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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

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