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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Loans Receivable - Summary of Various Categories of Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 15,285,972		$ 14,764,500
Allowance for credit losses	(285,649)	$ (281,869)	(275,880)	$ (312,574)	$ (295,856)	$ (288,234)
Loans receivable, net	15,000,323		14,488,620
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	8,534,990		8,499,987
Commercial real estate loans \| Non-farm/non-residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	5,494,492		5,426,780
Commercial real estate loans \| Construction/land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,709,197		2,736,214
Allowance for credit losses	(47,413)	(46,741)	(52,271)	(63,398)	(58,673)	(33,877)
Commercial real estate loans \| Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	331,301		336,993
Residential real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	(62,784)	(57,972)	(50,835)	(59,425)	(51,354)	(55,860)
Residential real estate loans \| Residential 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,142,375		1,956,489
Residential real estate loans \| Multifamily residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	716,595		496,484
Total real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	11,393,960		10,952,960
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,233,523		1,234,361
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,100,268		2,022,775
Allowance for credit losses	(61,045)	$ (60,581)	(49,621)	$ (60,603)	$ (69,635)	$ (92,810)
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	346,167		367,251
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 212,054		$ 187,153