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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | $ 67,055 | $ 59,971
Nonaccrual with Reserve | 12,171 | 2,534
Loans Past Due Over 90 Days Still Accruing | 12,928 | 4,130
Commercial real estate loans | Non-farm/non-residential |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 12,887 | 13,178
Nonaccrual with Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | 9,377 | 2,177
Commercial real estate loans | Construction/land development |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 15,782 | 12,094
Nonaccrual with Reserve | 9,059 | 0
Loans Past Due Over 90 Days Still Accruing | 603 | 255
Commercial real estate loans | Agricultural |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 414 | 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 | 22,037 | 20,351
Nonaccrual with Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | 543 | 84
Residential real estate loans | Multifamily residential |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual |  | 0
Nonaccrual with Reserve |  | 0
Loans Past Due Over 90 Days Still Accruing | 0 | 0
Total real estate |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 51,120 | 46,054
Nonaccrual with Reserve | 9,059 | 0
Loans Past Due Over 90 Days Still Accruing | 10,523 | 2,516
Consumer |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 4,639 | 3,423
Nonaccrual with Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | 48 | 79
Commercial and industrial |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 10,969 | 9,982
Nonaccrual with Reserve | 3,112 | 2,534
Loans Past Due Over 90 Days Still Accruing | 2,311 | 1,535
Agricultural & other |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 327 | 512
Nonaccrual with Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | $ 46 | $ 0

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