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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
Jun. 30, 2025
Dec. 31, 2024
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One $ 1,062,597 $ 2,197,674
Year Two 2,355,336 2,138,138
Year Three 2,016,523 3,107,235
Year Four 2,857,254 1,554,947
Year Five 1,484,504 867,316
Prior 3,475,752 3,045,313
Revolving Loans Amortized Cost Basis 1,928,658 1,853,877
Total 15,180,624 14,764,500
Commercial real estate loans    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 556,346 1,350,313
Year Two 1,571,082 1,037,666
Year Three 818,343 1,947,209
Year Four 1,761,650 938,027
Year Five 848,212 443,400
Prior 2,056,620 1,920,283
Revolving Loans Amortized Cost Basis 952,416 863,089
Total 8,564,669 8,499,987
Commercial real estate loans | Non-farm/non-residential    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 228,940 333,198
Year Two 339,502 423,332
Year Three 424,743 1,212,296
Year Four 1,279,020 785,056
Year Five 752,889 363,710
Prior 1,876,709 1,767,050
Revolving Loans Amortized Cost Basis 651,379 542,138
Total 5,553,182 5,426,780
Commercial real estate loans | Non-farm/non-residential | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 228,940 301,127
Year Two 306,016 423,332
Year Three 423,918 1,178,297
Year Four 1,244,367 784,102
Year Five 750,513 359,710
Prior 1,836,302 1,712,213
Revolving Loans Amortized Cost Basis 651,369 542,138
Total 5,441,425 5,300,919
Commercial real estate loans | Non-farm/non-residential | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 32,071
Year Two 33,486 0
Year Three 825 33,999
Year Four 34,653 954
Year Five 2,376 4,000
Prior 40,407 54,837
Revolving Loans Amortized Cost Basis 10 0
Total 111,757 125,861
Commercial real estate loans | Construction/land development    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 306,637 963,907
Year Two 1,180,053 571,039
Year Three 363,425 676,520
Year Four 429,802 115,480
Year Five 61,224 47,913
Prior 94,742 82,999
Revolving Loans Amortized Cost Basis 259,678 278,356
Total 2,695,561 2,736,214
Commercial real estate loans | Construction/land development | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 306,637 963,903
Year Two 1,179,902 570,931
Year Three 363,047 674,668
Year Four 429,475 114,157
Year Five 61,039 47,736
Prior 94,055 82,199
Revolving Loans Amortized Cost Basis 259,644 278,319
Total 2,693,799 2,731,913
Commercial real estate loans | Construction/land development | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 4
Year Two 151 108
Year Three 378 1,852
Year Four 327 1,323
Year Five 185 177
Prior 687 800
Revolving Loans Amortized Cost Basis 34 37
Total 1,762 4,301
Commercial real estate loans | Agricultural    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 20,769 53,208
Year Two 51,527 43,295
Year Three 30,175 58,393
Year Four 52,828 37,491
Year Five 34,099 31,777
Prior 85,169 70,234
Revolving Loans Amortized Cost Basis 41,359 42,595
Total 315,926 336,993
Commercial real estate loans | Agricultural | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 20,769 53,208
Year Two 51,527 43,295
Year Three 30,175 58,393
Year Four 52,828 37,491
Year Five 34,099 31,777
Prior 84,829 69,863
Revolving Loans Amortized Cost Basis 41,180 42,407
Total 315,407 336,434
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 0
Year Four 0 0
Year Five 0 0
Prior 340 371
Revolving Loans Amortized Cost Basis 179 188
Total 519 559
Residential real estate loans | Residential 1-4 family    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 179,181 235,119
Year Two 217,445 255,492
Year Three 269,720 422,926
Year Four 439,400 250,947
Year Five 287,755 150,113
Prior 535,043 426,755
Revolving Loans Amortized Cost Basis 210,446 215,137
Total 2,138,990 1,956,489
Residential real estate loans | Residential 1-4 family | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 179,181 235,119
Year Two 216,506 252,691
Year Three 266,528 416,981
Year Four 433,532 247,959
Year Five 282,879 146,817
Prior 522,458 415,401
Revolving Loans Amortized Cost Basis 210,076 214,972
Total 2,111,160 1,929,940
Residential real estate loans | Residential 1-4 family | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 0
Year Two 939 2,801
Year Three 3,192 5,945
Year Four 5,868 2,988
Year Five 4,876 3,296
Prior 12,585 11,354
Revolving Loans Amortized Cost Basis 370 165
Total 27,830 26,549
Residential real estate loans | Multifamily residential    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 2,884 4,041
Year Two 19,479 11,699
Year Three 171,135 206,971
Year Four 199,489 49,322
Year Five 42,091 109,809
Prior 170,473 94,772
Revolving Loans Amortized Cost Basis 14,888 19,870
Total 620,439 496,484
Residential real estate loans | Multifamily residential | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 2,884 4,041
Year Two 19,479 11,699
Year Three 171,135 194,474
Year Four 187,467 48,736
Year Five 41,530 109,809
Prior 169,588 94,772
Revolving Loans Amortized Cost Basis 14,888 19,870
Total 606,971 483,401
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 12,497
Year Four 12,022 586
Year Five 561 0
Prior 885 0
Revolving Loans Amortized Cost Basis 0 0
Total 13,468 13,083
Total real estate    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 738,411 1,589,473
Year Two 1,808,006 1,304,857
Year Three 1,259,198 2,577,106
Year Four 2,400,539 1,238,296
Year Five 1,178,058 703,322
Prior 2,762,136 2,441,810
Revolving Loans Amortized Cost Basis 1,177,750 1,098,096
Total 11,324,098 10,952,960
Consumer    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 140,422 281,031
Year Two 260,563 220,837
Year Three 176,683 216,978
Year Four 178,235 175,880
Year Five 154,745 88,720
Prior 304,976 247,924
Revolving Loans Amortized Cost Basis 3,210 2,991
Total 1,218,834 1,234,361
Consumer | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 140,422 280,956
Year Two 259,557 215,196
Year Three 170,845 214,938
Year Four 175,699 175,706
Year Five 154,468 88,409
Prior 299,614 241,992
Revolving Loans Amortized Cost Basis 3,185 2,936
Total 1,203,790 1,220,133
Consumer | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 75
Year Two 1,006 5,641
Year Three 5,838 2,040
Year Four 2,536 174
Year Five 277 311
Prior 5,362 5,932
Revolving Loans Amortized Cost Basis 25 55
Total 15,044 14,228
Commercial and industrial    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 97,531 259,442
Year Two 239,124 566,916
Year Three 572,097 266,801
Year Four 236,934 107,310
Year Five 121,723 50,457
Prior 343,550 308,754
Revolving Loans Amortized Cost Basis 496,367 463,095
Total 2,107,326 2,022,775
Commercial and industrial | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 96,744 212,469
Year Two 193,118 564,063
Year Three 569,059 263,604
Year Four 236,422 106,405
Year Five 120,589 50,453
Prior 341,179 300,351
Revolving Loans Amortized Cost Basis 475,360 443,008
Total 2,032,471 1,940,353
Commercial and industrial | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 787 46,973
Year Two 46,006 2,853
Year Three 3,038 3,197
Year Four 512 905
Year Five 1,134 4
Prior 2,371 8,403
Revolving Loans Amortized Cost Basis 21,007 20,087
Total 74,855 82,422
Agricultural & other    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 86,233 67,728
Year Two 47,643 45,528
Year Three 8,545 46,350
Year Four 41,546 33,461
Year Five 29,978 24,817
Prior 65,090 46,825
Revolving Loans Amortized Cost Basis 251,331 289,695
Total 530,366 554,404
Agricultural & other | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 86,233 67,728
Year Two 47,643 45,525
Year Three 8,544 46,350
Year Four 41,234 33,422
Year Five 29,907 24,815
Prior 64,568 45,922
Revolving Loans Amortized Cost Basis 251,277 289,649
Total 529,406 553,411
Agricultural & other | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 0
Year Two 0 3
Year Three 1 0
Year Four 312 39
Year Five 71 2
Prior 522 903
Revolving Loans Amortized Cost Basis 54 46
Total $ 960 $ 993