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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

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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