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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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Loans Receivable - Summary of Various Categories of Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 14,823,979		$ 14,424,728
Allowance for credit losses	(312,574)	$ (295,856)	(288,234)	$ (285,562)	$ (285,683)	$ (289,669)
Loans receivable, net	14,511,405		14,136,494
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	8,573,920		8,168,157
Commercial real estate loans \| Non-farm/non-residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	5,496,536		5,549,954
Commercial real estate loans \| Construction/land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,741,419		2,293,047
Allowance for credit losses	(63,398)	(58,673)	(33,877)	(32,642)	(32,275)	(32,243)
Commercial real estate loans \| Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	335,965		325,156
Residential real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	(59,425)	(51,354)	(55,860)	(54,884)	(51,732)	(50,963)
Residential real estate loans \| Residential 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,932,352		1,844,260
Residential real estate loans \| Multifamily residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	482,648		435,736
Total real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	10,988,920		10,448,153
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,219,197		1,153,690
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,084,667		2,324,991
Allowance for credit losses	(60,603)	$ (69,635)	(92,810)	$ (92,469)	$ (90,474)	$ (89,354)
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	352,963		307,327
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 178,232		$ 190,567