2,329  
Real Estate [Member] | 1-4 Family [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 47  
2024 29  
2023 1,124  
2022 2,789  
2021 278  
Prior 1,823  
Total loans 6,090  
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2025 458,924  
2024 458,580  
2023 490,226  
2022 1,394,402  
2021 984,402  
Prior 1,923,714  
Revolving Loans 86,368  
Revolving Loans Converted to Term Loans 321  
Total loans 5,796,937 5,800,985
Current-period gross write-offs, 2024 74  
Current-period gross write-offs, 2023 342  
Current-period gross write-offs, 2022 194  
Current-period gross write-offs, 2021 941  
Current-period gross write-offs, Revolving Loans 50  
Current-period gross write-offs, Total 1,601  
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 24,926  
2024 32,882  
2023 15,675  
2022 48,861  
2021 42,060  
Prior 39,838  
Total loans 204,242  
Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 325,664  
2024 294,752  
2023 192,519  
2022 178,602  
2021 77,067  
Prior 227,641  
Revolving Loans 1,093,414  
Revolving Loans Converted to Term Loans 1,460  
Total loans 2,391,119 2,508,088
Current-period gross write-offs, 2024 664  
Current-period gross write-offs, 2023 3,253  
Current-period gross write-offs, 2022 422  
Current-period gross write-offs, 2021 202  
Current-period gross write-offs, Prior 85  
Current-period gross write-offs, Revolving Loans 1,756  
Current-period gross write-offs, Total 6,382  
Commercial and Industrial [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 13,770  
2024 1,162  
2023 667  
2022 4,789  
2021 752  
Prior 1,752  
Revolving Loans 14,129  
Revolving Loans Converted to Term Loans 72  
Total loans 37,093  
Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2025 71,025  
2024 126,825  
2023 30,876  
2022 40,326  
2021 16,523  
Prior 28,012  
Revolving Loans 52,439  
Revolving Loans Converted to Term Loans 1  
Total loans 366,027 $ 378,817
Current-period gross write-offs, 2025 4,652  
Current-period gross write-offs, 2024 58  
Current-period gross write-offs, 2023 81  
Current-period gross write-offs, 2022 54  
Current-period gross write-offs, Prior 118  
Current-period gross write-offs, Revolving Loans 98  
Current-period gross write-offs, Revolving Loans Converted to Term Loans 5  
Current-period gross write-offs, Total 5,072  
Consumer and Other [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2021 9  
Prior 4  
Revolving Loans 2  
Total loans 15  
Grade 1 [Member]    
Financing Receivable Impaired [Line Items]    
2025 55,873  
2024 27,653  
2023 6,572  
2022 1,973  
2021 2,726  
Prior 941  
Revolving Loans 55,846  
Revolving Loans Converted to Term Loans 0  
Total loans 151,584  
Grade 1 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 0  
Total loans 0  
Grade 1 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2025 3,398  
2024 537  
2023 232  
2022 6  
2021 2  
Prior 0  
Revolving Loans 9,439  
Total loans 13,614  
Grade 1 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2023 69  
2022 135  
Prior 106  
Total loans 310  
Grade 1 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 30,044  
2024 18,740  
2023 3,319  
2022 884  
2021 1,933  
Prior 660  
Revolving Loans 44,881  
Total loans 100,461  
Grade 1 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2025 22,431  
2024 8,376  
2023 2,952  
2022 948  
2021 791  
Prior 175  
Revolving Loans 1,526  
Total loans 37,199  
Grade 2 [Member]    
Financing Receivable Impaired [Line Items]    
2025 10,764  
2024 100,817  
2023 11,885  
2022 21,040  
2021 137  
Prior 6,293  
Revolving Loans 21,728  
Total loans 172,664  
Grade 2 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2023 488  
2022 0  
Prior 12  
Total loans 500  
Grade 2 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2023 6  
2022 45  
Prior 536  
Total loans 587  
Grade 2 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2023 501  
2022 315  
2021 137  
Prior 1,875  
Total loans 2,828  
Grade 2 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2025 385  
2022 460  
Prior 614  
Revolving Loans 6,075  
Total loans 7,534  
Grade 2 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 278  
2024 1,100  
2023 483  
2022 6,513  
Prior 1,537  
Revolving Loans 10,423  
Total loans 20,334  
Grade 2 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2025 10,101  
2024 99,717  
2023 10,407  
2022 13,707  
Prior 1,719  
Revolving Loans 5,230  
Revolving Loans Converted to Term Loans  
Total loans 140,881  
Grade 3 [Member]    
Financing Receivable Impaired [Line Items]    
2025 2,917,412  
2024 1,668,708  
2023 2,407,874  
2022 3,443,867  
2021 2,733,086  
Prior 3,192,728  
Revolving Loans 1,347,215  
Revolving Loans Converted to Term Loans 15,549  
Total loans 17,726,439  
Grade 3 [Member] | Warehouse Purchase Program [Member]    
Financing Receivable Impaired [Line Items]    
2025 1,278,178  
Total loans 1,278,178  
Grade 3 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 589,779  
2024 459,421  
2023 298,232  
2022 312,702  
2021 149,865  
Prior 53,801  
Revolving Loans 116,613  
Revolving Loans Converted to Term Loans 8,974  
Total loans 1,989,387  
Grade 3 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2025 112,360  
2024 93,723  
2023 65,661  
2022 154,868  
2021 77,795  
Prior 106,524  
Revolving Loans 158,894  
Total loans 769,825  
Grade 3 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2025 343,512  
2024 536,660  
2023 1,501,860  
2022 2,049,649  
2021 1,753,079  
Prior 1,792,583  
Revolving Loans 93,287  
Revolving Loans Converted to Term Loans 5,611  
Total loans 8,076,241  
Grade 3 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2025 302,100  
2024 318,680  
2023 372,272  
2022 779,374  
2021 669,278  
Prior 1,028,034  
Revolving Loans 65,940  
Revolving Loans Converted to Term Loans 321  
Total loans 3,535,999  
Grade 3 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 253,094  
2024 242,026  
2023 153,490  
2022 121,642  
2021 68,176  
Prior 201,749  
Revolving Loans 876,103  
Revolving Loans Converted to Term Loans 642  
Total loans 1,916,922  
Grade 3 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2025 38,389  
2024 18,198  
2023 16,359  
2022 25,632  
2021 14,893  
Prior 10,037  
Revolving Loans 36,378  
Revolving Loans Converted to Term Loans 1  
Total loans 159,887  
Grade 4 [Member]    
Financing Receivable Impaired [Line Items]    
2025 269,810  
2024 235,734  
2023 384,181  
2022 862,635  
2021 384,345  
Prior 728,922  
Revolving Loans 187,107  
Revolving Loans Converted to Term Loans 1,087  
Total loans 3,053,821  
Grade 4 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 58,453  
2024 117,445  
2023 230,542  
2022 252,189  
2021 69,034  
Prior 17,181  
Revolving Loans 46,564  
Total loans 791,408  
Grade 4 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2025 46,947  
2024 30,227  
2023 13,992  
2022 26,236  
2021 25,918  
Prior 14,788  
Revolving Loans 40,170  
Total loans 198,278  
Grade 4 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2025 14,681  
2024 10,799  
2023 17,914  
2022 20,904  
2021 26,707  
Prior 63,043  
Revolving Loans 5,360  
Total loans 159,749  
Grade 4 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2025 123,320  
2024 51,041  
2023 96,359  
2022 539,158  
2021 256,554  
Prior 598,462  
Revolving Loans 11,010  
Total loans 1,675,904  
Grade 4 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 26,305  
2024 25,688  
2023 25,340  
2022 24,109  
2021 5,302  
Prior 19,371  
Revolving Loans 75,851  
Revolving Loans Converted to Term Loans 746  
Total loans 202,712  
Grade 4 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2025 104  
2024 534  
2023 34  
2022 39  
2021 830  
Prior 16,077  
Revolving Loans 8,152  
Total loans 25,770  
Grade 5 [Member]    
Financing Receivable Impaired [Line Items]    
2025 5,039  
2024 33,282  
2023 3,492  
2022 28,551  
2021 18,051  
Prior 189,884  
Revolving Loans 16,166  
Total loans 294,465  
Grade 5 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 129  
2024 0  
2023 13  
2021 342  
Prior 5,105  
Revolving Loans 869  
Total loans 6,458  
Grade 5 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2025 1,158  
2024 1,700  
2023 44  
2022 232  
2021 568  
Prior 1,314  
Total loans 5,016  
Grade 5 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2025 131  
2024 3,520  
2023 1,191  
2022 2,209  
2021 2,545  
Prior 1,767  
Revolving Loans 76  
Total loans 11,439  
Grade 5 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2025 3,488  
2024 26,989  
2023 1,007  
2022 8,651  
2021 14,172  
Prior 181,698  
Revolving Loans 3,343  
Total loans 239,348  
Grade 5 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 133  
2024 1,073  
2023 140  
2022 17,459  
2021 424  
Prior 0  
Revolving Loans 11,716  
Total loans 30,945  
Grade 5 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2023 1,097  
Revolving Loans 162  
Total loans 1,259  
Grade 6 [Member]    
Financing Receivable Impaired [Line Items]    
2025 13,760  
2024 30,333  
2023 10,736  
2022 20,129  
2021 2,400  
Prior 77,701  
Revolving Loans 39,483  
Revolving Loans Converted to Term Loans 0  
Total loans 194,542  
Grade 6 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 7,110  
2024 521  
2021 143  
Prior 451  
Total loans 8,225  
Grade 6 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 6  
Prior 157  
Total loans 163  
Grade 6 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2024 558  
2023 478  
2022 492  
2021 198  
Prior 2,613  
Total loans 4,339  
Grade 6 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2025 4,705  
2024 27,965  
2023 4,913  
2022 16,648  
2021 1,639  
Prior 74,275  
Total loans 130,145  
Grade 6 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 1,945  
2024 1,283  
2023 5,345  
2022 2,989  
2021 420  
Prior 205  
Revolving Loans 39,483  
Total loans 51,670  
Grade 7 [Member]    
Financing Receivable Impaired [Line Items]    
2025 95  
2024 6,495  
2023 9,081  
2022 19,934  
2021 9,075  
Prior 22,240  
Revolving Loans 22,067  
Total loans 89,082  
Grade 7 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2022 79  
Prior 8  
Total loans 87  
Grade 7 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,398  
2022 1,513  
Prior 428  
Revolving Loans 250  
Total loans 3,589  
Grade 7 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2024 394  
2023 5,319  
2022 16,875  
2021 8,316  
Prior 18,644  
Revolving Loans 0  
Total loans 49,643  
Grade 7 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,023  
2022 1,250  
2021 699  
Prior 793  
Total loans 3,765  
Grade 7 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 95  
2024 3,680  
2023 3,735  
2022 217  
2021 60  
Prior 2,367  
Revolving Loans 20,828  
Total loans 30,982  
Grade 7 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2023 27  
Revolving Loans 989  
Total loans $ 1,016  
[1] Includes $11.3 million and $10.7 million of residential mortgage loans held for sale at September 30, 2025, and December 31, 2024, respectively.