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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
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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

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