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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]          
Goodwill, Beginning balance     $ 3,503,129 $ 3,396,086 $ 3,396,086
Goodwill, Ending balance $ 3,503,127   3,503,127   3,503,129
Core Deposit Intangibles, Beginning balance     66,047 63,994 63,994
Core Deposit Intangibles, Amortization (3,602) $ (4,146) (10,853) $ (11,539) (15,670)
Core Deposit Intangibles, Ending balance 55,194   55,194   66,047
First Bancshares Merger [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goodwill, Measurement period adjustment         316
Lone Star Merger [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goodwill, Measurement period adjustment     (2)    
Goodwill, Bancshares Merger         106,727
Core Deposit Intangibles, Bancshares Merger         $ 17,723
Lone Star State Bancshares Merger [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goodwill, Ending balance 106,700   106,700    
Core Deposit Intangibles, Ending balance $ 17,700   $ 17,700