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Allowance for Credit Losses, Credit Quality and Other - Amortized Cost Basis of Collateral-dependent Impaired Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | $ 134,100 | $ 94,900
Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 61,179 | 52,594
Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 48,189 | 21,386
Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 24,758 | 20,913
Commercial real estate loans | Non-farm/non-residential | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 54,382 | 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 | 6,060 | 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 | 737 | 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 | 26,695 | 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 | 21,494 | 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 | 61,179 | 52,594
Total real estate | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 48,189 | 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 | 10,527 | 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 | 13,157 | 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 | $ 1,074 | $ 512

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