4. GOODWILL AND INTANGIBLE ASSETS

The Company’s intangible assets consist of core deposits, goodwill, and other intangibles arising from acquisitions. The Company has determined that core deposit intangibles have finite lives and amortizes them over their estimated useful lives. Core deposit intangibles are being amortized over the period of expected benefit, which ranges from 4 to 10 years, using an accelerated method. Other amortizable intangible assets are being amortized over the period of expected benefit, which ranges from 4 to 10 years, using various methods.

COVID-19 has disrupted and adversely impacted the economy and created significant volatility in the financial markets. The volatility in the financial markets adversely affected the Company’s expected future cash flows, due to the lower interest rate environment and other factors. The forecasted impact from COVID-19 was included in the Company’s annual goodwill impairment test in the second quarter of 2021 and the Company determined that there was no impairment to its goodwill or intangible assets. In the normal course of business, the Company routinely monitors the impact of the changes in the financial markets and includes these assessments in the Company’s goodwill impairment process.

The Company analyzed its intangible assets at September 30, 2021 and concluded no impairment existed as of the balance sheet date. Amortization expense of intangibles for the three and nine months ended September 30, 2021 and 2020 totaled $3.4 million and $10.7 million, and $4.1 million and $12.7 million, respectively.

As of September 30, 2021, the estimated remaining amortization expense of intangibles is as follows for the years ending (dollars in thousands):

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