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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, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 15,633,628	$ 15,686,209
Allowance for credit losses	(297,634)	(297,583)	$ (279,943)	$ (275,880)
Loans receivable, net	15,335,994	15,388,626
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	8,330,179	8,349,517
Commercial real estate loans \| Non-farm/non-residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	5,395,529	5,290,112
Commercial real estate loans \| Construction/land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,613,604	2,726,993
Allowance for credit losses	(49,377)	(48,023)	(48,176)	(52,271)
Commercial real estate loans \| Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	321,046	332,412
Residential real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	(71,983)	(72,692)	(53,408)	(50,835)
Residential real estate loans \| Residential 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,100,374	2,134,334
Residential real estate loans \| Multifamily residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,232,639	1,140,911
Total real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	11,663,192	11,624,762
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,254,936	1,253,746
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,172,267	2,222,401
Allowance for credit losses	(57,171)	(65,932)	$ (60,122)	$ (49,621)
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	329,563	359,879
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 213,670	$ 225,421