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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
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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

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