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Allowance for Credit Losses, Credit Quality and Other - Amortized Cost Basis of Loans on Nonaccrual Status and Loans Past Due Over 90 Days Still Accruing (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | $ 95,747 | $ 59,971
Nonaccrual with Reserve | 46,527 | 2,534
Loans Past Due Over 90 Days Still Accruing | 5,356 | 4,130
Commercial real estate loans | Non-farm/non-residential |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 48,086 | 13,178
Nonaccrual with Reserve | 42,025 | 0
Loans Past Due Over 90 Days Still Accruing | 709 | 2,177
Commercial real estate loans | Construction/land development |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 5,403 | 12,094
Nonaccrual with Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | 657 | 255
Commercial real estate loans | Agricultural |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 737 | 431
Nonaccrual with Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | 0 | 0
Residential real estate loans | Residential 1-4 family |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 23,905 | 20,351
Nonaccrual with Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | 1,495 | 84
Residential real estate loans | Multifamily residential |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 592 |
Nonaccrual with Reserve | 0 |
Loans Past Due Over 90 Days Still Accruing | 0 | 0
Total real estate |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 78,723 | 46,054
Nonaccrual with Reserve | 42,025 | 0
Loans Past Due Over 90 Days Still Accruing | 2,861 | 2,516
Consumer |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 7,501 | 3,423
Nonaccrual with Reserve | 2,340 | 0
Loans Past Due Over 90 Days Still Accruing | 28 | 79
Commercial and industrial |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 8,511 | 9,982
Nonaccrual with Reserve | 2,162 | 2,534
Loans Past Due Over 90 Days Still Accruing | 2,405 | 1,535
Agricultural & other |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 1,012 | 512
Nonaccrual with Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | $ 62 | $ 0

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