Goodwill and Core Deposit Intangibles (Tables)

12 Months Ended

Dec. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Change in Carrying Amount of Goodwill

The Company has goodwill with a carrying value of $1,100.9 million as of December 31, 2024 and 2023 and performed its annual impairment assessment as of July 1, 2024 and 2023 concluding there was no impairment to goodwill. In addition, there were no events or circumstances that occurred during the second half of 2024 that would more-likely-than-not reduce the fair value of the Company’s reporting unit below its carrying value.

Schedule of Activity of Identifiable Core Deposit Intangibles

Other intangible assets are comprised of core deposit intangibles (“CDI”) and other customer relationship intangibles (“OCRI”) and amounted to the following at December 31, 2024 and 2023:

December 31, 2024	CDI		OCRI		Total
Gross other intangible assets, at January 1, 2024	$	154.7	$	22.8	$	177.5
Accumulated amortization	(105.2)		(5.5)		(110.7)
Net other intangible assets, end of period	$	49.5	$	17.3	$	66.8
December 31, 2023
Gross other intangible assets, at January 1, 2023	$	154.7	$	22.8	$	177.5
Accumulated amortization	(92.5)		(3.6)		(96.1)
Net other intangible assets, end of period	$	62.2	$	19.2	$	81.4

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The following table provides the estimated aggregate future amortization expense of other intangible assets:

Years ending December 31,	CDI		OCRI		Total
2025	$	11.7	$	1.9	$	13.6
2026	10.9		1.9		12.8
2027	8.2		1.9		10.1
2028	5.8		1.9		7.7
2029	4.5		1.9		6.4
Thereafter	8.4		7.8		16.2
Total	$	49.5	$	17.3	$	66.8