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Acquisitions - Additional Information (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Jul. 18, 2025
BankingOffices
LoanProductionOffices
shares
Jul. 16, 2025
USD ($)
$ / shares
Apr. 01, 2024
Centers
Sep. 30, 2025
USD ($)
shares
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Business Acquisition [Line Items]                
Goodwill       $ 3,503,127   $ 3,503,129   $ 3,396,086
Core deposit intangibles       55,194   66,047   $ 63,994
Total assets       38,330,469   39,566,738    
Loans       21,688,143   21,797,404    
Total deposits       $ 27,782,094   $ 28,381,338    
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       106,700        
Core deposit intangibles       $ 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          
American Bank Holding Corporation [Member]                
Business Acquisition [Line Items]                
Business acquisition, equity interest issued or issuable, number of shares | shares 4,439,981              
Number of banking offices | BankingOffices 18              
Total assets         $ 2,550,000      
Loans         1,800,000      
Total deposits         2,290,000      
Number of loan production offices | LoanProductionOffices 2              
Closing price | $ / shares   $ 72.4            
Total consideration   $ 321,500            
Southwest Bancshares Inc [Member]                
Business Acquisition [Line Items]                
Total assets         2,350,000      
Loans         1,890,000      
Total deposits         $ 2,130,000