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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, 2025
Dec. 31, 2024
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One $ 505,726 $ 2,197,674
Year Two 2,253,336 2,138,138
Year Three 2,124,903 3,107,235
Year Four 3,012,491 1,554,947
Year Five 1,509,654 867,316
Prior 3,735,293 3,045,313
Revolving Loans Amortized Cost Basis 1,810,713 1,853,877
Total 14,952,116 14,764,500
Commercial real estate loans    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 245,860 1,350,313
Year Two 1,481,662 1,037,666
Year Three 977,676 1,947,209
Year Four 1,896,359 938,027
Year Five 915,135 443,400
Prior 2,231,855 1,920,283
Revolving Loans Amortized Cost Basis 911,331 863,089
Total 8,659,878 8,499,987
Commercial real estate loans | Non-farm/non-residential    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 116,031 333,198
Year Two 309,054 423,332
Year Three 478,267 1,212,296
Year Four 1,287,823 785,056
Year Five 765,133 363,710
Prior 2,022,757 1,767,050
Revolving Loans Amortized Cost Basis 609,616 542,138
Total 5,588,681 5,426,780
Commercial real estate loans | Non-farm/non-residential | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 116,031 301,127
Year Two 277,146 423,332
Year Three 477,442 1,178,297
Year Four 1,253,353 784,102
Year Five 762,756 359,710
Prior 1,983,193 1,712,213
Revolving Loans Amortized Cost Basis 609,616 542,138
Total 5,479,537 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 31,908 0
Year Three 825 33,999
Year Four 34,470 954
Year Five 2,377 4,000
Prior 39,564 54,837
Revolving Loans Amortized Cost Basis 0 0
Total 109,144 125,861
Commercial real estate loans | Construction/land development    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 116,017 963,907
Year Two 1,119,198 571,039
Year Three 456,617 676,520
Year Four 554,247 115,480
Year Five 113,961 47,913
Prior 115,941 82,999
Revolving Loans Amortized Cost Basis 259,779 278,356
Total 2,735,760 2,736,214
Commercial real estate loans | Construction/land development | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 116,017 963,903
Year Two 1,119,138 570,931
Year Three 456,509 674,668
Year Four 554,019 114,157
Year Five 113,237 47,736
Prior 115,036 82,199
Revolving Loans Amortized Cost Basis 259,743 278,319
Total 2,733,699 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 60 108
Year Three 108 1,852
Year Four 228 1,323
Year Five 724 177
Prior 905 800
Revolving Loans Amortized Cost Basis 36 37
Total 2,061 4,301
Commercial real estate loans | Agricultural    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 13,812 53,208
Year Two 53,410 43,295
Year Three 42,792 58,393
Year Four 54,289 37,491
Year Five 36,041 31,777
Prior 93,157 70,234
Revolving Loans Amortized Cost Basis 41,936 42,595
Total 335,437 336,993
Commercial real estate loans | Agricultural | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 13,812 53,208
Year Two 53,410 43,295
Year Three 42,792 58,393
Year Four 54,289 37,491
Year Five 36,041 31,777
Prior 92,803 69,863
Revolving Loans Amortized Cost Basis 41,752 42,407
Total 334,899 336,434
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 354 371
Revolving Loans Amortized Cost Basis 184 188
Total 538 559
Residential real estate loans | Residential 1-4 family    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 57,864 235,119
Year Two 198,421 255,492
Year Three 259,235 422,926
Year Four 420,531 250,947
Year Five 244,440 150,113
Prior 552,619 426,755
Revolving Loans Amortized Cost Basis 214,762 215,137
Total 1,947,872 1,956,489
Residential real estate loans | Residential 1-4 family | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 57,864 235,119
Year Two 197,574 252,691
Year Three 256,092 416,981
Year Four 414,677 247,959
Year Five 241,331 146,817
Prior 539,699 415,401
Revolving Loans Amortized Cost Basis 214,653 214,972
Total 1,921,890 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 847 2,801
Year Three 3,143 5,945
Year Four 5,854 2,988
Year Five 3,109 3,296
Prior 12,920 11,354
Revolving Loans Amortized Cost Basis 109 165
Total 25,982 26,549
Residential real estate loans | Multifamily residential    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 1,604 4,041
Year Two 3,045 11,699
Year Three 92,588 206,971
Year Four 210,457 49,322
Year Five 48,717 109,809
Prior 201,221 94,772
Revolving Loans Amortized Cost Basis 18,457 19,870
Total 576,089 496,484
Residential real estate loans | Multifamily residential | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 1,604 4,041
Year Two 3,045 11,699
Year Three 92,588 194,474
Year Four 197,961 48,736
Year Five 48,139 109,809
Prior 201,221 94,772
Revolving Loans Amortized Cost Basis 18,457 19,870
Total 563,015 483,401
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 12,496 586
Year Five 578 0
Prior 0 0
Revolving Loans Amortized Cost Basis 0 0
Total 13,074 13,083
Total real estate    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 305,328 1,589,473
Year Two 1,683,128 1,304,857
Year Three 1,329,499 2,577,106
Year Four 2,527,347 1,238,296
Year Five 1,208,292 703,322
Prior 2,985,695 2,441,810
Revolving Loans Amortized Cost Basis 1,144,550 1,098,096
Total 11,183,839 10,952,960
Consumer    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 77,199 281,031
Year Two 272,006 220,837
Year Three 199,157 216,978
Year Four 188,748 175,880
Year Five 163,382 88,720
Prior 324,128 247,924
Revolving Loans Amortized Cost Basis 3,125 2,991
Total 1,227,745 1,234,361
Consumer | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 77,199 280,956
Year Two 271,981 215,196
Year Three 193,548 214,938
Year Four 186,651 175,706
Year Five 163,269 88,409
Prior 317,981 241,992
Revolving Loans Amortized Cost Basis 3,119 2,936
Total 1,213,748 1,220,133
Consumer | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 75
Year Two 25 5,641
Year Three 5,609 2,040
Year Four 2,097 174
Year Five 113 311
Prior 6,147 5,932
Revolving Loans Amortized Cost Basis 6 55
Total 13,997 14,228
Commercial and industrial    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 66,098 259,442
Year Two 242,620 566,916
Year Three 580,228 266,801
Year Four 253,629 107,310
Year Five 106,886 50,457
Prior 357,509 308,754
Revolving Loans Amortized Cost Basis 438,066 463,095
Total 2,045,036 2,022,775
Commercial and industrial | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 66,098 212,469
Year Two 196,112 564,063
Year Three 577,322 263,604
Year Four 249,938 106,405
Year Five 105,277 50,453
Prior 354,022 300,351
Revolving Loans Amortized Cost Basis 420,956 443,008
Total 1,969,725 1,940,353
Commercial and industrial | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 46,973
Year Two 46,508 2,853
Year Three 2,906 3,197
Year Four 3,691 905
Year Five 1,609 4
Prior 3,487 8,403
Revolving Loans Amortized Cost Basis 17,110 20,087
Total 75,311 82,422
Agricultural & other    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 57,101 67,728
Year Two 55,582 45,528
Year Three 16,019 46,350
Year Four 42,767 33,461
Year Five 31,094 24,817
Prior 67,961 46,825
Revolving Loans Amortized Cost Basis 224,972 289,695
Total 495,496 554,404
Agricultural & other | Performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 57,101 67,728
Year Two 55,582 45,525
Year Three 16,016 46,350
Year Four 42,455 33,422
Year Five 31,055 24,815
Prior 67,409 45,922
Revolving Loans Amortized Cost Basis 224,925 289,649
Total 494,543 553,411
Agricultural & other | Non-performing    
Financing Receivable Allowance For Credit Losses [Line Items]    
Year One 0 0
Year Two 0 3
Year Three 3 0
Year Four 312 39
Year Five 39 2
Prior 552 903
Revolving Loans Amortized Cost Basis 47 46
Total $ 953 $ 993