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Goodwill and Core Deposit Intangibles
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill
The Company had goodwill of $1,100.9 million at both September 30, 2023 and December 31, 2022 and concluded during its annual impairment assessment as of July 1, 2023 that there was no impairment to goodwill. In addition, there were no events or circumstances that occurred during the third quarter of 2023 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 September 30, 2023 and December 31, 2022:
September 30, 2023CDIOCRITotal
Gross other intangible assets, at January 1, 2023$154.7 $22.8 $177.5 
Accumulated amortization(89.1)(3.2)(92.3)
Net other intangible assets, at September 30, 2023
$65.6 $19.6 $85.2 
December 31, 2022
Gross other intangible assets, at January 1, 2022$106.0 $— $106.0 
Amounts established through acquisition50.1 22.8 72.9 
Reductions due to sale of health savings accounts(1.4)— (1.4)
Accumulated amortization(78.8)(1.7)(80.5)
Net other intangible assets, at December 31, 2022
$75.9 $21.1 $97.0 
The Company recorded $3.9 million and $4.1 million of other intangible asset amortization expense for the three months ended September 30, 2023 and 2022, respectively, and $11.8 million for the nine months ended September 30, 2023 and 2022.
CDI and OCRI are evaluated for impairment if events and circumstances indicate a possible impairment. CDI is amortized using an accelerated method based on the estimated weighted average useful lives of the related deposits, which is generally 10 years. OCRI is amortized using a straight-line method over its estimated useful life of 12 years based on customer revenue attrition on an annualized basis.
The following table provides the estimated aggregate future amortization expense of other intangible assets at September 30, 2023:
Years Ending December 31,CDIOCRITotal
2023 remaining$3.4 $0.4 $3.8 
202412.7 1.9 14.6 
202511.8 1.9 13.7 
202610.9 1.9 12.8 
20278.2 1.9 10.1 
Thereafter18.6 11.6 30.2 
Total$65.6 $19.6 $85.2