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Goodwill and Core Deposit Intangibles - Goodwill and Core Deposit Intangibles (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]          
Goodwill, Beginning balance     $ 3,396,086 $ 3,231,636 $ 3,231,636
Goodwill, Ending balance $ 3,504,388 $ 3,504,388 3,504,388 3,504,388 3,396,086
Core Deposit Intangibles, Beginning balance     63,994 51,348 51,348
Core Deposit Intangibles, Amortization (4,146) (3,576) (11,539) (9,117) (12,676)
Core Deposit Intangibles, Ending balance 70,178 $ 70,178 70,178 $ 70,178 63,994
First Bancshares Merger [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goodwill, Bancshares Merger     316   164,450
Goodwill, Ending balance 164,800   164,800    
Core Deposit Intangibles, Bancshares Merger         $ 25,322
Lone Star State Bancshares Merger [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goodwill, Bancshares Merger     107,986    
Goodwill, Ending balance 108,000   108,000    
Core Deposit Intangibles, Bancshares Merger     17,723    
Core Deposit Intangibles, Ending balance $ 17,700   $ 17,700