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Goodwill and Core Deposit Intangibles
 12 Months Ended
Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Core Deposit Intangibles GOODWILL AND OTHER INTANGIBLES
Goodwill
The Company has goodwill with a carrying value of $1,100.9 million as of December 31, 2025 and 2024 and performed its annual impairment assessment as of July 1, 2025 and 2024 concluding there was no impairment to goodwill. In addition, there were no events or circumstances that occurred during the second half of 2025 that would more-likely-than-not reduce the fair value of the Company’s reporting unit below its carrying value.
Other Intangible Assets
Other intangible assets are comprised of core deposit intangibles (“CDI”) and other customer relationship intangibles (“OCRI”) and amounted to the following at December 31, 2025 and 2024:
December 31, 2025CDIOCRITotal
Gross other intangible assets, at January 1, 2025
$154.7 $22.8 $177.5 
Accumulated amortization(116.9)(7.3)(124.2)
Net other intangible assets, end of period$37.8 $15.5 $53.3 
December 31, 2024
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 
The Company recorded $13.6 million, $14.6 million and $15.7 million of other intangible asset amortization expense for the years ended December 31, 2025, 2024, and 2023 respectively.
CDI and OCRI are evaluated for impairment if events and circumstances indicate a possible impairment.
The following table provides the estimated aggregate future amortization expense of other intangible assets:
Years ending December 31, CDIOCRITotal
2026$11.2 $1.9 $13.1 
20278.3 1.9 10.2 
20285.4 1.9 7.3 
20294.5 1.9 6.4 
20304.2 1.9 6.1 
Thereafter4.2 6.0 10.2 
Total$37.8 $15.5 $53.3