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Acquisitions - Additional Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
May 31, 2023
Office
Jun. 30, 2024
Centers
Dec. 31, 2024
USD ($)
Location
shares
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2021
USD ($)
Business Acquisition [Line Items]                
Number of bank operating locations | Location     283          
Total assets     $ 39,566,738 $ 38,547,877        
Loans     21,797,404 20,848,176        
Total deposits     28,381,338 27,179,809        
Shareholders’ equity     7,438,495 7,079,330 $ 6,699,374     $ 6,427,236
Goodwill     3,503,129 3,396,086 3,231,636      
Core deposit intangibles, net     66,047 63,994 51,348      
Merger-related expenses     $ 4,444 15,133 $ 272      
West Texas [Member]                
Business Acquisition [Line Items]                
Number of bank operating locations | Location     44          
First Bancshares of Texas, Inc. [Member]                
Business Acquisition [Line Items]                
Total assets             $ 2,140,000  
Loans             1,650,000  
Total deposits             $ 1,710,000  
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          
Finite-lived intangible assets acquired       $ 25,322        
Core deposit intangibles, net     $ 23,500          
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           1,070,000    
Total deposits           $ 1,240,000    
Business acquisition, equity interest issued or issuable, number of shares | shares     2,376,182          
Payments to acquire businesses in cash     $ 64,100          
Goodwill     106,700          
Core deposit intangibles, net     $ 17,700          
Lone Star State Bancshares Inc [Member] | West Texas [Member]                
Business Acquisition [Line Items]                
Number of full-service banking offices | Centers   5            
Minimum [Member]                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful life     10 years          
Maximum [Member]                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful life     15 years