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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, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | $ 241,100 | $ 268,000
Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 111,743 | 130,721
Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 39,056 | 39,632
Other |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 90,261 | 97,643
Commercial real estate loans | Non-farm/non-residential | Commercial Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 109,144 | 125,861
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 | 2,061 | 4,301
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 | 538 | 559
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 | 25,982 | 26,549
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 | 13,074 | 13,083
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 | 111,743 | 130,721
Total real estate | Residential Real Estate |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Amortized cost | 39,056 | 39,632
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 | 13,997 | 14,228
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 | 75,311 | 82,422
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 | $ 953 | $ 993

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