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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, 2024
Dec. 31, 2023
Financing Receivable Impaired [Line Items]    
2024 $ 2,903,789  
2023 3,026,717  
2022 5,018,954  
2021 3,802,278  
2020 2,064,175  
Prior 3,774,173  
Revolving Loans 1,759,866  
Revolving Loans Converted to Term Loans 30,900  
Total loans 22,380,852 $ 21,180,538
Current-period gross write-offs, 2024 4,168  
Current-period gross write-offs, 2023 1,320  
Current-period gross write-offs, 2022 2,900  
Current-period gross write-offs, 2021 1,830  
Current-period gross write-offs, 2020 1,761  
Current-period gross write-offs, Prior 1,260  
Current-period gross write-offs, Revolving Loans 3,015  
Current-period gross write-offs, Total 16,259  
PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 28,707  
2023 67,091  
2022 151,923  
2021 54,422  
2020 25,137  
Prior 83,661  
Revolving Loans 49,442  
Revolving Loans Converted to Term Loans 0  
Total loans 460,383  
Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
Total loans 1,033,224 816,043
Warehouse Purchase Program [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,228,706  
Total loans 1,228,706 822,245
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 451,554  
2023 743,812  
2022 762,203  
2021 360,117  
2020 225,664  
Prior 93,168  
Revolving Loans 151,910  
Revolving Loans Converted to Term Loans 26,093  
Total loans 2,814,521 3,076,591
Current-period gross write-offs, 2023 377  
Current-period gross write-offs, 2022 109  
Current-period gross write-offs, Total 486  
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 8,441  
2023 20,022  
2022 53,663  
2021 9,561  
2020 4,688  
Prior 6,655  
Revolving Loans 20,470  
Total loans 123,500  
Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 178,351  
2023 145,345  
2022 230,999  
2021 116,584  
2020 60,648  
Prior 125,666  
Revolving Loans 175,449  
Revolving Loans Converted to Term Loans 182  
Total loans 1,033,224  
Current-period gross write-offs, 2022 109  
Current-period gross write-offs, 2021 62  
Current-period gross write-offs, 2020 339  
Current-period gross write-offs, Prior 121  
Current-period gross write-offs, Total 631  
Real Estate [Member] | Agriculture [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 18,047  
2023 1,874  
2022 15,708  
2021 2,034  
2020 3,410  
Prior 2,731  
Revolving Loans 17,195  
Total loans 60,999  
Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2024 317,852  
2023 1,274,805  
2022 2,391,094  
2021 2,134,069  
2020 986,647  
Prior 1,271,812  
Revolving Loans 100,376  
Revolving Loans Converted to Term Loans 879  
Total loans [1] 8,477,534 8,168,078
Current-period gross write-offs, 2023 93  
Current-period gross write-offs, 2022 1,024  
Current-period gross write-offs, 2021 116  
Current-period gross write-offs, 2020 33  
Current-period gross write-offs, Prior 70  
Current-period gross write-offs, Total 1,336  
Real Estate [Member] | 1-4 Family [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 336  
2023 972  
2022 2,771  
2021 470  
2020 517  
Prior 1,715  
Total loans 6,781  
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2024 199,967  
2023 536,809  
2022 1,313,512  
2021 1,015,711  
2020 697,458  
Prior 2,038,738  
Revolving Loans 67,239  
Revolving Loans Converted to Term Loans 253  
Total loans 5,869,687 5,662,948
Current-period gross write-offs, 2022 167  
Current-period gross write-offs, 2021 481  
Current-period gross write-offs, Prior 160  
Current-period gross write-offs, Total 808  
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2023 42,731  
2022 72,240  
2021 40,220  
2020 16,477  
Prior 69,244  
Revolving Loans 329  
Total loans 241,241  
Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 365,310  
2023 270,868  
2022 267,827  
2021 152,932  
2020 67,427  
Prior 221,589  
Revolving Loans 1,194,241  
Revolving Loans Converted to Term Loans 3,438  
Total loans 2,543,632 2,305,040
Current-period gross write-offs, 2024 169  
Current-period gross write-offs, 2023 642  
Current-period gross write-offs, 2022 1,435  
Current-period gross write-offs, 2021 1,144  
Current-period gross write-offs, 2020 1,336  
Current-period gross write-offs, Prior 604  
Current-period gross write-offs, Revolving Loans 2,953  
Current-period gross write-offs, Total 8,283  
Commercial and Industrial [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,883  
2023 1,492  
2022 7,541  
2021 2,114  
2020 45  
Prior 3,307  
Revolving Loans 11,433  
Total loans 27,815  
Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2024 162,049  
2023 55,078  
2022 53,319  
2021 22,865  
2020 26,331  
Prior 23,200  
Revolving Loans 70,651  
Revolving Loans Converted to Term Loans 55  
Total loans 413,548 $ 329,593
Current-period gross write-offs, 2024 3,999  
Current-period gross write-offs, 2023 208  
Current-period gross write-offs, 2022 56  
Current-period gross write-offs, 2021 27  
Current-period gross write-offs, 2020 53  
Current-period gross write-offs, Prior 305  
Current-period gross write-offs, Revolving Loans 62  
Current-period gross write-offs, Revolving Loans Converted to Term Loans 5  
Current-period gross write-offs, Total 4,715  
Consumer and Other [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2021 23  
2020 0  
Prior 9  
Revolving Loans 15  
Total loans 47  
Grade 1 [Member]    
Financing Receivable Impaired [Line Items]    
2024 59,220  
2023 20,376  
2022 13,060  
2021 5,965  
2020 3,791  
Prior 9,765  
Revolving Loans 59,111  
Revolving Loans Converted to Term Loans 176  
Total loans 171,464  
Grade 1 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,132  
2023 540  
2022 975  
2021 85  
2020 183  
Prior 405  
Revolving Loans 10,047  
Total loans 13,379  
Grade 1 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2023 73  
2022 147  
2020 108  
Total loans 328  
Grade 1 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 42,831  
2023 11,280  
2022 7,730  
2021 3,498  
2020 2,165  
Prior 4,698  
Revolving Loans 46,472  
Revolving Loans Converted to Term Loans 155  
Total loans 118,829  
Grade 1 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2024 15,257  
2023 8,483  
2022 4,208  
2021 2,382  
2020 1,335  
Prior 4,662  
Revolving Loans 2,592  
Revolving Loans Converted to Term Loans 9  
Total loans 38,928  
Grade 2 [Member]    
Financing Receivable Impaired [Line Items]    
2024 112,543  
2023 17,383  
2022 23,865  
2021 394  
2020 607  
Prior 10,193  
Revolving Loans 26,213  
Total loans 191,198  
Grade 2 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2023 921  
2022 157  
Prior 13  
Total loans 1,091  
Grade 2 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2023 247  
2022 60  
2021 57  
Prior 683  
Total loans 1,047  
Grade 2 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2023 404  
2022 1,144  
2021 148  
Prior 2,316  
Total loans 4,012  
Grade 2 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2022 1,070  
2020 435  
Prior 2,020  
Total loans 3,525  
Grade 2 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 2,202  
2023 3,252  
2022 7,255  
2021 148  
2020 118  
Prior 3,361  
Revolving Loans 6,207  
Total loans 22,543  
Grade 2 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2024 110,341  
2023 12,559  
2022 14,179  
2021 41  
Prior 1,800  
Revolving Loans 20,006  
Total loans 158,980  
Grade 3 [Member]    
Financing Receivable Impaired [Line Items]    
2024 2,572,467  
2023 2,624,605  
2022 4,236,096  
2021 3,334,675  
2020 1,623,859  
Prior 2,647,951  
Revolving Loans 1,437,877  
Revolving Loans Converted to Term Loans 11,957  
Total loans 18,489,487  
Grade 3 [Member] | Warehouse Purchase Program [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,228,706  
Total loans 1,228,706  
Grade 3 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 410,166  
2023 611,667  
2022 537,443  
2021 265,630  
2020 122,745  
Prior 42,038  
Revolving Loans 110,971  
Revolving Loans Converted to Term Loans 8,869  
Total loans 2,109,529  
Grade 3 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 143,498  
2023 122,082  
2022 193,582  
2021 86,595  
2020 50,888  
Prior 107,228  
Revolving Loans 120,427  
Revolving Loans Converted to Term Loans 142  
Total loans 824,442  
Grade 3 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2024 310,005  
2023 1,252,218  
2022 2,353,241  
2021 2,100,201  
2020 971,979  
Prior 1,186,914  
Revolving Loans 96,313  
Revolving Loans Converted to Term Loans 879  
Total loans 8,271,750  
Grade 3 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2024 192,738  
2023 422,199  
2022 926,952  
2021 727,824  
2020 413,895  
Prior 1,129,802  
Revolving Loans 51,405  
Revolving Loans Converted to Term Loans 253  
Total loans 3,865,068  
Grade 3 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 250,903  
2023 183,975  
2022 190,192  
2021 135,024  
2020 54,337  
Prior 167,734  
Revolving Loans 1,014,305  
Revolving Loans Converted to Term Loans 1,813  
Total loans 1,998,283  
Grade 3 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2024 36,451  
2023 32,464  
2022 34,686  
2021 19,401  
2020 10,015  
Prior 14,235  
Revolving Loans 44,456  
Revolving Loans Converted to Term Loans 1  
Total loans 191,709  
Grade 4 [Member]    
Financing Receivable Impaired [Line Items]    
2024 101,945  
2023 284,388  
2022 538,665  
2021 378,179  
2020 330,414  
Prior 732,546  
Revolving Loans 169,338  
Revolving Loans Converted to Term Loans 18,722  
Total loans 2,554,197  
Grade 4 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 32,881  
2023 111,188  
2022 167,799  
2021 77,493  
2020 64,818  
Prior 28,277  
Revolving Loans 19,451  
Revolving Loans Converted to Term Loans 17,224  
Total loans 519,131  
Grade 4 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 14,626  
2023 20,545  
2022 15,681  
2021 26,758  
2020 6,167  
Prior 12,127  
Revolving Loans 27,780  
Revolving Loans Converted to Term Loans 28  
Total loans 123,712  
Grade 4 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2024 7,511  
2023 17,291  
2022 22,220  
2021 27,744  
2020 8,463  
Prior 66,167  
Revolving Loans 3,862  
Total loans 153,258  
Grade 4 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2024 7,229  
2023 66,531  
2022 302,535  
2021 239,074  
2020 227,702  
Prior 587,942  
Revolving Loans 15,455  
Total loans 1,446,468  
Grade 4 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 39,698  
2023 67,267  
2022 30,184  
2021 6,092  
2020 8,340  
Prior 35,539  
Revolving Loans 99,458  
Revolving Loans Converted to Term Loans 1,470  
Total loans 288,048  
Grade 4 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2023 1,566  
2022 246  
2021 1,018  
2020 14,924  
Prior 2,494  
Revolving Loans 3,332  
Total loans 23,580  
Grade 5 [Member]    
Financing Receivable Impaired [Line Items]    
2024 28,454  
2023 3,089  
2022 33,454  
2021 8,167  
2020 57,514  
Prior 176,768  
Revolving Loans 13,345  
Total loans 320,791  
Grade 5 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 66  
2023 14  
2022 3,037  
2020 33,234  
Prior 15,627  
Revolving Loans 795  
Total loans 52,773  
Grade 5 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,048  
2023 57  
2022 730  
2021 782  
Prior 1,120  
Total loans 3,737  
Grade 5 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2023 693  
2022 1,364  
2020 1,162  
Prior 1,886  
Revolving Loans 76  
Total loans 5,181  
Grade 5 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2023 2,325  
2022 7,558  
2021 7,190  
2020 21,762  
Prior 152,210  
Revolving Loans 0  
Total loans 191,045  
Grade 5 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 27,340  
2022 20,765  
2021 195  
2020 1,356  
Prior 5,925  
Revolving Loans 12,224  
Total loans 67,805  
Grade 5 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
Revolving Loans 250  
Total loans 250  
Grade 6 [Member]    
Financing Receivable Impaired [Line Items]    
2024 391  
2023 748  
2022 9,122  
2021 8,270  
2020 16,071  
Prior 97,096  
Revolving Loans 4,032  
Total loans 135,730  
Grade 6 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2021 7,317  
2020 179  
Prior 492  
Total loans 7,988  
Grade 6 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2022 2,844  
2021 74  
Prior 1,165  
Total loans 4,083  
Grade 6 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2023 19  
2022 374  
2021 0  
2020 17  
Prior 1,431  
Total loans 1,841  
Grade 6 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2023 597  
2022 2,376  
2021 339  
2020 15,619  
Prior 93,984  
Total loans 112,915  
Grade 6 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 391  
2023 132  
2022 3,528  
2021 540  
2020 256  
Prior 24  
Revolving Loans 4,032  
Total loans 8,903  
Grade 7 [Member]    
Financing Receivable Impaired [Line Items]    
2024 62  
2023 9,037  
2022 12,769  
2021 12,206  
2020 6,782  
Prior 16,193  
Revolving Loans 508  
Revolving Loans Converted to Term Loans 45  
Total loans 57,602  
Grade 7 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2022 104  
2021 116  
Prior 66  
Revolving Loans 223  
Total loans 509  
Grade 7 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2022 1,419  
2021 199  
Prior 207  
Total loans 1,825  
Grade 7 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2023 3,135  
2022 9,833  
2021 5,506  
2020 4,401  
Prior 11,383  
Revolving Loans 125  
Total loans 34,383  
Grade 7 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2023 2,426  
2022 781  
2021 1,064  
2020 1,568  
Prior 3,536  
Revolving Loans 50  
Total loans 9,425  
Grade 7 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 62  
2023 3,470  
2022 632  
2021 5,321  
2020 810  
Prior 1,001  
Revolving Loans 110  
Total loans 11,406  
Grade 7 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2023 6  
2020 3  
Revolving Loans Converted to Term Loans 45  
Total loans $ 54  
[1] Includes $6.1 million and $5.7 million of residential mortgage loans held for sale at September 30, 2024 and December 31, 2023, respectively.