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Allowance for Credit Losses, Credit Quality and Other - Summary of Aging Analysis for Loans Receivable (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | $ 14,823,979 | $ 14,424,728
Accruing Loans Past Due 90 Days or More | 5,356 | 4,130
Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 33,696 | 18,559
Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 8,767 | 5,947
Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 101,103 | 64,101
Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 143,566 | 88,607
Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 14,680,413 | 14,336,121
Commercial real estate loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 8,573,920 | 8,168,157
Commercial real estate loans | Non-farm/non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,496,536 | 5,549,954
Accruing Loans Past Due 90 Days or More | 709 | 2,177
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 4,391 | 8,124
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 837 | 416
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 48,795 | 15,355
Commercial real estate loans | Non-farm/non-residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 54,023 | 23,895
Commercial real estate loans | Non-farm/non-residential | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,442,513 | 5,526,059
Commercial real estate loans | Construction/land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,741,419 | 2,293,047
Accruing Loans Past Due 90 Days or More | 657 | 255
Commercial real estate loans | Construction/land development | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 778 | 1,430
Commercial real estate loans | Construction/land development | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 221 | 0
Commercial real estate loans | Construction/land development | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 6,060 | 12,349
Commercial real estate loans | Construction/land development | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 7,059 | 13,779
Commercial real estate loans | Construction/land development | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,734,360 | 2,279,268
Commercial real estate loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 335,965 | 325,156
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 | 177 | 474
Commercial real estate loans | Agricultural | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 198 | 314
Commercial real estate loans | Agricultural | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 737 | 431
Commercial real estate loans | Agricultural | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,112 | 1,219
Commercial real estate loans | Agricultural | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 334,853 | 323,937
Residential real estate loans | Residential 1-4 family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,932,352 | 1,844,260
Accruing Loans Past Due 90 Days or More | 1,495 | 84
Residential real estate loans | Residential 1-4 family | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,329 | 4,346
Residential real estate loans | Residential 1-4 family | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 6,698 | 1,423
Residential real estate loans | Residential 1-4 family | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 25,400 | 20,435
Residential real estate loans | Residential 1-4 family | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 34,427 | 26,204
Residential real estate loans | Residential 1-4 family | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,897,925 | 1,818,056
Residential real estate loans | Multifamily residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 482,648 | 435,736
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 | 20,902 | 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 | 592 | 0
Residential real estate loans | Multifamily residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 21,494 | 0
Residential real estate loans | Multifamily residential | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 461,154 | 435,736
Total real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 10,988,920 | 10,448,153
Accruing Loans Past Due 90 Days or More | 2,861 | 2,516
Total real estate | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 28,577 | 14,374
Total real estate | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 7,954 | 2,153
Total real estate | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 81,584 | 48,570
Total real estate | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 118,115 | 65,097
Total real estate | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 10,870,805 | 10,383,056
Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,219,197 | 1,153,690
Accruing Loans Past Due 90 Days or More | 28 | 79
Consumer | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,928 | 1,022
Consumer | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 155 | 303
Consumer | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 7,529 | 3,502
Consumer | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 10,612 | 4,827
Consumer | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,208,585 | 1,148,863
Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,084,667 | 2,324,991
Accruing Loans Past Due 90 Days or More | 2,405 | 1,535
Commercial and industrial | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,071 | 2,089
Commercial and industrial | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 567 | 3,378
Commercial and industrial | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 10,916 | 11,517
Commercial and industrial | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 12,554 | 16,984
Commercial and industrial | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,072,113 | 2,308,007
Agricultural & other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 531,195 | 497,894
Accruing Loans Past Due 90 Days or More | 62 | 0
Agricultural & other | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,120 | 1,074
Agricultural & other | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 91 | 113
Agricultural & other | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,074 | 512
Agricultural & other | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,285 | 1,699
Agricultural & other | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | $ 528,910 | $ 496,195

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