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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, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | $ 14,952,116 | $ 14,764,500
Accruing Loans Past Due 90 Days or More | 3,264 | 5,034
Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 23,029 | 15,145
Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 6,860 | 46,050
Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 89,647 | 98,887
Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 119,536 | 160,082
Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 14,832,580 | 14,604,418
Commercial real estate loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 8,659,878 | 8,499,987
Commercial real estate loans | Non-farm/non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,588,681 | 5,426,780
Accruing Loans Past Due 90 Days or More | 226 | 304
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,346 | 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 | 2,018 | 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 | 33,179 | 36,172
Commercial real estate loans | Non-farm/non-residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 37,543 | 79,468
Commercial real estate loans | Non-farm/non-residential | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 5,551,138 | 5,347,312
Commercial real estate loans | Construction/land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,735,760 | 2,736,214
Accruing Loans Past Due 90 Days or More | 0 | 600
Commercial real estate loans | Construction/land development | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,259 | 369
Commercial real estate loans | Construction/land development | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 16 | 799
Commercial real estate loans | Construction/land development | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,061 | 4,302
Commercial real estate loans | Construction/land development | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 4,336 | 5,470
Commercial real estate loans | Construction/land development | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,731,424 | 2,730,744
Commercial real estate loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 335,437 | 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 | 39 | 90
Commercial real estate loans | Agricultural | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 21 | 43
Commercial real estate loans | Agricultural | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 538 | 559
Commercial real estate loans | Agricultural | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 598 | 692
Commercial real estate loans | Agricultural | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 334,839 | 336,301
Residential real estate loans | Residential 1-4 family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,947,872 | 1,956,489
Accruing Loans Past Due 90 Days or More | 306 | 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 | 8,129 | 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 | 2,096 | 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 | 23,816 | 24,374
Residential real estate loans | Residential 1-4 family | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 34,041 | 31,148
Residential real estate loans | Residential 1-4 family | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,913,831 | 1,925,341
Residential real estate loans | Multifamily residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 576,089 | 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 | 13,075 | 13,083
Residential real estate loans | Multifamily residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 13,075 | 13,083
Residential real estate loans | Multifamily residential | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 563,014 | 483,401
Total real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 11,183,839 | 10,952,960
Accruing Loans Past Due 90 Days or More | 532 | 2,739
Total real estate | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 12,773 | 6,708
Total real estate | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 4,151 | 44,663
Total real estate | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 72,669 | 78,490
Total real estate | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 89,593 | 129,861
Total real estate | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 11,094,246 | 10,823,099
Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,227,745 | 1,234,361
Accruing Loans Past Due 90 Days or More | 11 | 32
Consumer | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 7,024 | 7,046
Consumer | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,471 | 68
Consumer | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 6,025 | 6,210
Consumer | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 15,520 | 13,324
Consumer | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,212,225 | 1,221,037
Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,045,036 | 2,022,775
Accruing Loans Past Due 90 Days or More | 2,380 | 2,263
Commercial and industrial | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,125 | 309
Commercial and industrial | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 206 | 1,028
Commercial and industrial | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 9,999 | 13,194
Commercial and industrial | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 12,330 | 14,531
Commercial and industrial | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,032,706 | 2,008,244
Agricultural & other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 495,496 | 554,404
Accruing Loans Past Due 90 Days or More | 341 | 0
Agricultural & other | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 1,107 | 1,082
Agricultural & other | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 32 | 291
Agricultural & other | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 954 | 993
Agricultural & other | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | 2,093 | 2,366
Agricultural & other | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans | $ 493,403 | $ 552,038

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