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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

X

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Financing receivable collateral dependent amortized cost.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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