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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, 2022
Dec. 31, 2021
Financing Receivable Impaired [Line Items]    
2022 $ 2,523,912  
2021 4,806,467  
2020 2,828,783  
2019 1,659,793  
2018 1,313,141  
Prior 3,245,445  
Revolving Loans 1,678,144  
Revolving Loans Converted to Term Loans 11,839  
Total loans 18,067,524 $ 18,616,144
PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2021 19,691  
2020 24,867  
2019 6,747  
2018 8,943  
Prior 634  
Revolving Loans 7,793  
Total loans 68,675  
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]    
Financing Receivable Impaired [Line Items]    
2022 55,701  
2021 175,533  
2020 83,118  
2019 49,737  
2018 35,459  
Prior 112,211  
Revolving Loans 104,486  
Revolving Loans Converted to Term Loans 1,173  
Total loans 617,418 620,338
Agriculture and Agriculture Real Estate (Includes Farmland) [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2020 914  
Prior 222  
Total loans 1,136  
Warehouse Purchase Program [Member]    
Financing Receivable Impaired [Line Items]    
2022 1,344,541  
Total loans 1,344,541 1,775,699
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2022 219,815  
2021 1,114,763  
2020 547,535  
2019 216,074  
2018 45,885  
Prior 57,887  
Revolving Loans 118,469  
Revolving Loans Converted to Term Loans 7,409  
Total loans 2,327,837 2,299,715
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2019 119  
Prior 128  
Total loans 247  
Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2022 409,899  
2021 2,042,813  
2020 1,248,053  
2019 558,721  
2018 405,237  
Prior 1,063,178  
Revolving Loans 112,128  
Revolving Loans Converted to Term Loans 721  
Total loans [1] 5,840,750 5,668,708
Real Estate [Member] | 1-4 Family [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
Prior 159  
Total loans 159  
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2022 283,654  
2021 936,568  
2020 730,146  
2019 641,018  
2018 651,668  
Prior 1,808,840  
Revolving Loans 97,453  
Revolving Loans Converted to Term Loans 1,208  
Total loans 5,150,555 5,251,368
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2021 19,304  
2020 22,403  
2019 6,320  
2018 422  
Prior 60  
Total loans 48,509  
Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2022 176,413  
2021 470,066  
2020 175,409  
2019 170,260  
2018 160,566  
Prior 185,259  
Revolving Loans 1,200,890  
Revolving Loans Converted to Term Loans 1,127  
Total loans 2,539,990 2,711,820
Commercial and Industrial [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2021 387  
2020 143  
2019 308  
2018 8,521  
Prior 65  
Revolving Loans 7,793  
Total loans 17,217  
Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2022 33,889  
2021 66,724  
2020 44,522  
2019 23,983  
2018 14,326  
Prior 18,070  
Revolving Loans 44,718  
Revolving Loans Converted to Term Loans 201  
Total loans 246,433 $ 288,496
Consumer and Other [Member] | PCD Loans [Member]    
Financing Receivable Impaired [Line Items]    
2020 1,407  
Total loans 1,407  
Grade 1 [Member]    
Financing Receivable Impaired [Line Items]    
2022 13,708  
2021 116,102  
2020 12,919  
2019 3,643  
2018 4,045  
Prior 1,782  
Revolving Loans 35,970  
Revolving Loans Converted to Term Loans 82  
Total loans 188,251  
Grade 1 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]    
Financing Receivable Impaired [Line Items]    
2022 698  
2021 1,519  
2020 213  
2019 16  
2018 73  
Prior 133  
Revolving Loans 8,617  
Revolving Loans Converted to Term Loans 21  
Total loans 11,290  
Grade 1 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2020 114  
Total loans 114  
Grade 1 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2022 7,282  
2021 98,943  
2020 7,419  
2019 1,670  
2018 2,583  
Prior 323  
Revolving Loans 25,897  
Revolving Loans Converted to Term Loans 61  
Total loans 144,178  
Grade 1 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2022 5,728  
2021 15,640  
2020 5,173  
2019 1,957  
2018 1,389  
Prior 1,326  
Revolving Loans 1,456  
Total loans 32,669  
Grade 2 [Member]    
Financing Receivable Impaired [Line Items]    
2022 157  
2021 14,932  
2020 6,781  
2019 929  
2018 811  
Prior 19,494  
Revolving Loans 5,868  
Total loans 48,972  
Grade 2 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]    
Financing Receivable Impaired [Line Items]    
2021 207  
Prior 1,516  
Revolving Loans 41  
Total loans 1,764  
Grade 2 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
Prior 126  
Total loans 126  
Grade 2 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2021 237  
2020 260  
2019 83  
2018 165  
Prior 4,716  
Total loans 5,461  
Grade 2 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2021 12,907  
2020 5,223  
2019 265  
Prior 6,204  
Total loans 24,599  
Grade 2 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2022 37  
2021 447  
2020 448  
2019 52  
2018 309  
Prior 2,467  
Revolving Loans 3,924  
Total loans 7,684  
Grade 2 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2022 120  
2021 1,134  
2020 850  
2019 529  
2018 337  
Prior 4,465  
Revolving Loans 1,903  
Total loans 9,338  
Grade 3 [Member]    
Financing Receivable Impaired [Line Items]    
2022 2,396,044  
2021 4,285,491  
2020 2,480,268  
2019 1,494,849  
2018 1,037,722  
Prior 2,440,938  
Revolving Loans 1,470,082  
Revolving Loans Converted to Term Loans 9,372  
Total loans 15,614,766  
Grade 3 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]    
Financing Receivable Impaired [Line Items]    
2022 47,512  
2021 160,794  
2020 75,284  
2019 46,443  
2018 32,228  
Prior 99,155  
Revolving Loans 91,463  
Revolving Loans Converted to Term Loans 254  
Total loans 553,133  
Grade 3 [Member] | Warehouse Purchase Program [Member]    
Financing Receivable Impaired [Line Items]    
2022 1,344,541  
Total loans 1,344,541  
Grade 3 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2022 199,287  
2021 1,060,570  
2020 492,468  
2019 194,684  
2018 37,041  
Prior 48,818  
Revolving Loans 110,123  
Revolving Loans Converted to Term Loans 7,409  
Total loans 2,150,400  
Grade 3 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2022 408,363  
2021 2,026,719  
2020 1,232,977  
2019 541,955  
2018 379,875  
Prior 993,833  
Revolving Loans 110,646  
Revolving Loans Converted to Term Loans 721  
Total loans 5,695,089  
Grade 3 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2022 232,176  
2021 670,748  
2020 504,759  
2019 563,704  
2018 469,964  
Prior 1,128,958  
Revolving Loans 84,888  
Revolving Loans Converted to Term Loans 498  
Total loans 3,655,695  
Grade 3 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2022 136,124  
2021 319,189  
2020 140,989  
2019 126,602  
2018 106,379  
Prior 158,025  
Revolving Loans 1,040,634  
Revolving Loans Converted to Term Loans 289  
Total loans 2,028,231  
Grade 3 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2022 28,041  
2021 47,471  
2020 33,791  
2019 21,461  
2018 12,235  
Prior 12,149  
Revolving Loans 32,328  
Revolving Loans Converted to Term Loans 201  
Total loans 187,677  
Grade 4 [Member]    
Financing Receivable Impaired [Line Items]    
2022 113,426  
2021 330,720  
2020 238,014  
2019 128,184  
2018 203,896  
Prior 638,140  
Revolving Loans 126,765  
Revolving Loans Converted to Term Loans 1,898  
Total loans 1,781,043  
Grade 4 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]    
Financing Receivable Impaired [Line Items]    
2022 7,491  
2021 10,631  
2020 5,033  
2019 2,679  
2018 3,066  
Prior 9,632  
Revolving Loans 3,099  
Revolving Loans Converted to Term Loans 898  
Total loans 42,529  
Grade 4 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2022 20,528  
2021 47,619  
2020 52,487  
2019 9,012  
2018 8,844  
Prior 7,558  
Revolving Loans 6,967  
Total loans 153,015  
Grade 4 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2022 1,486  
2021 15,209  
2020 13,012  
2019 14,855  
2018 18,224  
Prior 53,441  
Revolving Loans 1,482  
Total loans 117,709  
Grade 4 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2022 51,451  
2021 225,803  
2020 147,478  
2019 66,816  
2018 130,943  
Prior 543,878  
Revolving Loans 11,860  
Revolving Loans Converted to Term Loans 710  
Total loans 1,178,939  
Grade 4 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2022 32,470  
2021 28,979  
2020 16,711  
2019 34,786  
2018 42,461  
Prior 23,501  
Revolving Loans 94,352  
Revolving Loans Converted to Term Loans 290  
Total loans 273,550  
Grade 4 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2021 2,479  
2020 3,293  
2019 36  
2018 358  
Prior 130  
Revolving Loans 9,005  
Total loans 15,301  
Grade 5 [Member]    
Financing Receivable Impaired [Line Items]    
2022 577  
2021 18,054  
2020 32,191  
2019 23,379  
2018 48,349  
Prior 52,415  
Revolving Loans 23,131  
Revolving Loans Converted to Term Loans 241  
Total loans 198,337  
Grade 5 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]    
Financing Receivable Impaired [Line Items]    
2021 1,505  
2020 1,436  
2019 536  
2018 33  
Prior 535  
Revolving Loans 1,245  
Total loans 5,290  
Grade 5 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2021 6,233  
2019 12,259  
Prior 760  
Revolving Loans 1,079  
Total loans 20,331  
Grade 5 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2022 50  
2020 918  
2019 301  
2018 144  
Prior 3,225  
Total loans 4,638  
Grade 5 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2022 27  
2021 393  
2020 24,309  
2019 3,765  
2018 48,021  
Prior 47,223  
Revolving Loans 705  
Total loans 124,443  
Grade 5 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2022 500  
2021 9,923  
2020 5,528  
2019 6,518  
2018 151  
Prior 672  
Revolving Loans 20,102  
Revolving Loans Converted to Term Loans 241  
Total loans 43,635  
Grade 6 [Member]    
Financing Receivable Impaired [Line Items]    
2021 20,508  
2020 32,617  
2019 392  
2018 6,354  
Prior 77,979  
Revolving Loans 7,619  
Revolving Loans Converted to Term Loans 246  
Total loans 145,715  
Grade 6 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]    
Financing Receivable Impaired [Line Items]    
2021 877  
2020 25  
2019 32  
2018 58  
Prior 815  
Total loans 1,807  
Grade 6 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
2021 341  
2020 2,580  
Prior 486  
Total loans 3,407  
Grade 6 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2021 241  
2020 17  
2019 56  
2018 4,972  
Prior 711  
Total loans 5,997  
Grade 6 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2021 7,404  
2020 25,974  
2019 148  
2018 1,193  
Prior 75,966  
Total loans 110,685  
Grade 6 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2021 11,645  
2020 4,021  
2019 156  
2018 131  
Prior 1  
Revolving Loans 7,593  
Revolving Loans Converted to Term Loans 246  
Total loans 23,793  
Grade 6 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
Revolving Loans 26  
Total loans 26  
Grade 7 [Member]    
Financing Receivable Impaired [Line Items]    
2021 969  
2020 1,126  
2019 1,670  
2018 3,021  
Prior 14,063  
Revolving Loans 916  
Total loans 21,765  
Grade 7 [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]    
Financing Receivable Impaired [Line Items]    
2020 213  
2019 31  
2018 1  
Prior 203  
Revolving Loans 21  
Total loans 469  
Grade 7 [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable Impaired [Line Items]    
Prior 11  
Revolving Loans 300  
Total loans 311  
Grade 7 [Member] | Real Estate [Member] | 1-4 Family [Member]    
Financing Receivable Impaired [Line Items]    
2021 407  
2020 755  
2019 1,471  
2018 1,857  
Prior 7,093  
Total loans 11,583  
Grade 7 [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]    
Financing Receivable Impaired [Line Items]    
2021 9  
2018 1,125  
Prior 6,551  
Total loans 7,685  
Grade 7 [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
2021 553  
2020 150  
2019 168  
2018 31  
Prior 205  
Revolving Loans 595  
Total loans 1,702  
Grade 7 [Member] | Consumer and Other [Member]    
Financing Receivable Impaired [Line Items]    
2020 8  
2018 7  
Total loans $ 15  
[1] Includes $2.8 million and $7.3 million of residential mortgage loans held for sale at March 31, 2022 and December 31, 2021, respectively.