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Acquisitions - Additional Information (Details)
$ in Thousands
 3 Months Ended
May 31, 2023
Office
Mar. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Business Acquisition [Line Items]          
Goodwill   $ 3,396,402 $ 3,396,086   $ 3,231,636
Total assets   38,756,520 38,547,877    
Loans   20,935,028 20,848,176    
Total deposits   $ 27,175,518 $ 27,179,809    
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      
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]          
Total assets   1,380,000      
Loans   1,080,000      
Total deposits   $ 1,240,000