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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 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | $ 59,971 | $ 51,011
Nonaccrual With Reserve | 2,534 | 8,383
Loans Past Due Over 90 Days Still Accruing | 4,130 | 9,845
Commercial real estate loans | Non-farm/non-residential |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 13,178 | 12,219
Nonaccrual With Reserve | 0 | 8,383
Loans Past Due Over 90 Days Still Accruing | 2,177 | 1,844
Commercial real estate loans | Construction/ Land Development |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 12,094 | 1,977
Nonaccrual With Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | 255 | 31
Commercial real estate loans | Agricultural |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 431 | 278
Nonaccrual With Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | 0 | 0
Residential Real Estate | Residential 1-4 family |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 20,351 | 18,083
Nonaccrual With Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | 84 | 1,374
Residential Real Estate | Multifamily residential |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 0 | 0
Nonaccrual With Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | 0 | 0
Total real estate |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 46,054 | 32,557
Nonaccrual With Reserve | 0 | 8,383
Loans Past Due Over 90 Days Still Accruing | 2,516 | 3,249
Consumer |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 3,423 | 2,842
Nonaccrual With Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | 79 | 35
Commercial & Industrial |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 9,982 | 14,920
Nonaccrual With Reserve | 2,534 | 0
Loans Past Due Over 90 Days Still Accruing | 1,535 | 6,300
Agricultural & other |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual | 512 | 692
Nonaccrual With Reserve | 0 | 0
Loans Past Due Over 90 Days Still Accruing | $ 0 | $ 261

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