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Goodwill and Core Deposit Intangibles - Goodwill and Core Deposit Intangibles (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]      
Goodwill, Beginning balance $ 3,396,086 $ 3,231,636  
Goodwill, Ending balance 3,503,129 3,396,086 $ 3,231,636
Core Deposit Intangibles, Beginning balance 63,994 51,348  
Core Deposit Intangibles, Amortization (15,670) (12,676) (10,336)
Core Deposit Intangibles, Ending balance 66,047 63,994 $ 51,348
First Bancshares Merger [Member]      
Finite-Lived Intangible Assets [Line Items]      
Goodwill, Bancshares Merger 316 164,450  
Goodwill, Ending balance 164,800    
Core Deposit Intangibles, Bancshares Merger   $ 25,322  
Core Deposit Intangibles, Ending balance 23,500    
Lone Star Merger [Member]      
Finite-Lived Intangible Assets [Line Items]      
Goodwill, Bancshares Merger 106,727    
Core Deposit Intangibles, Bancshares Merger $ 17,723