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Allowance for Credit Losses, Credit Quality and Other - Summary of Aging Analysis for Loans Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | $ 14,764,500 | $ 14,424,728
Accruing Loans Past Due 90 Days or More | 5,034 | 4,130
Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 15,145 | 18,559
Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 46,050 | 5,947
Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 98,887 | 64,101
Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 160,082 | 88,607
Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 14,604,418 | 14,336,121
Commercial real estate loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 8,499,987 | 8,168,157
Commercial real estate loans | Non-farm/non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 5,426,780 | 5,549,954
Accruing Loans Past Due 90 Days or More | 304 | 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 receivable | 4,352 | 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 receivable | 38,944 | 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 receivable | 36,172 | 15,355
Commercial real estate loans | Non-farm/non-residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 79,468 | 23,895
Commercial real estate loans | Non-farm/non-residential | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 5,347,312 | 5,526,059
Commercial real estate loans | Construction/ Land Development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 2,736,214 | 2,293,047
Accruing Loans Past Due 90 Days or More | 600 | 255
Commercial real estate loans | Construction/ Land Development | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 369 | 1,430
Commercial real estate loans | Construction/ Land Development | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 799 | 0
Commercial real estate loans | Construction/ Land Development | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 4,302 | 12,349
Commercial real estate loans | Construction/ Land Development | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 5,470 | 13,779
Commercial real estate loans | Construction/ Land Development | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 2,730,744 | 2,279,268
Commercial real estate loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 336,993 | 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 receivable | 90 | 474
Commercial real estate loans | Agricultural | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 43 | 314
Commercial real estate loans | Agricultural | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 559 | 431
Commercial real estate loans | Agricultural | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 692 | 1,219
Commercial real estate loans | Agricultural | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 336,301 | 323,937
Residential Real Estate | Residential 1-4 family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,956,489 | 1,844,260
Accruing Loans Past Due 90 Days or More | 1,835 | 84
Residential Real Estate | Residential 1-4 family | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,897 | 4,346
Residential Real Estate | Residential 1-4 family | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 4,877 | 1,423
Residential Real Estate | Residential 1-4 family | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 24,374 | 20,435
Residential Real Estate | Residential 1-4 family | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 31,148 | 26,204
Residential Real Estate | Residential 1-4 family | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,925,341 | 1,818,056
Residential Real Estate | Multifamily residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 496,484 | 435,736
Accruing Loans Past Due 90 Days or More | 0 | 0
Residential Real Estate | Multifamily residential | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 0 | 0
Residential Real Estate | Multifamily residential | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 0 | 0
Residential Real Estate | Multifamily residential | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 13,083 | 0
Residential Real Estate | Multifamily residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 13,083 | 0
Residential Real Estate | Multifamily residential | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 483,401 | 435,736
Total real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 10,952,960 | 10,448,153
Accruing Loans Past Due 90 Days or More | 2,739 | 2,516
Total real estate | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 6,708 | 14,374
Total real estate | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 44,663 | 2,153
Total real estate | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 78,490 | 48,570
Total real estate | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 129,861 | 65,097
Total real estate | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 10,823,099 | 10,383,056
Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,234,361 | 1,153,690
Accruing Loans Past Due 90 Days or More | 32 | 79
Consumer | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 7,046 | 1,022
Consumer | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 68 | 303
Consumer | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 6,210 | 3,502
Consumer | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 13,324 | 4,827
Consumer | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,221,037 | 1,148,863
Commercial & Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 2,022,775 | 2,324,991
Accruing Loans Past Due 90 Days or More | 2,263 | 1,535
Commercial & Industrial | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 309 | 2,089
Commercial & Industrial | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,028 | 3,378
Commercial & Industrial | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 13,194 | 11,517
Commercial & Industrial | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 14,531 | 16,984
Commercial & Industrial | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 2,008,244 | 2,308,007
Agricultural & other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 554,404 | 497,894
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 receivable | 1,082 | 1,074
Agricultural & other | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 291 | 113
Agricultural & other | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 993 | 512
Agricultural & other | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 2,366 | 1,699
Agricultural & other | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | $ 552,038 | $ 496,195

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