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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
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One $ 430,301 $ 2,138,730
Year Two 2,131,418 3,341,500
Year Three 3,310,602 2,083,044
Year Four 1,991,010 1,132,926
Year Five 1,013,542 872,429
Prior 3,636,939 2,908,528
Revolving Loans Amortized Cost Basis 1,999,861 1,947,571
Total 14,513,673 14,424,728
Commercial real estate loans    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 233,110 930,022
Year Two 1,040,059 2,146,390
Year Three 2,100,729 1,262,133
Year Four 1,231,875 626,807
Year Five 532,587 481,164
Prior 2,301,263 1,905,250
Revolving Loans Amortized Cost Basis 845,515 816,391
Total 8,285,138 8,168,157
Commercial real estate loans | Non-farm/non-residential    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 91,081 388,831
Year Two 489,474 1,150,598
Year Three 1,103,794 830,588
Year Four 852,764 491,298
Year Five 422,460 404,822
Prior 2,086,282 1,747,135
Revolving Loans Amortized Cost Basis 571,110 536,682
Total 5,616,965 5,549,954
Commercial real estate loans | Non-farm/non-residential | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 91,081 388,831
Year Two 489,474 1,150,598
Year Three 1,103,713 821,373
Year Four 844,097 490,153
Year Five 421,053 404,061
Prior 2,052,324 1,718,776
Revolving Loans Amortized Cost Basis 571,030 536,349
Total 5,572,772 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 81 9,215
Year Four 8,667 1,145
Year Five 1,407 761
Prior 33,958 28,359
Revolving Loans Amortized Cost Basis 80 333
Total 44,193 39,813
Commercial real estate loans | Construction/land development    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 121,343 501,215
Year Two 505,026 926,208
Year Three 929,433 384,657
Year Four 336,539 88,901
Year Five 71,377 55,857
Prior 124,043 81,216
Revolving Loans Amortized Cost Basis 242,794 254,993
Total 2,330,555 2,293,047
Commercial real estate loans | Construction/land development | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 121,343 501,215
Year Two 505,026 918,390
Year Three 917,637 382,954
Year Four 334,866 88,204
Year Five 70,220 55,239
Prior 123,226 81,028
Revolving Loans Amortized Cost Basis 241,852 253,667
Total 2,314,170 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 0 7,818
Year Three 11,796 1,703
Year Four 1,673 697
Year Five 1,157 618
Prior 817 188
Revolving Loans Amortized Cost Basis 942 1,326
Total 16,385 12,350
Commercial real estate loans | Agricultural    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 20,686 39,976
Year Two 45,559 69,584
Year Three 67,502 46,888
Year Four 42,572 46,608
Year Five 38,750 20,485
Prior 90,938 76,899
Revolving Loans Amortized Cost Basis 31,611 24,716
Total 337,618 325,156
Commercial real estate loans | Agricultural | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 20,686 39,976
Year Two 45,559 69,584
Year Three 67,502 46,809
Year Four 42,501 46,608
Year Five 38,750 20,485
Prior 90,595 76,547
Revolving Loans Amortized Cost Basis 31,611 24,716
Total 337,204 324,725
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 71 0
Year Five 0 0
Prior 343 352
Revolving Loans Amortized Cost Basis 0 0
Total 414 431
Residential real estate loans | Residential 1-4 family    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 71,946 261,784
Year Two 239,035 409,197
Year Three 424,678 300,563
Year Four 294,679 171,122
Year Five 165,656 111,327
Prior 493,485 403,729
Revolving Loans Amortized Cost Basis 210,495 186,538
Total 1,899,974 1,844,260
Residential real estate loans | Residential 1-4 family | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 71,946 261,784
Year Two 238,505 405,239
Year Three 420,458 298,207
Year Four 291,510 167,475
Year Five 162,453 108,091
Prior 481,331 396,130
Revolving Loans Amortized Cost Basis 210,075 185,948
Total 1,876,278 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 530 3,958
Year Three 4,220 2,356
Year Four 3,169 3,647
Year Five 3,203 3,236
Prior 12,154 7,599
Revolving Loans Amortized Cost Basis 420 590
Total 23,696 21,386
Residential real estate loans | Multifamily residential    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 424 3,983
Year Two 3,996 87,012
Year Three 106,711 107,301
Year Four 75,459 108,702
Year Five 108,441 39,815
Prior 105,987 74,564
Revolving Loans Amortized Cost Basis 14,908 14,359
Total 415,926 435,736
Residential real estate loans | Multifamily residential | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 424 3,983
Year Two 3,996 87,012
Year Three 106,711 107,301
Year Four 75,459 108,702
Year Five 108,441 39,815
Prior 105,987 74,564
Revolving Loans Amortized Cost Basis 14,908 14,359
Total 415,926 435,736
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 0 0
Year Four 0 0
Year Five 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 0 0
Total 0 0
Total real estate    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 305,480 1,195,789
Year Two 1,283,090 2,642,599
Year Three 2,632,118 1,669,997
Year Four 1,602,013 906,631
Year Five 806,684 632,306
Prior 2,900,735 2,383,543
Revolving Loans Amortized Cost Basis 1,070,918 1,017,288
Total 10,601,038 10,448,153
Consumer    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 47,780 255,930
Year Two 247,337 257,588
Year Three 250,968 216,645
Year Four 210,945 109,981
Year Five 104,212 110,406
Prior 298,983 200,071
Revolving Loans Amortized Cost Basis 3,003 3,069
Total 1,163,228 1,153,690
Consumer | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 47,780 255,771
Year Two 247,223 256,826
Year Three 250,314 215,831
Year Four 210,065 109,442
Year Five 103,311 110,267
Prior 296,854 198,982
Revolving Loans Amortized Cost Basis 2,985 3,060
Total 1,158,532 1,150,179
Consumer | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 159
Year Two 114 762
Year Three 654 814
Year Four 880 539
Year Five 901 139
Prior 2,129 1,089
Revolving Loans Amortized Cost Basis 18 9
Total 4,696 3,511
Commercial and industrial    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 54,767 619,371
Year Two 540,127 385,376
Year Three 376,109 156,919
Year Four 140,432 88,094
Year Five 76,325 114,522
Prior 376,598 276,677
Revolving Loans Amortized Cost Basis 720,417 684,032
Total 2,284,775 2,324,991
Commercial and industrial | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 54,767 616,809
Year Two 537,330 382,190
Year Three 373,206 156,056
Year Four 139,722 87,531
Year Five 75,802 111,529
Prior 370,961 273,434
Revolving Loans Amortized Cost Basis 717,451 680,552
Total 2,269,239 2,308,101
Commercial and industrial | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 2,562
Year Two 2,797 3,186
Year Three 2,903 863
Year Four 710 563
Year Five 523 2,993
Prior 5,637 3,243
Revolving Loans Amortized Cost Basis 2,966 3,480
Total 15,536 16,890
Agricultural & other    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 22,274 67,640
Year Two 60,864 55,937
Year Three 51,407 39,483
Year Four 37,620 28,220
Year Five 26,321 15,195
Prior 60,623 48,237
Revolving Loans Amortized Cost Basis 205,523 243,182
Total 464,632 497,894
Agricultural & other | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 22,274 67,569
Year Two 60,787 55,904
Year Three 51,376 39,473
Year Four 37,565 28,220
Year Five 26,321 15,195
Prior 60,546 48,203
Revolving Loans Amortized Cost Basis 205,390 242,818
Total 464,259 497,382
Agricultural & other | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 71
Year Two 77 33
Year Three 31 10
Year Four 55 0
Year Five 0 0
Prior 77 34
Revolving Loans Amortized Cost Basis 133 364
Total $ 373 $ 512