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Acquisitions - Additional Information (Details) $ in Thousands			3 Months Ended		6 Months Ended
	Apr. 01, 2024 Centers	May 31, 2023 Office	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) shares	Jun. 30, 2023 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 3,504,107		$ 3,504,107			$ 3,396,086	$ 3,504,107		$ 3,231,636
Core deposit intangibles			74,324		74,324			63,994	$ 74,324		$ 51,348
Total assets			39,762,294		39,762,294			38,547,877
Loans			21,960,963		21,960,963			20,848,176
Total deposits			27,933,086		27,933,086			$ 27,179,809
Merger related expenses			4,381	$ 12,891	4,381	$ 13,751
Provision for credit losses			9,066	18,540	9,066	18,540
Provision for credit losses on off-balance sheet credit exposures			1,143	$ 6,556	$ 1,143	$ 6,556
First Bancshares of Texas, Inc. [Member]
Business Acquisition [Line Items]
Business acquisition, equity interest issued or issuable, number of shares | shares					3,583,370
Payments to acquire businesses in cash					$ 91,500
Goodwill			164,800		$ 164,800
Total assets										$ 2,140,000
Loans										1,650,000
Total deposits										$ 1,710,000
First Bancshares of Texas, Inc. [Member] | West, North and Central Texas [Member]
Business Acquisition [Line Items]
Number of full-service banking offices | Office		16
Lone Star State Bancshares Inc [Member]
Business Acquisition [Line Items]
Business acquisition, equity interest issued or issuable, number of shares | shares					2,376,182
Payments to acquire businesses in cash					$ 64,100
Goodwill			107,700		107,700
Core deposit intangibles			$ 17,700		$ 17,700
Total assets							$ 1,380,000
Loans							1,080,000
Total deposits							$ 1,240,000
Lone Star State Bancshares Inc [Member] | West Texas [Member]
Business Acquisition [Line Items]
Number of full-service banking offices | Centers	5

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