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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

X

- Definition

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/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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

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