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Acquisitions - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 01, 2024
Centers
May 31, 2023
Office
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Business Acquisition [Line Items]                    
Goodwill     $ 3,504,388 $ 3,504,388 $ 3,504,388 $ 3,504,388   $ 3,396,086   $ 3,231,636
Core deposit intangibles     70,178 70,178 70,178 70,178   63,994   $ 51,348
Total assets     40,115,320   40,115,320     38,547,877    
Loans     22,026,455   22,026,455     20,848,176    
Total deposits     28,087,611   28,087,611     $ 27,179,809    
Merger related expenses     63 1,104 4,444 14,855        
Provision for credit losses     0 $ 0 9,066 18,540        
Provision for credit losses on off-balance sheet credit exposures         $ 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     108,000   108,000          
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