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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
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One $ 2,197,674 $ 2,138,730
Year Two 2,138,138 3,341,500
Year Three 3,107,235 2,083,044
Year Four 1,554,947 1,132,926
Year Five 867,316 872,429
Prior 3,045,313 2,908,528
Revolving Loans Amortized Cost Basis 1,853,877 1,947,571
Total 14,764,500 14,424,728
Commercial real estate loans    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 1,350,313 930,022
Year Two 1,037,666 2,146,390
Year Three 1,947,209 1,262,133
Year Four 938,027 626,807
Year Five 443,400 481,164
Prior 1,920,283 1,905,250
Revolving Loans Amortized Cost Basis 863,089 816,391
Total 8,499,987 8,168,157
Commercial real estate loans | Non-farm/non-residential    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 333,198 388,831
Year Two 423,332 1,150,598
Year Three 1,212,296 830,588
Year Four 785,056 491,298
Year Five 363,710 404,822
Prior 1,767,050 1,747,135
Revolving Loans Amortized Cost Basis 542,138 536,682
Total 5,426,780 5,549,954
Commercial real estate loans | Non-farm/non-residential | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 301,127 388,831
Year Two 423,332 1,150,598
Year Three 1,178,297 821,373
Year Four 784,102 490,153
Year Five 359,710 404,061
Prior 1,712,213 1,718,776
Revolving Loans Amortized Cost Basis 542,138 536,349
Total 5,300,919 5,510,141
Commercial real estate loans | Non-farm/non-residential | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 32,071 0
Year Two 0 0
Year Three 33,999 9,215
Year Four 954 1,145
Year Five 4,000 761
Prior 54,837 28,359
Revolving Loans Amortized Cost Basis 0 333
Total 125,861 39,813
Commercial real estate loans | Construction/ Land Development    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 963,907 501,215
Year Two 571,039 926,208
Year Three 676,520 384,657
Year Four 115,480 88,901
Year Five 47,913 55,857
Prior 82,999 81,216
Revolving Loans Amortized Cost Basis 278,356 254,993
Total 2,736,214 2,293,047
Commercial real estate loans | Construction/ Land Development | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 963,903 501,215
Year Two 570,931 918,390
Year Three 674,668 382,954
Year Four 114,157 88,204
Year Five 47,736 55,239
Prior 82,199 81,028
Revolving Loans Amortized Cost Basis 278,319 253,667
Total 2,731,913 2,280,697
Commercial real estate loans | Construction/ Land Development | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 4 0
Year Two 108 7,818
Year Three 1,852 1,703
Year Four 1,323 697
Year Five 177 618
Prior 800 188
Revolving Loans Amortized Cost Basis 37 1,326
Total 4,301 12,350
Commercial real estate loans | Agricultural    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 53,208 39,976
Year Two 43,295 69,584
Year Three 58,393 46,888
Year Four 37,491 46,608
Year Five 31,777 20,485
Prior 70,234 76,899
Revolving Loans Amortized Cost Basis 42,595 24,716
Total 336,993 325,156
Commercial real estate loans | Agricultural | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 53,208 39,976
Year Two 43,295 69,584
Year Three 58,393 46,809
Year Four 37,491 46,608
Year Five 31,777 20,485
Prior 69,863 76,547
Revolving Loans Amortized Cost Basis 42,407 24,716
Total 336,434 324,725
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 0 0
Year Five 0 0
Prior 371 352
Revolving Loans Amortized Cost Basis 188 0
Total 559 431
Residential Real Estate | Residential 1-4 family    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 235,119 261,784
Year Two 255,492 409,197
Year Three 422,926 300,563
Year Four 250,947 171,122
Year Five 150,113 111,327
Prior 426,755 403,729
Revolving Loans Amortized Cost Basis 215,137 186,538
Total 1,956,489 1,844,260
Residential Real Estate | Residential 1-4 family | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 235,119 261,784
Year Two 252,691 405,239
Year Three 416,981 298,207
Year Four 247,959 167,475
Year Five 146,817 108,091
Prior 415,401 396,130
Revolving Loans Amortized Cost Basis 214,972 185,948
Total 1,929,940 1,822,874
Residential Real Estate | Residential 1-4 family | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 0
Year Two 2,801 3,958
Year Three 5,945 2,356
Year Four 2,988 3,647
Year Five 3,296 3,236
Prior 11,354 7,599
Revolving Loans Amortized Cost Basis 165 590
Total 26,549 21,386
Residential Real Estate | Multifamily residential    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 4,041 3,983
Year Two 11,699 87,012
Year Three 206,971 107,301
Year Four 49,322 108,702
Year Five 109,809 39,815
Prior 94,772 74,564
Revolving Loans Amortized Cost Basis 19,870 14,359
Total 496,484 435,736
Residential Real Estate | Multifamily residential | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 4,041 3,983
Year Two 11,699 87,012
Year Three 194,474 107,301
Year Four 48,736 108,702
Year Five 109,809 39,815
Prior 94,772 74,564
Revolving Loans Amortized Cost Basis 19,870 14,359
Total 483,401 435,736
Residential Real Estate | Multifamily residential | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 12,497 0
Year Four 586 0
Year Five 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 0 0
Total 13,083 0
Total real estate    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 1,589,473 1,195,789
Year Two 1,304,857 2,642,599
Year Three 2,577,106 1,669,997
Year Four 1,238,296 906,631
Year Five 703,322 632,306
Prior 2,441,810 2,383,543
Revolving Loans Amortized Cost Basis 1,098,096 1,017,288
Total 10,952,960 10,448,153
Consumer    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 281,031 255,930
Year Two 220,837 257,588
Year Three 216,978 216,645
Year Four 175,880 109,981
Year Five 88,720 110,406
Prior 247,924 200,071
Revolving Loans Amortized Cost Basis 2,991 3,069
Total 1,234,361 1,153,690
Consumer | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 280,956 255,771
Year Two 215,196 256,826
Year Three 214,938 215,831
Year Four 175,706 109,442
Year Five 88,409 110,267
Prior 241,992 198,982
Revolving Loans Amortized Cost Basis 2,936 3,060
Total 1,220,133 1,150,179
Consumer | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 75 159
Year Two 5,641 762
Year Three 2,040 814
Year Four 174 539
Year Five 311 139
Prior 5,932 1,089
Revolving Loans Amortized Cost Basis 55 9
Total 14,228 3,511
Commercial & Industrial    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 259,442 619,371
Year Two 566,916 385,376
Year Three 266,801 156,919
Year Four 107,310 88,094
Year Five 50,457 114,522
Prior 308,754 276,677
Revolving Loans Amortized Cost Basis 463,095 684,032
Total 2,022,775 2,324,991
Commercial & Industrial | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 212,469 616,809
Year Two 564,063 382,190
Year Three 263,604 156,056
Year Four 106,405 87,531
Year Five 50,453 111,529
Prior 300,351 273,434
Revolving Loans Amortized Cost Basis 443,008 680,552
Total 1,940,353 2,308,101
Commercial & Industrial | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 46,973 2,562
Year Two 2,853 3,186
Year Three 3,197 863
Year Four 905 563
Year Five 4 2,993
Prior 8,403 3,243
Revolving Loans Amortized Cost Basis 20,087 3,480
Total 82,422 16,890
Agricultural & other    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 67,728 67,640
Year Two 45,528 55,937
Year Three 46,350 39,483
Year Four 33,461 28,220
Year Five 24,817 15,195
Prior 46,825 48,237
Revolving Loans Amortized Cost Basis 289,695 243,182
Total 554,404 497,894
Agricultural & other | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 67,728 67,569
Year Two 45,525 55,904
Year Three 46,350 39,473
Year Four 33,422 28,220
Year Five 24,815 15,195
Prior 45,922 48,203
Revolving Loans Amortized Cost Basis 289,649 242,818
Total 553,411 497,382
Agricultural & other | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 71
Year Two 3 33
Year Three 0 10
Year Four 39 0
Year Five 2 0
Prior 903 34
Revolving Loans Amortized Cost Basis 46 364
Total $ 993 $ 512