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Allowance for Credit Losses, Credit Quality and Other - Summary of Amortized Cost of Performing and Nonperforming Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One $ 1,557,221 $ 2,138,730
Year Two 2,239,000 3,341,500
Year Three 3,248,020 2,083,044
Year Four 1,679,539 1,132,926
Year Five 923,973 872,429
Prior 3,245,462 2,908,528
Revolving Loans Amortized Cost Basis 1,930,764 1,947,571
Total 14,823,979 14,424,728
Commercial real estate loans    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 935,554 930,022
Year Two 1,127,650 2,146,390
Year Three 2,023,558 1,262,133
Year Four 1,041,573 626,807
Year Five 486,086 481,164
Prior 2,071,625 1,905,250
Revolving Loans Amortized Cost Basis 887,874 816,391
Total 8,573,920 8,168,157
Commercial real estate loans | Non-farm/non-residential    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 218,451 388,831
Year Two 481,457 1,150,598
Year Three 1,068,460 830,588
Year Four 836,245 491,298
Year Five 401,616 404,822
Prior 1,910,085 1,747,135
Revolving Loans Amortized Cost Basis 580,222 536,682
Total 5,496,536 5,549,954
Commercial real estate loans | Non-farm/non-residential | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 218,451 388,831
Year Two 481,457 1,150,598
Year Three 1,068,305 821,373
Year Four 835,292 490,153
Year Five 387,389 404,061
Prior 1,871,118 1,718,776
Revolving Loans Amortized Cost Basis 580,142 536,349
Total 5,442,154 5,510,141
Commercial real estate loans | Non-farm/non-residential | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 155 9,215
Year Four 953 1,145
Year Five 14,227 761
Prior 38,967 28,359
Revolving Loans Amortized Cost Basis 80 333
Total 54,382 39,813
Commercial real estate loans | Construction/land development    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 667,797 501,215
Year Two 601,615 926,208
Year Three 894,340 384,657
Year Four 166,388 88,901
Year Five 51,652 55,857
Prior 88,489 81,216
Revolving Loans Amortized Cost Basis 271,138 254,993
Total 2,741,419 2,293,047
Commercial real estate loans | Construction/land development | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 667,797 501,215
Year Two 601,542 918,390
Year Three 891,810 382,954
Year Four 164,990 88,204
Year Five 51,470 55,239
Prior 87,594 81,028
Revolving Loans Amortized Cost Basis 270,156 253,667
Total 2,735,359 2,280,697
Commercial real estate loans | Construction/land development | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 0
Year Two 73 7,818
Year Three 2,530 1,703
Year Four 1,398 697
Year Five 182 618
Prior 895 188
Revolving Loans Amortized Cost Basis 982 1,326
Total 6,060 12,350
Commercial real estate loans | Agricultural    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 49,306 39,976
Year Two 44,578 69,584
Year Three 60,758 46,888
Year Four 38,940 46,608
Year Five 32,818 20,485
Prior 73,051 76,899
Revolving Loans Amortized Cost Basis 36,514 24,716
Total 335,965 325,156
Commercial real estate loans | Agricultural | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 49,306 39,976
Year Two 44,578 69,584
Year Three 60,758 46,809
Year Four 38,875 46,608
Year Five 32,818 20,485
Prior 72,572 76,547
Revolving Loans Amortized Cost Basis 36,321 24,716
Total 335,228 324,725
Commercial real estate loans | Agricultural | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 0 79
Year Four 65 0
Year Five 0 0
Prior 479 352
Revolving Loans Amortized Cost Basis 193 0
Total 737 431
Residential real estate loans | Residential 1-4 family    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 187,704 261,784
Year Two 256,902 409,197
Year Three 422,537 300,563
Year Four 261,251 171,122
Year Five 156,691 111,327
Prior 449,644 403,729
Revolving Loans Amortized Cost Basis 197,623 186,538
Total 1,932,352 1,844,260
Residential real estate loans | Residential 1-4 family | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 187,704 261,784
Year Two 255,185 405,239
Year Three 416,753 298,207
Year Four 257,574 167,475
Year Five 153,384 108,091
Prior 437,827 396,130
Revolving Loans Amortized Cost Basis 197,230 185,948
Total 1,905,657 1,822,874
Residential real estate loans | Residential 1-4 family | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 0
Year Two 1,717 3,958
Year Three 5,784 2,356
Year Four 3,677 3,647
Year Five 3,307 3,236
Prior 11,817 7,599
Revolving Loans Amortized Cost Basis 393 590
Total 26,695 21,386
Residential real estate loans | Multifamily residential    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 1,876 3,983
Year Two 11,822 87,012
Year Three 185,829 107,301
Year Four 47,043 108,702
Year Five 111,781 39,815
Prior 97,878 74,564
Revolving Loans Amortized Cost Basis 26,419 14,359
Total 482,648 435,736
Residential real estate loans | Multifamily residential | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 1,876 3,983
Year Two 11,822 87,012
Year Three 164,927 107,301
Year Four 46,451 108,702
Year Five 111,781 39,815
Prior 97,878 74,564
Revolving Loans Amortized Cost Basis 26,419 14,359
Total 461,154 435,736
Residential real estate loans | Multifamily residential | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 20,902 0
Year Four 592 0
Year Five 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 0 0
Total 21,494 0
Total real estate    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 1,125,134 1,195,789
Year Two 1,396,374 2,642,599
Year Three 2,631,924 1,669,997
Year Four 1,349,867 906,631
Year Five 754,558 632,306
Prior 2,619,147 2,383,543
Revolving Loans Amortized Cost Basis 1,111,916 1,017,288
Total 10,988,920 10,448,153
Consumer    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 219,061 255,930
Year Two 226,131 257,588
Year Three 228,528 216,645
Year Four 184,366 109,981
Year Five 92,448 110,406
Prior 265,784 200,071
Revolving Loans Amortized Cost Basis 2,879 3,069
Total 1,219,197 1,153,690
Consumer | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 218,988 255,771
Year Two 225,480 256,826
Year Three 225,577 215,831
Year Four 184,063 109,442
Year Five 91,893 110,267
Prior 259,861 198,982
Revolving Loans Amortized Cost Basis 2,808 3,060
Total 1,208,670 1,150,179
Consumer | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 73 159
Year Two 651 762
Year Three 2,951 814
Year Four 303 539
Year Five 555 139
Prior 5,923 1,089
Revolving Loans Amortized Cost Basis 71 9
Total 10,527 3,511
Commercial and industrial    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 133,512 619,371
Year Two 559,408 385,376
Year Three 339,418 156,919
Year Four 110,948 88,094
Year Five 51,754 114,522
Prior 311,045 276,677
Revolving Loans Amortized Cost Basis 578,582 684,032
Total 2,084,667 2,324,991
Commercial and industrial | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 133,512 616,809
Year Two 556,469 382,190
Year Three 336,274 156,056
Year Four 109,586 87,531
Year Five 51,740 111,529
Prior 306,000 273,434
Revolving Loans Amortized Cost Basis 577,929 680,552
Total 2,071,510 2,308,101
Commercial and industrial | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 2,562
Year Two 2,939 3,186
Year Three 3,144 863
Year Four 1,362 563
Year Five 14 2,993
Prior 5,045 3,243
Revolving Loans Amortized Cost Basis 653 3,480
Total 13,157 16,890
Agricultural & other    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 79,514 67,640
Year Two 57,087 55,937
Year Three 48,150 39,483
Year Four 34,358 28,220
Year Five 25,213 15,195
Prior 49,486 48,237
Revolving Loans Amortized Cost Basis 237,387 243,182
Total 531,195 497,894
Agricultural & other | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 79,514 67,569
Year Two 57,083 55,904
Year Three 48,150 39,473
Year Four 34,312 28,220
Year Five 25,209 15,195
Prior 48,579 48,203
Revolving Loans Amortized Cost Basis 237,274 242,818
Total 530,121 497,382
Agricultural & other | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 71
Year Two 4 33
Year Three 0 10
Year Four 46 0
Year Five 4 0
Prior 907 34
Revolving Loans Amortized Cost Basis 113 364
Total $ 1,074 $ 512