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Allowance for Credit Losses, Credit Quality and Other - Amortized Cost Basis of Collateral-dependent Impaired Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | $ 105,300 | $ 94,900
Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 60,992 | 52,594
Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 23,696 | 21,386
Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 20,605 | 20,913
Commercial real estate loans | Non-farm/non-residential | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 44,193 | 39,813
Commercial real estate loans | Non-farm/non-residential | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Commercial real estate loans | Non-farm/non-residential | Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Commercial real estate loans | Construction/land development | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 16,385 | 12,350
Commercial real estate loans | Construction/land development | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Commercial real estate loans | Construction/land development | Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Commercial real estate loans | Agricultural | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 414 | 431
Commercial real estate loans | Agricultural | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Commercial real estate loans | Agricultural | Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Residential real estate loans | Residential 1-4 family | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Residential real estate loans | Residential 1-4 family | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 23,696 | 21,386
Residential real estate loans | Residential 1-4 family | Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Residential real estate loans | Multifamily residential | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Residential real estate loans | Multifamily residential | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Residential real estate loans | Multifamily residential | Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Total real estate | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 60,992 | 52,594
Total real estate | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 23,696 | 21,386
Total real estate | Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Consumer | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Consumer | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Consumer | Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 4,696 | 3,511
Commercial and industrial | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Commercial and industrial | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Commercial and industrial | Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 15,536 | 16,890
Agricultural & other | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Agricultural & other | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Agricultural & other | Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | $ 373 | $ 512

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