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Allowance for Credit Losses, Credit Quality and Other - Summary of Amortized Cost of Performing and Nonperforming Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | $ 1,878,278 | $ 2,197,674
Year Two | 2,291,592 | 2,138,138
Year Three | 1,884,613 | 3,107,235
Year Four | 2,784,564 | 1,554,947
Year Five | 1,388,501 | 867,316
Prior | 3,301,680 | 3,045,313
Revolving Loans Amortized Cost Basis | 1,756,744 | 1,853,877
Total | 15,285,972 | 14,764,500
Commercial real estate loans |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 954,723 | 1,350,313
Year Two | 1,545,568 | 1,037,666
Year Three | 802,509 | 1,947,209
Year Four | 1,710,918 | 938,027
Year Five | 808,033 | 443,400
Prior | 1,952,571 | 1,920,283
Revolving Loans Amortized Cost Basis | 760,668 | 863,089
Total | 8,534,990 | 8,499,987
Commercial real estate loans | Non-farm/non-residential |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 436,046 | 333,198
Year Two | 366,675 | 423,332
Year Three | 425,112 | 1,212,296
Year Four | 1,263,247 | 785,056
Year Five | 718,661 | 363,710
Prior | 1,790,096 | 1,767,050
Revolving Loans Amortized Cost Basis | 494,655 | 542,138
Total | 5,494,492 | 5,426,780
Commercial real estate loans | Non-farm/non-residential | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 436,046 | 301,127
Year Two | 333,219 | 423,332
Year Three | 424,287 | 1,178,297
Year Four | 1,227,721 | 784,102
Year Five | 716,367 | 359,710
Prior | 1,763,193 | 1,712,213
Revolving Loans Amortized Cost Basis | 494,655 | 542,138
Total | 5,395,488 | 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 | 33,456 | 0
Year Three | 825 | 33,999
Year Four | 35,526 | 954
Year Five | 2,294 | 4,000
Prior | 26,903 | 54,837
Revolving Loans Amortized Cost Basis | 0 | 0
Total | 99,004 | 125,861
Commercial real estate loans | Construction/land development |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 484,119 | 963,907
Year Two | 1,129,174 | 571,039
Year Three | 348,468 | 676,520
Year Four | 396,850 | 115,480
Year Five | 55,330 | 47,913
Prior | 85,603 | 82,999
Revolving Loans Amortized Cost Basis | 209,653 | 278,356
Total | 2,709,197 | 2,736,214
Commercial real estate loans | Construction/land development | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 484,119 | 963,903
Year Two | 1,127,493 | 570,931
Year Three | 348,267 | 674,668
Year Four | 396,524 | 114,157
Year Five | 54,962 | 47,736
Prior | 84,761 | 82,199
Revolving Loans Amortized Cost Basis | 209,653 | 278,319
Total | 2,705,779 | 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 | 1,681 | 108
Year Three | 201 | 1,852
Year Four | 326 | 1,323
Year Five | 368 | 177
Prior | 842 | 800
Revolving Loans Amortized Cost Basis | 0 | 37
Total | 3,418 | 4,301
Commercial real estate loans | Agricultural |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 34,558 | 53,208
Year Two | 49,719 | 43,295
Year Three | 28,929 | 58,393
Year Four | 50,821 | 37,491
Year Five | 34,042 | 31,777
Prior | 76,872 | 70,234
Revolving Loans Amortized Cost Basis | 56,360 | 42,595
Total | 331,301 | 336,993
Commercial real estate loans | Agricultural | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 34,558 | 53,208
Year Two | 49,719 | 43,295
Year Three | 28,929 | 58,393
Year Four | 50,821 | 37,491
Year Five | 34,042 | 31,777
Prior | 76,548 | 69,863
Revolving Loans Amortized Cost Basis | 56,186 | 42,407
Total | 330,803 | 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 | 324 | 371
Revolving Loans Amortized Cost Basis | 174 | 188
Total | 498 | 559
Residential real estate loans | Residential 1-4 family |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 251,575 | 235,119
Year Two | 214,590 | 255,492
Year Three | 266,965 | 422,926
Year Four | 424,885 | 250,947
Year Five | 282,168 | 150,113
Prior | 505,973 | 426,755
Revolving Loans Amortized Cost Basis | 196,219 | 215,137
Total | 2,142,375 | 1,956,489
Residential real estate loans | Residential 1-4 family | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 251,575 | 235,119
Year Two | 213,176 | 252,691
Year Three | 262,457 | 416,981
Year Four | 419,241 | 247,959
Year Five | 276,722 | 146,817
Prior | 493,667 | 415,401
Revolving Loans Amortized Cost Basis | 195,864 | 214,972
Total | 2,112,702 | 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 | 1,414 | 2,801
Year Three | 4,508 | 5,945
Year Four | 5,644 | 2,988
Year Five | 5,446 | 3,296
Prior | 12,306 | 11,354
Revolving Loans Amortized Cost Basis | 355 | 165
Total | 29,673 | 26,549
Residential real estate loans | Multifamily residential |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 9,657 | 4,041
Year Two | 32,742 | 11,699
Year Three | 169,828 | 206,971
Year Four | 259,472 | 49,322
Year Five | 41,244 | 109,809
Prior | 167,400 | 94,772
Revolving Loans Amortized Cost Basis | 36,252 | 19,870
Total | 716,595 | 496,484
Residential real estate loans | Multifamily residential | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 9,657 | 4,041
Year Two | 32,742 | 11,699
Year Three | 169,828 | 194,474
Year Four | 247,450 | 48,736
Year Five | 41,244 | 109,809
Prior | 166,515 | 94,772
Revolving Loans Amortized Cost Basis | 36,252 | 19,870
Total | 703,688 | 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 | 12,022 | 586
Year Five | 0 | 0
Prior | 885 | 0
Revolving Loans Amortized Cost Basis | 0 | 0
Total | 12,907 | 13,083
Total real estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 1,215,955 | 1,589,473
Year Two | 1,792,900 | 1,304,857
Year Three | 1,239,302 | 2,577,106
Year Four | 2,395,275 | 1,238,296
Year Five | 1,131,445 | 703,322
Prior | 2,625,944 | 2,441,810
Revolving Loans Amortized Cost Basis | 993,139 | 1,098,096
Total | 11,393,960 | 10,952,960
Consumer |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 209,202 | 281,031
Year Two | 249,363 | 220,837
Year Three | 168,483 | 216,978
Year Four | 170,150 | 175,880
Year Five | 146,860 | 88,720
Prior | 286,303 | 247,924
Revolving Loans Amortized Cost Basis | 3,162 | 2,991
Total | 1,233,523 | 1,234,361
Consumer | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 209,169 | 280,956
Year Two | 248,356 | 215,196
Year Three | 162,674 | 214,938
Year Four | 168,196 | 175,706
Year Five | 146,813 | 88,409
Prior | 281,405 | 241,992
Revolving Loans Amortized Cost Basis | 3,158 | 2,936
Total | 1,219,771 | 1,220,133
Consumer | Non-performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 33 | 75
Year Two | 1,007 | 5,641
Year Three | 5,809 | 2,040
Year Four | 1,954 | 174
Year Five | 47 | 311
Prior | 4,898 | 5,932
Revolving Loans Amortized Cost Basis | 4 | 55
Total | 13,752 | 14,228
Commercial and industrial |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 348,989 | 259,442
Year Two | 208,161 | 566,916
Year Three | 470,236 | 266,801
Year Four | 178,820 | 107,310
Year Five | 81,137 | 50,457
Prior | 325,908 | 308,754
Revolving Loans Amortized Cost Basis | 487,017 | 463,095
Total | 2,100,268 | 2,022,775
Commercial and industrial | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 348,202 | 212,469
Year Two | 167,654 | 564,063
Year Three | 470,006 | 263,604
Year Four | 178,258 | 106,405
Year Five | 80,042 | 50,453
Prior | 323,742 | 300,351
Revolving Loans Amortized Cost Basis | 467,006 | 443,008
Total | 2,034,910 | 1,940,353
Commercial and industrial | Non-performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 787 | 46,973
Year Two | 40,507 | 2,853
Year Three | 230 | 3,197
Year Four | 562 | 905
Year Five | 1,095 | 4
Prior | 2,166 | 8,403
Revolving Loans Amortized Cost Basis | 20,011 | 20,087
Total | 65,358 | 82,422
Agricultural & other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 104,132 | 67,728
Year Two | 41,168 | 45,528
Year Three | 6,592 | 46,350
Year Four | 40,319 | 33,461
Year Five | 29,059 | 24,817
Prior | 63,525 | 46,825
Revolving Loans Amortized Cost Basis | 273,426 | 289,695
Total | 558,221 | 554,404
Agricultural & other | Performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 104,132 | 67,728
Year Two | 40,996 | 45,525
Year Three | 6,483 | 46,350
Year Four | 40,007 | 33,422
Year Five | 29,009 | 24,815
Prior | 62,975 | 45,922
Revolving Loans Amortized Cost Basis | 273,349 | 289,649
Total | 556,951 | 553,411
Agricultural & other | Non-performing |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Year One | 0 | 0
Year Two | 172 | 3
Year Three | 109 | 0
Year Four | 312 | 39
Year Five | 50 | 2
Prior | 550 | 903
Revolving Loans Amortized Cost Basis | 77 | 46
Total | $ 1,270 | $ 993

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