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Allowance for Credit Losses, Credit Quality and Other - Summary of Aging Analysis for Loans Receivable (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | $ 15,180,624 | $ 14,764,500
Accruing Loans Past Due 90 Days or More | 7,031 | 5,034
Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 17,174 | 15,145
Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 12,329 | 46,050
Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 96,292 | 98,887
Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 125,795 | 160,082
Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 15,054,829 | 14,604,418
Commercial real estate loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 8,564,669 | 8,499,987
Commercial real estate loans | Non-farm/non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,553,182 | 5,426,780
Accruing Loans Past Due 90 Days or More | 1,657 | 304
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,836 | 4,352
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,760 | 38,944
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 35,974 | 36,172
Commercial real estate loans | Non-farm/non-residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 40,570 | 79,468
Commercial real estate loans | Non-farm/non-residential | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,512,612 | 5,347,312
Commercial real estate loans | Construction/land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,695,561 | 2,736,214
Accruing Loans Past Due 90 Days or More | 209 | 600
Commercial real estate loans | Construction/land development | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,745 | 369
Commercial real estate loans | Construction/land development | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 393 | 799
Commercial real estate loans | Construction/land development | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,762 | 4,302
Commercial real estate loans | Construction/land development | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 3,900 | 5,470
Commercial real estate loans | Construction/land development | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,691,661 | 2,730,744
Commercial real estate loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 315,926 | 336,993
Accruing Loans Past Due 90 Days or More | 0 | 0
Commercial real estate loans | Agricultural | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 124 | 90
Commercial real estate loans | Agricultural | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 0 | 43
Commercial real estate loans | Agricultural | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 519 | 559
Commercial real estate loans | Agricultural | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 643 | 692
Commercial real estate loans | Agricultural | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 315,283 | 336,301
Residential real estate loans | Residential 1-4 family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,138,990 | 1,956,489
Accruing Loans Past Due 90 Days or More | 3,459 | 1,835
Residential real estate loans | Residential 1-4 family | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,199 | 1,897
Residential real estate loans | Residential 1-4 family | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 6,852 | 4,877
Residential real estate loans | Residential 1-4 family | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 25,831 | 24,374
Residential real estate loans | Residential 1-4 family | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 34,882 | 31,148
Residential real estate loans | Residential 1-4 family | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,104,108 | 1,925,341
Residential real estate loans | Multifamily residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 620,439 | 496,484
Accruing Loans Past Due 90 Days or More | 0 | 0
Residential real estate loans | Multifamily residential | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 0 | 0
Residential real estate loans | Multifamily residential | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 0 | 0
Residential real estate loans | Multifamily residential | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 13,468 | 13,083
Residential real estate loans | Multifamily residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 13,468 | 13,083
Residential real estate loans | Multifamily residential | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 606,971 | 483,401
Total real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 11,324,098 | 10,952,960
Accruing Loans Past Due 90 Days or More | 5,325 | 2,739
Total real estate | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,904 | 6,708
Total real estate | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 10,005 | 44,663
Total real estate | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 77,554 | 78,490
Total real estate | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 93,463 | 129,861
Total real estate | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 11,230,635 | 10,823,099
Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,218,834 | 1,234,361
Accruing Loans Past Due 90 Days or More | 34 | 32
Consumer | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,725 | 7,046
Consumer | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 22 | 68
Consumer | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 12,076 | 6,210
Consumer | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 14,823 | 13,324
Consumer | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,204,011 | 1,221,037
Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,107,326 | 2,022,775
Accruing Loans Past Due 90 Days or More | 1,672 | 2,263
Commercial and industrial | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 7,186 | 309
Commercial and industrial | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,558 | 1,028
Commercial and industrial | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,702 | 13,194
Commercial and industrial | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 14,446 | 14,531
Commercial and industrial | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,092,880 | 2,008,244
Agricultural & other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 530,366 | 554,404
Accruing Loans Past Due 90 Days or More | 0 | 0
Agricultural & other | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,359 | 1,082
Agricultural & other | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 744 | 291
Agricultural & other | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 960 | 993
Agricultural & other | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 3,063 | 2,366
Agricultural & other | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | $ 527,303 | $ 552,038

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