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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, 2024	Mar. 31, 2023	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Beginning balance	$ 3,396,086	$ 3,231,636	$ 3,231,636
Goodwill, First Bancshares Merger	316		164,450
Goodwill, Ending balance	3,396,402		3,396,086
Core Deposit Intangibles, Beginning balance	63,994	51,348	51,348
Core Deposit Intangibles, Amortization	(3,237)	$ (2,374)	(12,676)
Core Deposit Intangibles, First Bancshares Merger			25,322
Core Deposit Intangibles, Ending balance	$ 60,757		$ 63,994

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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