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Goodwill and Core Deposit Intangibles - Goodwill and Core Deposit Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 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		3,503,129
Core Deposit Intangibles, Beginning balance	66,047	63,994	63,994
Core Deposit Intangibles, Amortization	(3,641)	$ (3,237)	(15,670)
Core Deposit Intangibles, Ending balance	62,406		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, Bancshares Merger			106,727
Goodwill, Measurement period adjustment	$ (2)
Core Deposit Intangibles, Bancshares Merger			$ 17,723

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