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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
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
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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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Loans Receivable - Summary of Various Categories of Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 14,952,116	$ 14,764,500
Allowance for credit losses	(279,944)	(275,880)	$ (290,294)	$ (288,234)
Loans receivable, net	14,672,172	14,488,620
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	8,659,878	8,499,987
Commercial real estate loans \| Non-farm/non-residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	5,588,681	5,426,780
Commercial real estate loans \| Construction/land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,735,760	2,736,214
Allowance for credit losses	(48,176)	(52,271)	(35,921)	(33,877)
Commercial real estate loans \| Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	335,437	336,993
Residential real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	(53,408)	(50,835)	(56,903)	(55,860)
Residential real estate loans \| Residential 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,947,872	1,956,489
Residential real estate loans \| Multifamily residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	576,089	496,484
Total real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	11,183,839	10,952,960
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,227,745	1,234,361
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,045,036	2,022,775
Allowance for credit losses	(60,122)	(49,621)	$ (91,008)	$ (92,810)
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	314,323	367,251
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 181,173	$ 187,153