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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, 2024
Dec. 31, 2023
Financing Receivable Impaired [Line Items]    
2024 $ 1,436,156  
2023 5,021,382  
2022 2,122,994  
2021 3,825,943  
2020 3,006,481  
Prior 4,179,751  
Revolving Loans 1,632,109  
Revolving Loans Converted to Term Loans 40,431  
Total loans 21,265,247 $ 21,180,538
Current-period gross write-offs, 2024 1,470  
Current-period gross write-offs, 2023 755  
Current-period gross write-offs, 2022 33  
Current-period gross write-offs, 2021 63  
Current-period gross write-offs, 2020 73  
Current-period gross write-offs, Prior 254  
Current-period gross write-offs, Revolving Loans 953  
Current-period gross write-offs, Total 3,601  
PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,758  
2023 172,461  
2022 61,891  
2021 69,943  
2020 49,529  
Prior 86,242  
Revolving Loans 45,889  
Total loans 487,713  
Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
Total loans 813,092 816,043
Warehouse Purchase Program [Member]    
Financing Receivable Impaired [Line Items]    
2024 864,924  
Total loans 864,924 822,245
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 108,055  
2023 860,865  
2022 945,805  
2021 430,233  
2020 252,132  
Prior 108,236  
Revolving Loans 171,262  
Total loans 2,876,588 3,076,591
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,218  
2023 29,616  
2022 98,450  
2021 15,171  
2020 7,649  
Prior 7,371  
Revolving Loans 20,391  
Total loans 179,866  
Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 24,932  
2023 150,882  
2022 193,915  
2021 105,762  
2020 67,195  
Prior 134,535  
Revolving Loans 135,777  
Revolving Loans Converted to Term Loans 94  
Total loans 813,092  
Current-period gross write-offs, Prior 121  
Current-period gross write-offs, Total 121  
Real Estate [Member] | Agriculture [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2023 1,986  
2022 2,532  
2021 1,345  
2020 14,558  
Prior 2,630  
Revolving Loans 2,693  
Total loans 25,744  
Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2024 110,434  
2023 1,191,104  
2022 2,283,692  
2021 2,172,423  
2020 1,032,953  
Prior 1,393,290  
Revolving Loans 94,563  
Revolving Loans Converted to Term Loans 2,961  
Total loans [1] 8,281,420 8,168,078
Current-period gross write-offs, 2022 389  
Current-period gross write-offs, 2020 33  
Current-period gross write-offs, Prior 39  
Current-period gross write-offs, Total 461  
Real Estate [Member] | 1-4 Family [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2023 625  
2022 4,243  
2021 475  
2020 469  
Prior 2,121  
Total loans 7,933  
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2024 53,699  
2023 461,847  
2022 1,228,640  
2021 909,352  
2020 673,842  
Prior 2,203,321  
Revolving Loans 96,168  
Revolving Loans Converted to Term Loans 4,591  
Total loans 5,631,460 5,662,948
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 540  
2023 13,613  
2022 53,166  
2021 49,281  
2020 38,547  
Prior 71,666  
Revolving Loans 329  
Total loans 227,142  
Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 239,312  
2023 274,792  
2022 311,267  
2021 179,447  
2020 67,902  
Prior 312,993  
Revolving Loans 1,052,361  
Revolving Loans Converted to Term Loans 32,774  
Total loans 2,470,848 2,305,040
Current-period gross write-offs, 2023 53  
Current-period gross write-offs, 2022 349  
Current-period gross write-offs, 2021 39  
Current-period gross write-offs, Prior 24  
Current-period gross write-offs, Revolving Loans 895  
Current-period gross write-offs, Total 1,360  
Commercial and Industrial [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2023 3,689  
2022 14,070  
2021 3,637  
2020 661  
Prior 2,439  
Revolving Loans 22,462  
Total loans 46,958  
Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2024 34,800  
2023 66,991  
2022 58,063  
2021 28,726  
2020 28,970  
Prior 27,376  
Revolving Loans 81,978  
Revolving Loans Converted to Term Loans 11  
Total loans 326,915 $ 329,593
Current-period gross write-offs, 2024 1,470  
Current-period gross write-offs, 2023 20  
Current-period gross write-offs, 2022 17  
Current-period gross write-offs, 2021 24  
Current-period gross write-offs, 2020 0  
Current-period gross write-offs, Prior 70  
Current-period gross write-offs, Revolving Loans 58  
Current-period gross write-offs, Total 1,659  
Consumer and Other [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2021 34  
2020 7  
Prior 15  
Revolving Loans 14  
Total loans 70  
Grade 1 [Member]    
Financing Receivable Impaired [Line Items]    
2024 11,726  
2023 16,221  
2022 4,853  
2021 9,403  
2020 29,040  
Prior 12,471  
Revolving Loans 52,538  
Revolving Loans Converted to Term Loans 176  
Total loans 136,428  
Grade 1 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 720  
2023 1,179  
2022 1,231  
2021 172  
2020 252  
Prior 369  
Revolving Loans 8,590  
Total loans 12,513  
Grade 1 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2023 74  
2022 153  
2020 109  
Total loans 336  
Grade 1 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 6,392  
2023 15,267  
2022 9,372  
2021 6,418  
2020 2,811  
Prior 6,188  
Revolving Loans 41,360  
Revolving Loans Converted to Term Loans 176  
Total loans 87,984  
Grade 1 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2024 4,614  
2023 12,520  
2022 5,465  
2021 2,813  
2020 1,681  
Prior 5,914  
Revolving Loans 2,588  
Total loans 35,595  
Grade 2 [Member]    
Financing Receivable Impaired [Line Items]    
2024 6,132  
2023 24,577  
2022 890  
2021 473  
2020 14,746  
Prior 11,060  
Revolving Loans 3,848  
Total loans 61,726  
Grade 2 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2023 1,106  
2022 166  
Prior 14  
Total loans 1,286  
Grade 2 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2023 13  
2022 60  
2021 101  
Prior 722  
Revolving Loans 46  
Total loans 942  
Grade 2 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2023 526  
2022 1,243  
2021 153  
2020 236  
Prior 2,602  
Total loans 4,760  
Grade 2 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2022 1,128  
2020 459  
Prior 2,232  
Total loans 3,819  
Grade 2 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2023 695  
2022 7,799  
2021 219  
2020 195  
Prior 3,651  
Revolving Loans 2,295  
Total loans 14,854  
Grade 2 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2024 6,132  
2023 12,406  
2022 14,181  
Prior 1,839  
Revolving Loans 1,507  
Total loans 36,065  
Grade 3 [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,384,010  
2023 4,288,187  
2022 1,752,316  
2021 3,434,462  
2020 2,694,771  
Prior 2,938,298  
Revolving Loans 1,376,075  
Revolving Loans Converted to Term Loans 37,729  
Total loans 17,905,848  
Grade 3 [Member] | Warehouse Purchase Program [Member]    
Financing Receivable Impaired [Line Items]    
2024 864,924  
Total loans 864,924  
Grade 3 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 103,359  
2023 745,828  
2022 696,969  
2021 364,477  
2020 215,354  
Prior 57,308  
Revolving Loans 119,072  
Total loans 2,302,367  
Grade 3 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 20,051  
2023 126,212  
2022 168,180  
2021 76,630  
2020 47,924  
Prior 118,858  
Revolving Loans 102,641  
Revolving Loans Converted to Term Loans 94  
Total loans 660,590  
Grade 3 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2024 109,256  
2023 1,172,870  
2022 2,253,123  
2021 2,140,728  
2020 1,021,887  
Prior 1,310,779  
Revolving Loans 91,597  
Revolving Loans Converted to Term Loans 2,757  
Total loans 8,102,997  
Grade 3 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2024 50,492  
2023 403,245  
2022 908,841  
2021 680,193  
2020 405,589  
Prior 1,246,771  
Revolving Loans 77,627  
Revolving Loans Converted to Term Loans 4,591  
Total loans 3,777,349  
Grade 3 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 211,874  
2023 206,299  
2022 222,945  
2021 147,665  
2020 49,661  
Prior 187,230  
Revolving Loans 910,134  
Revolving Loans Converted to Term Loans 30,276  
Total loans 1,966,084  
Grade 3 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2024 24,054  
2023 40,317  
2022 38,129  
2021 24,769  
2020 11,901  
Prior 17,352  
Revolving Loans 75,004  
Revolving Loans Converted to Term Loans 11  
Total loans 231,537  
Grade 4 [Member]    
Financing Receivable Impaired [Line Items]    
2024 31,392  
2023 475,006  
2022 259,716  
2021 282,292  
2020 209,728  
Prior 929,581  
Revolving Loans 139,245  
Revolving Loans Converted to Term Loans 2,426  
Total loans 2,329,386  
Grade 4 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2024 3,478  
2023 83,562  
2022 146,216  
2021 42,544  
2020 5,572  
Prior 26,944  
Revolving Loans 30,782  
Total loans 339,098  
Grade 4 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 3,436  
2023 21,435  
2022 19,644  
2021 25,993  
2020 4,122  
Prior 9,589  
Revolving Loans 21,807  
Total loans 106,026  
Grade 4 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2024 1,178  
2023 15,265  
2022 15,813  
2021 25,722  
2020 5,681  
Prior 64,138  
Revolving Loans 2,871  
Revolving Loans Converted to Term Loans 204  
Total loans 130,872  
Grade 4 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2024 2,667  
2023 43,104  
2022 262,140  
2021 172,287  
2020 217,796  
Prior 716,336  
Revolving Loans 15,857  
Total loans 1,430,187  
Grade 4 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 20,633  
2023 44,614  
2022 30,936  
2021 14,641  
2020 11,286  
Prior 110,319  
Revolving Loans 65,063  
Revolving Loans Converted to Term Loans 2,222  
Total loans 299,714  
Grade 4 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2023 1,748  
2022 257  
2021 1,105  
2020 15,259  
Prior 2,255  
Revolving Loans 2,865  
Total loans 23,489  
Grade 5 [Member]    
Financing Receivable Impaired [Line Items]    
2024 725  
2023 27,727  
2022 25,158  
2021 11,713  
2020 266  
Prior 109,666  
Revolving Loans 11,324  
Revolving Loans Converted to Term Loans 100  
Total loans 186,679  
Grade 5 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2022 1,357  
2020 23,373  
Prior 15,796  
Revolving Loans 769  
Total loans 41,295  
Grade 5 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2024 725  
2023 57  
2022 799  
2021 885  
Prior 1,143  
Total loans 3,609  
Grade 5 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2022 1,206  
2020 119  
Prior 2,517  
Total loans 3,842  
Grade 5 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2023 192  
2022 2,538  
2021 4,771  
Prior 89,422  
Revolving Loans 2,355  
Total loans 99,278  
Grade 5 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2023 17  
2022 21,827  
2021 6,057  
2020 1,666  
Prior 788  
Revolving Loans 8,200  
Revolving Loans Converted to Term Loans 100  
Total loans 38,655  
Grade 6 [Member]    
Financing Receivable Impaired [Line Items]    
2024 413  
2023 4,286  
2022 12,008  
2021 8,793  
2020 881  
Prior 80,646  
Revolving Loans 2,390  
Total loans 109,417  
Grade 6 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2023 570  
2021 7,698  
2020 184  
Prior 561  
Total loans 9,013  
Grade 6 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2021 78  
Prior 1,195  
Total loans 1,273  
Grade 6 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2022 357  
2021 41  
2020 19  
Prior 1,840  
Total loans 2,257  
Grade 6 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2021 356  
2020 11,451  
Prior 76,088  
Total loans 87,895  
Grade 6 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2024 413  
2023 311  
2022 3,898  
2021 615  
2020 354  
Prior 962  
Revolving Loans 2,390  
Total loans 8,943  
Grade 6 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2022 31  
2021 5  
Total loans 36  
Grade 7 [Member]    
Financing Receivable Impaired [Line Items]    
2023 12,917  
2022 6,162  
2021 8,864  
2020 7,520  
Prior 11,787  
Revolving Loans 800  
Total loans 48,050  
Grade 7 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2023 183  
2022 2,647  
2021 343  
Prior 242  
Revolving Loans 248  
Total loans 3,663  
Grade 7 [Member] | Real Estate [Member] | Agriculture [Member]    
Financing Receivable Impaired [Line Items]    
2022 1,469  
2021 558  
2020 339  
Prior 29  
Total loans 2,395  
Grade 7 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2023 1,744  
2022 7,554  
2021 5,304  
2020 4,433  
Prior 9,293  
Revolving Loans 95  
Total loans 28,423  
Grade 7 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2023 1,693  
2022 827  
2021 2,464  
Prior 806  
Total loans 5,790  
Grade 7 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2023 3,900  
2022 420  
2021 195  
2020 1,268  
Prior 1,416  
Revolving Loans 457  
Total loans 7,656  
Grade 7 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2020 122  
Prior 1  
Total loans $ 123  
[1] Includes $6.4 million and $5.7 million of residential mortgage loans held for sale at March 31, 2024 and December 31, 2023, respectively.