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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
Mar. 31, 2025
Dec. 31, 2024
Financing Receivable Impaired [Line Items]    
2025 $ 1,669,507  
2024 2,520,820  
2023 3,052,674  
2022 4,786,935  
2021 3,463,796  
Prior 4,780,874  
Revolving Loans 1,641,307  
Revolving Loans Converted to Term Loans 61,657  
Total loans 21,977,570 $ 22,149,209
Current-period gross write-offs, 2025 1,174  
Current-period gross write-offs, 2024 37  
Current-period gross write-offs, 2023 647  
Current-period gross write-offs, 2022 577  
Current-period gross write-offs, 2021 113  
Current-period gross write-offs, Prior 325  
Current-period gross write-offs, Revolving Loans 1,065  
Current-period gross write-offs, Revolving Loans Converted to Term Loans 5  
Current-period gross write-offs, Total 3,943  
PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 36,259  
2024 76,916  
2023 32,152  
2022 124,099  
2021 50,993  
Prior 58,148  
Revolving Loans 42,763  
Total loans 421,330  
Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
Total loans 1,013,960 1,033,546
Warehouse Purchase Program [Member]    
Financing Receivable Impaired [Line Items]    
2025 1,057,893  
Total loans 1,057,893 1,080,903
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 164,717  
2024 799,536  
2023 590,741  
2022 702,912  
2021 269,466  
Prior 152,037  
Revolving Loans 146,955  
Revolving Loans Converted to Term Loans 18,718  
Total loans 2,845,082 2,859,281
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 2,477  
2024 20,944  
2023 13,443  
2022 36,999  
2021 5,858  
Prior 3,431  
Revolving Loans 20,287  
Total loans 103,439  
Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2025 71,361  
2024 172,724  
2023 90,597  
2022 216,152  
2021 112,577  
Prior 151,733  
Revolving Loans 198,431  
Revolving Loans Converted to Term Loans 385  
Total loans 1,013,960  
Real Estate [Member] | Agriculture [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 524  
2024 16,751  
2023 20  
2022 16,612  
2021 1,445  
Prior 5,437  
Revolving Loans 5,594  
Total loans 46,383  
Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2025 105,499  
2024 537,796  
2023 1,571,596  
2022 2,218,486  
2021 1,888,775  
Prior 2,038,693  
Revolving Loans 107,593  
Revolving Loans Converted to Term Loans 4,441  
Total loans [1] 8,472,879 8,487,589
Current-period gross write-offs, 2023 239  
Current-period gross write-offs, 2022 329  
Current-period gross write-offs, 2021 30  
Current-period gross write-offs, Prior 17  
Current-period gross write-offs, Revolving Loans 442  
Current-period gross write-offs, Total 1,057  
Real Estate [Member] | 1-4 Family [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 48  
2024 33  
2023 1,663  
2022 3,118  
2021 281  
Prior 1,927  
Total loans 7,070  
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2025 137,754  
2024 460,669  
2023 523,766  
2022 1,378,395  
2021 1,055,918  
Prior 2,152,909  
Revolving Loans 71,644  
Revolving Loans Converted to Term Loans 2,355  
Total loans 5,783,410 5,800,985
Current-period gross write-offs, 2023 304  
Current-period gross write-offs, 2022 33  
Current-period gross write-offs, Revolving Loans 50  
Current-period gross write-offs, Total 387  
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 33,121  
2024 36,932  
2023 16,224  
2022 58,080  
2021 42,515  
Prior 45,365  
Total loans 232,237  
Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 96,459  
2024 395,412  
2023 236,603  
2022 225,346  
2021 117,683  
Prior 253,897  
Revolving Loans 1,064,367  
Revolving Loans Converted to Term Loans 35,758  
Total loans 2,425,525 2,508,088
Current-period gross write-offs, 2023 50  
Current-period gross write-offs, 2022 198  
Current-period gross write-offs, 2021 83  
Current-period gross write-offs, Prior 66  
Current-period gross write-offs, Revolving Loans 545  
Current-period gross write-offs, Total 942  
Commercial and Industrial [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 89  
2024 2,256  
2023 802  
2022 9,290  
2021 877  
Prior 1,982  
Revolving Loans 16,880  
Total loans 32,176  
Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2025 35,824  
2024 154,683  
2023 39,371  
2022 45,644  
2021 19,377  
Prior 31,605  
Revolving Loans 52,317  
Total loans 378,821 $ 378,817
Current-period gross write-offs, 2025 1,174  
Current-period gross write-offs, 2024 37  
Current-period gross write-offs, 2023 54  
Current-period gross write-offs, 2022 17  
Current-period gross write-offs, Prior 242  
Current-period gross write-offs, Revolving Loans 28  
Current-period gross write-offs, Revolving Loans Converted to Term Loans 5  
Current-period gross write-offs, Total 1,557  
Consumer and Other [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2021 17  
Prior 6  
Revolving Loans 2  
Total loans 25  
Grade 1 [Member]    
Financing Receivable Impaired [Line Items]    
2025 20,961  
2024 55,938  
2023 10,438  
2022 3,540  
2021 3,470  
Prior 1,178  
Revolving Loans 63,011  
Revolving Loans Converted to Term Loans 227  
Total loans 158,763  
Grade 1 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2025 1,721  
2024 2,192  
2023 355  
2022 31  
2021 10  
Prior 3  
Revolving Loans 9,069  
Revolving Loans Converted to Term Loans 192  
Total loans 13,573  
Grade 1 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2025 85  
2023 71  
2022 141  
Prior 107  
Total loans 404  
Grade 1 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 10,679  
2024 34,427  
2023 5,381  
2022 1,533  
2021 2,487  
Prior 744  
Revolving Loans 51,928  
Revolving Loans Converted to Term Loans 35  
Total loans 107,214  
Grade 1 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2025 8,476  
2024 19,319  
2023 4,631  
2022 1,835  
2021 973  
Prior 324  
Revolving Loans 2,014  
Total loans 37,572  
Grade 2 [Member]    
Financing Receivable Impaired [Line Items]    
2024 111,834  
2023 12,444  
2022 23,838  
2021 1,893  
Prior 7,123  
Revolving Loans 24,906  
Total loans 182,038  
Grade 2 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2023 672  
2022 145  
Prior 13  
Total loans 830  
Grade 2 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2023 9  
2022 45  
Prior 568  
Total loans 622  
Grade 2 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2023 512  
2022 1,092  
2021 143  
Prior 2,145  
Total loans 3,892  
Grade 2 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2022 1,761  
Prior 1,041  
Revolving Loans 6,721  
Total loans 9,523  
Grade 2 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,776  
2023 653  
2022 6,913  
2021 1,750  
Prior 1,596  
Revolving Loans 18,103  
Total loans 30,791  
Grade 2 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2024 110,058  
2023 10,598  
2022 13,882  
Prior 1,760  
Revolving Loans 82  
Total loans 136,380  
Grade 3 [Member]    
Financing Receivable Impaired [Line Items]    
2025 1,563,092  
2024 1,929,110  
2023 2,625,986  
2022 3,903,562  
2021 2,992,419  
Prior 3,581,333  
Revolving Loans 1,266,744  
Revolving Loans Converted to Term Loans 41,025  
Total loans 17,903,271  
Grade 3 [Member] | Warehouse Purchase Program [Member]    
Financing Receivable Impaired [Line Items]    
2025 1,057,893  
Total loans 1,057,893  
Grade 3 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 151,175  
2024 656,718  
2023 401,854  
2022 467,856  
2021 173,816  
Prior 123,319  
Revolving Loans 97,929  
Total loans 2,072,667  
Grade 3 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2025 53,111  
2024 115,215  
2023 76,058  
2022 171,650  
2021 82,868  
Prior 130,218  
Revolving Loans 146,691  
Revolving Loans Converted to Term Loans 165  
Total loans 775,976  
Grade 3 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2025 103,328  
2024 522,235  
2023 1,544,528  
2022 2,181,515  
2021 1,851,108  
Prior 1,944,350  
Revolving Loans 104,648  
Revolving Loans Converted to Term Loans 4,441  
Total loans 8,256,153  
Grade 3 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2025 88,688  
2024 313,249  
2023 392,507  
2022 895,780  
2021 762,177  
Prior 1,148,674  
Revolving Loans 59,275  
Revolving Loans Converted to Term Loans 1,855  
Total loans 3,662,205  
Grade 3 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 81,549  
2024 296,992  
2023 188,260  
2022 156,883  
2021 104,983  
Prior 221,829  
Revolving Loans 819,558  
Revolving Loans Converted to Term Loans 34,564  
Total loans 1,904,618  
Grade 3 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2025 27,348  
2024 24,701  
2023 22,779  
2022 29,878  
2021 17,467  
Prior 12,943  
Revolving Loans 38,643  
Total loans 173,759  
Grade 4 [Member]    
Financing Receivable Impaired [Line Items]    
2025 42,178  
2024 271,429  
2023 352,571  
2022 664,810  
2021 387,663  
Prior 835,463  
Revolving Loans 163,472  
Revolving Loans Converted to Term Loans 20,355  
Total loans 2,737,941  
Grade 4 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 10,137  
2024 109,448  
2023 174,759  
2022 197,912  
2021 82,223  
Prior 19,303  
Revolving Loans 23,539  
Revolving Loans Converted to Term Loans 18,718  
Total loans 636,039  
Grade 4 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2025 14,993  
2024 38,458  
2023 14,098  
2022 23,317  
2021 27,570  
Prior 13,411  
Revolving Loans 37,077  
Revolving Loans Converted to Term Loans 28  
Total loans 168,952  
Grade 4 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2025 1,905  
2024 15,395  
2023 19,164  
2022 19,102  
2021 30,565  
Prior 69,106  
Revolving Loans 2,774  
Total loans 158,011  
Grade 4 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2025 11,203  
2024 55,086  
2023 108,977  
2022 396,266  
2021 240,063  
Prior 692,061  
Revolving Loans 5,648  
Revolving Loans Converted to Term Loans 500  
Total loans 1,509,804  
Grade 4 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 3,940  
2024 52,437  
2023 34,210  
2022 28,168  
2021 6,322  
Prior 25,010  
Revolving Loans 82,965  
Revolving Loans Converted to Term Loans 1,109  
Total loans 234,161  
Grade 4 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2024 605  
2023 1,363  
2022 45  
2021 920  
Prior 16,572  
Revolving Loans 11,469  
Total loans 30,974  
Grade 5 [Member]    
Financing Receivable Impaired [Line Items]    
2025 2,200  
2024 35,962  
2023 1,951  
2022 40,681  
2021 14,661  
Prior 194,385  
Revolving Loans 48,312  
Revolving Loans Converted to Term Loans 36  
Total loans 338,188  
Grade 5 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2025 928  
2024 4,626  
2023 13  
2021 7,420  
Prior 5,316  
Revolving Loans 5,200  
Total loans 23,503  
Grade 5 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2025 1,012  
2023 57  
2022 147  
2021 676  
Prior 1,094  
Total loans 2,986  
Grade 5 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2025 133  
2023 683  
2022 1,846  
Prior 2,920  
Revolving Loans 76  
Total loans 5,658  
Grade 5 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2024 26,059  
2023 1,039  
2022 19,897  
2021 5,889  
Prior 182,724  
Total loans 235,608  
Grade 5 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 127  
2024 5,277  
2023 159  
2022 18,791  
2021 676  
Prior 2,331  
Revolving Loans 42,929  
Revolving Loans Converted to Term Loans 36  
Total loans 70,326  
Grade 5 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
Revolving Loans 107  
Total loans 107  
Grade 6 [Member]    
Financing Receivable Impaired [Line Items]    
2025 4,817  
2024 38,535  
2023 8,591  
2022 11,625  
2021 2,250  
Prior 87,195  
Revolving Loans 30,205  
Revolving Loans Converted to Term Loans 14  
Total loans 183,232  
Grade 6 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 7,800  
2021 149  
Prior 642  
Total loans 8,591  
Grade 6 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2022 2,806  
Prior 671  
Total loans 3,477  
Grade 6 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2024 133  
2023 231  
2022 410  
2021 204  
Prior 3,615  
Total loans 4,593  
Grade 6 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2025 4,742  
2024 29,197  
2023 4,981  
2022 5,017  
2021 1,415  
Prior 82,058  
Total loans 127,410  
Grade 6 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2025 75  
2024 1,405  
2023 3,379  
2022 3,392  
2021 482  
Prior 209  
Revolving Loans 30,205  
Revolving Loans Converted to Term Loans 14  
Total loans 39,161  
Grade 7 [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,096  
2023 8,541  
2022 14,780  
2021 10,447  
Prior 16,049  
Revolving Loans 1,894  
Total loans 52,807  
Grade 7 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
Prior 13  
Total loans 13  
Grade 7 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 108  
2022 1,544  
2021 8  
Prior 331  
Total loans 1,991  
Grade 7 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2023 4,744  
2022 11,262  
2021 6,474  
Prior 14,523  
Revolving Loans 95  
Total loans 37,098  
Grade 7 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2024 146  
2023 38  
2022 1,594  
2021 3,859  
Prior 986  
Total loans 6,623  
Grade 7 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 842  
2023 3,759  
2022 376  
2021 106  
Prior 196  
Revolving Loans 1,799  
Total loans 7,078  
Grade 7 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2022 4  
Total loans $ 4  
[1] Includes $9.8 million and $10.7 million of residential mortgage loans held for sale at March 31, 2025 and December 31, 2024, respectively.