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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Loans Receivable - Summary of Various Categories of Loans Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 14,764,500	$ 14,424,728
Allowance for credit losses	(275,880)	(288,234)	$ (289,669)	$ (236,714)
Loans receivable, net	14,488,620	14,136,494
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	8,499,987	8,168,157
Commercial real estate loans \| Non-farm/non-residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	5,426,780	5,549,954
Commercial real estate loans \| Construction/ Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,736,214	2,293,047
Allowance for credit losses	(52,271)	(33,877)	(32,243)	(28,415)
Commercial real estate loans \| Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	336,993	325,156
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	(50,835)	(55,860)	(50,963)	(48,458)
Residential Real Estate \| Residential 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,956,489	1,844,260
Residential Real Estate \| Multifamily residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	496,484	435,736
Total real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	10,952,960	10,448,153
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,234,361	1,153,690
Commercial & Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,022,775	2,324,991
Allowance for credit losses	(49,621)	(92,810)	$ (89,354)	$ (53,062)
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	367,251	307,327
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 187,153	$ 190,567