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Goodwill and Core Deposit Intangibles
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Core Deposit Intangibles GOODWILL AND OTHER INTANGIBLES
Goodwill
The following table details changes in the recorded amount of goodwill as of the dates indicated:
Year Ended December 31,
 20222021
Net carrying value at beginning of period$621.6 $621.6 
Additions to goodwill from acquisition479.3 — 
Net carrying value at end of period$1,100.9 $621.6 
The Company performed its annual impairment assessment as of July 1, 2022 and 2021 and concluded that there was no impairment to goodwill. In addition, there were no events or circumstances that occurred during the second half of 2022 that would more-likely-than-not reduce the fair value of the Company’s reporting unit below its carrying value. The Company did not perform interim impairment testing as of December 31, 2022.
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, 2022 and 2021:
December 31, 2022
CDIOCRITotal
Gross other intangible assets, at beginning of the period$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, end of period$75.9 $21.1 $97.0 
December 31, 2021
Gross other intangible assets, at beginning of the period$106.0 $— $106.0 
Accumulated amortization(64.7)— (64.7)
Net other intangible assets, end of period$41.3 $— $41.3 
The Company recorded $15.9 million, $9.9 million and $10.9 million of other intangible asset amortization expense for the years ended December 31, 2022, 2021, and 2020 respectively.
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:
Years ending December 31, CDIOCRITotal
2023$13.7 $1.9 $15.6 
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$75.9 $21.1 $97.0