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.

No definition available.

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

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- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

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Loans Receivable - Summary of Various Categories of Loans Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 14,513,673	$ 14,424,728
Allowance for credit losses	(290,294)	(288,234)	$ (287,169)	$ (289,669)
Loans receivable, net	14,223,379	14,136,494
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	8,285,138	8,168,157
Commercial real estate loans \| Non-farm/non-residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	5,616,965	5,549,954
Commercial real estate loans \| Construction/land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,330,555	2,293,047
Allowance for credit losses	(35,921)	(33,877)	(31,172)	(32,243)
Commercial real estate loans \| Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	337,618	325,156
Residential real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	(56,903)	(55,860)	(51,433)	(50,963)
Residential real estate loans \| Residential 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,899,974	1,844,260
Residential real estate loans \| Multifamily residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	415,926	435,736
Total real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	10,601,038	10,448,153
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,163,228	1,153,690
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,284,775	2,324,991
Allowance for credit losses	(91,008)	(92,810)	$ (92,396)	$ (89,354)
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	278,609	307,327
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 186,023	$ 190,567