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Allowance for Credit Losses, Credit Quality and Other - Amortized Cost Basis of Collateral-dependent Impaired Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | $ 94,900 | $ 221,100
Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 52,594 | 164,554
Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 21,386 | 21,801
Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 20,913 | 34,749
Commercial real estate loans | Non-farm/non-residential | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 39,813 | 162,268
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 | 12,350 | 2,008
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 | 431 | 278
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 | Residential 1-4 family | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Residential Real Estate | Residential 1-4 family | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 21,386 | 20,832
Residential Real Estate | Residential 1-4 family | Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Residential Real Estate | Multifamily residential | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Residential Real Estate | Multifamily residential | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 969
Residential Real Estate | 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 | 52,594 | 164,554
Total real estate | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 21,386 | 21,801
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 | 3,511 | 2,888
Commercial & Industrial | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Commercial & Industrial | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 0 | 0
Commercial & Industrial | Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 16,890 | 30,334
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 | $ 512 | $ 1,527

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