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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, 2023 | Dec. 31, 2022
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Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | $ 2,138,730 | $ 3,262,317
2021 | 3,341,500 | 2,757,885
2020 | 2,083,044 | 1,525,752
2019 | 1,132,926 | 1,139,754
2018 | 872,429 | 1,172,612
Prior | 2,908,528 | 2,565,074
Revolving Loans Amortized Cost Basis | 1,947,571 | 1,986,086
Total | 14,424,728 | 14,409,480
Commercial real estate loans |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 930,022 | 1,916,645
2021 | 2,146,390 | 1,719,653
2020 | 1,262,133 | 742,859
2019 | 626,807 | 641,813
2018 | 481,164 | 727,802
Prior | 1,905,250 | 1,698,912
Revolving Loans Amortized Cost Basis | 816,391 | 666,456
Total | 8,168,157 | 8,114,140
Commercial real estate loans | Non-farm/non-residential |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 388,831 | 1,056,381
2021 | 1,150,598 | 851,269
2020 | 830,588 | 514,249
2019 | 491,298 | 481,999
2018 | 404,822 | 683,459
Prior | 1,747,135 | 1,530,758
Revolving Loans Amortized Cost Basis | 536,682 | 513,948
Total | 5,549,954 | 5,632,063
Commercial real estate loans | Non-farm/non-residential | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 388,831 | 1,056,381
2021 | 1,150,598 | 851,269
2020 | 821,373 | 509,258
2019 | 490,153 | 456,196
2018 | 404,061 | 679,187
Prior | 1,718,776 | 1,403,874
Revolving Loans Amortized Cost Basis | 536,349 | 513,630
Total | 5,510,141 | 5,469,795
Commercial real estate loans | Non-farm/non-residential | Non-performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 0 | 0
2021 | 0 | 0
2020 | 9,215 | 4,991
2019 | 1,145 | 25,803
2018 | 761 | 4,272
Prior | 28,359 | 126,884
Revolving Loans Amortized Cost Basis | 333 | 318
Total | 39,813 | 162,268
Commercial real estate loans | Construction/ Land Development |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 501,215 | 777,920
2021 | 926,208 | 796,098
2020 | 384,657 | 173,560
2019 | 88,901 | 129,335
2018 | 55,857 | 30,863
Prior | 81,216 | 85,733
Revolving Loans Amortized Cost Basis | 254,993 | 141,757
Total | 2,293,047 | 2,135,266
Commercial real estate loans | Construction/ Land Development | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 501,215 | 777,309
2021 | 918,390 | 796,098
2020 | 382,954 | 172,987
2019 | 88,204 | 128,736
2018 | 55,239 | 30,860
Prior | 81,028 | 85,511
Revolving Loans Amortized Cost Basis | 253,667 | 141,757
Total | 2,280,697 | 2,133,258
Commercial real estate loans | Construction/ Land Development | Non-performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 0 | 611
2021 | 7,818 | 0
2020 | 1,703 | 573
2019 | 697 | 599
2018 | 618 | 3
Prior | 188 | 222
Revolving Loans Amortized Cost Basis | 1,326 | 0
Total | 12,350 | 2,008
Commercial real estate loans | Agricultural |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 39,976 | 82,344
2021 | 69,584 | 72,286
2020 | 46,888 | 55,050
2019 | 46,608 | 30,479
2018 | 20,485 | 13,480
Prior | 76,899 | 82,421
Revolving Loans Amortized Cost Basis | 24,716 | 10,751
Total | 325,156 | 346,811
Commercial real estate loans | Agricultural | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 39,976 | 82,344
2021 | 69,584 | 72,286
2020 | 46,809 | 55,050
2019 | 46,608 | 30,479
2018 | 20,485 | 13,480
Prior | 76,547 | 82,143
Revolving Loans Amortized Cost Basis | 24,716 | 10,751
Total | 324,725 | 346,533
Commercial real estate loans | Agricultural | Non-performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 0 | 0
2021 | 0 | 0
2020 | 79 | 0
2019 | 0 | 0
2018 | 0 | 0
Prior | 352 | 278
Revolving Loans Amortized Cost Basis | 0 | 0
Total | 431 | 278
Residential Real Estate | Residential 1-4 family |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 261,784 | 398,830
2021 | 409,197 | 294,073
2020 | 300,563 | 241,937
2019 | 171,122 | 130,494
2018 | 111,327 | 116,432
Prior | 403,729 | 388,680
Revolving Loans Amortized Cost Basis | 186,538 | 178,105
Total | 1,844,260 | 1,748,551
Residential Real Estate | Residential 1-4 family | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 261,784 | 397,464
2021 | 405,239 | 292,100
2020 | 298,207 | 239,047
2019 | 167,475 | 127,250
2018 | 108,091 | 114,337
Prior | 396,130 | 380,210
Revolving Loans Amortized Cost Basis | 185,948 | 177,311
Total | 1,822,874 | 1,727,719
Residential Real Estate | Residential 1-4 family | Non-performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 0 | 1,366
2021 | 3,958 | 1,973
2020 | 2,356 | 2,890
2019 | 3,647 | 3,244
2018 | 3,236 | 2,095
Prior | 7,599 | 8,470
Revolving Loans Amortized Cost Basis | 590 | 794
Total | 21,386 | 20,832
Residential Real Estate | Multifamily residential |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 3,983 | 82,308
2021 | 87,012 | 138,848
2020 | 107,301 | 196,977
2019 | 108,702 | 42,399
2018 | 39,815 | 28,174
Prior | 74,564 | 81,611
Revolving Loans Amortized Cost Basis | 14,359 | 7,735
Total | 435,736 | 578,052
Residential Real Estate | Multifamily residential | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 3,983 | 82,308
2021 | 87,012 | 138,848
2020 | 107,301 | 196,977
2019 | 108,702 | 42,399
2018 | 39,815 | 28,174
Prior | 74,564 | 80,642
Revolving Loans Amortized Cost Basis | 14,359 | 7,735
Total | 435,736 | 577,083
Residential Real Estate | Multifamily residential | Non-performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
2018 | 0 | 0
Prior | 0 | 969
Revolving Loans Amortized Cost Basis | 0 | 0
Total | 0 | 969
Total real estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 1,195,789 | 2,397,783
2021 | 2,642,599 | 2,152,574
2020 | 1,669,997 | 1,181,773
2019 | 906,631 | 814,706
2018 | 632,306 | 872,408
Prior | 2,383,543 | 2,169,203
Revolving Loans Amortized Cost Basis | 1,017,288 | 852,296
Total | 10,448,153 | 10,440,743
Consumer |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 255,930 | 305,684
2021 | 257,588 | 283,078
2020 | 216,645 | 148,102
2019 | 109,981 | 135,779
2018 | 110,406 | 119,901
Prior | 200,071 | 139,622
Revolving Loans Amortized Cost Basis | 3,069 | 17,730
Total | 1,153,690 | 1,149,896
Consumer | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 255,771 | 305,620
2021 | 256,826 | 282,944
2020 | 215,831 | 147,820
2019 | 109,442 | 134,831
2018 | 110,267 | 119,877
Prior | 198,982 | 138,288
Revolving Loans Amortized Cost Basis | 3,060 | 17,628
Total | 1,150,179 | 1,147,008
Consumer | Non-performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 159 | 64
2021 | 762 | 134
2020 | 814 | 282
2019 | 539 | 948
2018 | 139 | 24
Prior | 1,089 | 1,334
Revolving Loans Amortized Cost Basis | 9 | 102
Total | 3,511 | 2,888
Commercial & Industrial |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 619,371 | 465,079
2021 | 385,376 | 272,228
2020 | 156,919 | 162,257
2019 | 88,094 | 169,398
2018 | 114,522 | 170,269
Prior | 276,677 | 198,983
Revolving Loans Amortized Cost Basis | 684,032 | 911,049
Total | 2,324,991 | 2,349,263
Commercial & Industrial | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 616,809 | 464,285
2021 | 382,190 | 267,719
2020 | 156,056 | 159,152
2019 | 87,531 | 165,733
2018 | 111,529 | 160,267
Prior | 273,434 | 194,162
Revolving Loans Amortized Cost Basis | 680,552 | 907,611
Total | 2,308,101 | 2,318,929
Commercial & Industrial | Non-performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 2,562 | 794
2021 | 3,186 | 4,509
2020 | 863 | 3,105
2019 | 563 | 3,665
2018 | 2,993 | 10,002
Prior | 3,243 | 4,821
Revolving Loans Amortized Cost Basis | 3,480 | 3,438
Total | 16,890 | 30,334
Agricultural & other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 67,640 | 93,771
2021 | 55,937 | 50,005
2020 | 39,483 | 33,620
2019 | 28,220 | 19,871
2018 | 15,195 | 10,034
Prior | 48,237 | 57,266
Revolving Loans Amortized Cost Basis | 243,182 | 205,011
Total | 497,894 | 469,578
Agricultural & other | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 67,569 | 93,771
2021 | 55,904 | 50,001
2020 | 39,473 | 33,416
2019 | 28,220 | 19,818
2018 | 15,195 | 10,034
Prior | 48,203 | 56,631
Revolving Loans Amortized Cost Basis | 242,818 | 204,380
Total | 497,382 | 468,051
Agricultural & other | Non-performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
2022 | 71 | 0
2021 | 33 | 4
2020 | 10 | 204
2019 | 0 | 53
2018 | 0 | 0
Prior | 34 | 635
Revolving Loans Amortized Cost Basis | 364 | 631
Total | $ 512 | $ 1,527

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