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Allowance for Credit Losses, Credit Quality and Other - Summary of Aging Analysis for Loans Receivable (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | $ 14,513,673 | $ 14,424,728
Accruing Loans Past Due 90 Days or More | 12,928 | 4,130
Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 18,037 | 18,559
Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,974 | 5,947
Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 79,983 | 64,101
Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 103,994 | 88,607
Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 14,409,679 | 14,336,121
Commercial real estate loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 8,285,138 | 8,168,157
Commercial real estate loans | Non-farm/non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,616,965 | 5,549,954
Accruing Loans Past Due 90 Days or More | 9,377 | 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 | 2,628 | 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 | 1,148 | 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 | 22,264 | 15,355
Commercial real estate loans | Non-farm/non-residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 26,040 | 23,895
Commercial real estate loans | Non-farm/non-residential | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,590,925 | 5,526,059
Commercial real estate loans | Construction/land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,330,555 | 2,293,047
Accruing Loans Past Due 90 Days or More | 603 | 255
Commercial real estate loans | Construction/land development | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,525 | 1,430
Commercial real estate loans | Construction/land development | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 103 | 0
Commercial real estate loans | Construction/land development | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 16,385 | 12,349
Commercial real estate loans | Construction/land development | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 18,013 | 13,779
Commercial real estate loans | Construction/land development | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,312,542 | 2,279,268
Commercial real estate loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 337,618 | 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 | 301 | 474
Commercial real estate loans | Agricultural | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 311 | 314
Commercial real estate loans | Agricultural | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 414 | 431
Commercial real estate loans | Agricultural | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,026 | 1,219
Commercial real estate loans | Agricultural | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 336,592 | 323,937
Residential real estate loans | Residential 1-4 family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,899,974 | 1,844,260
Accruing Loans Past Due 90 Days or More | 543 | 84
Residential real estate loans | Residential 1-4 family | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 10,488 | 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 | 1,466 | 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 | 22,580 | 20,435
Residential real estate loans | Residential 1-4 family | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 34,534 | 26,204
Residential real estate loans | Residential 1-4 family | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,865,440 | 1,818,056
Residential real estate loans | Multifamily residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 415,926 | 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 | 790 | 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 | 0 | 0
Residential real estate loans | Multifamily residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 790 | 0
Residential real estate loans | Multifamily residential | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 415,136 | 435,736
Total real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 10,601,038 | 10,448,153
Accruing Loans Past Due 90 Days or More | 10,523 | 2,516
Total real estate | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 15,732 | 14,374
Total real estate | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 3,028 | 2,153
Total real estate | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 61,643 | 48,570
Total real estate | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 80,403 | 65,097
Total real estate | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 10,520,635 | 10,383,056
Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,163,228 | 1,153,690
Accruing Loans Past Due 90 Days or More | 48 | 79
Consumer | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 417 | 1,022
Consumer | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 151 | 303
Consumer | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 4,687 | 3,502
Consumer | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,255 | 4,827
Consumer | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,157,973 | 1,148,863
Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,284,775 | 2,324,991
Accruing Loans Past Due 90 Days or More | 2,311 | 1,535
Commercial and industrial | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,426 | 2,089
Commercial and industrial | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,747 | 3,378
Commercial and industrial | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 13,280 | 11,517
Commercial and industrial | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 17,453 | 16,984
Commercial and industrial | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,267,322 | 2,308,007
Agricultural & other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 464,632 | 497,894
Accruing Loans Past Due 90 Days or More | 46 | 0
Agricultural & other | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 462 | 1,074
Agricultural & other | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 48 | 113
Agricultural & other | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 373 | 512
Agricultural & other | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 883 | 1,699
Agricultural & other | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | $ 463,749 | $ 496,195

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