GOODWILL AND OTHER INTANGIBLES

The activity impacting goodwill in 2019 and 2018 is as follows:



(in thousands)	2019		2018
Balance at beginning of year	$	100,085	$	100,085
Acquisition	18,564		—
Balance at end of year	$	118,649	$	100,085

In the fourth quarter of 2019, the Company completed its annual goodwill impairment testing using balance sheet data as of September 30, 2019 and market data as of November 30, 2019. The analysis was performed at the consolidated Bank level of the Company, which is considered the smallest reporting unit carrying goodwill. The step one analysis under the guidance of ASC 350 was passed, and therefore step two of the goodwill impairment test was not performed and no goodwill impairment was recognized for the year ended December 31, 2019. No impairment was recorded in 2019 and 2018.

The components of other intangible assets in 2019 and 2018 are as follows:



	2019
(in thousands)	Gross Intangible Assets		Accumulated Amortization			Net Intangible Assets
Core deposit intangible (non-maturity deposits)	$	9,483	$	(2,635	)	$	6,848
Customer list and other intangibles	2,065		(272		)	1,793
Total	$	11,548	$	(2,907	)	$	8,641



	2018
(in thousands)	Gross Intangible Assets		Accumulated Amortization			Net Intangible Assets
Core deposit intangible (non-maturity deposits)	$	8,586	$	(1,878	)	$	6,708
Customer list and other intangibles	919		(168		)	751
Total	$	9,505	$	(2,046	)	$	7,459

Other intangible assets are amortized on a straight-line basis over their estimated lives, which range from eight and a half years to twelve years. Amortization expenses related to intangibles totaled $861 thousand in 2019, $828 thousand in 2018 and $812 thousand in 2017.

The estimated aggregate future amortization expense for other intangible assets remaining at year end 2019 is as follows:



(in thousands)	Other Intangible Assets
2020	$	975
2021	932
2022	932
2023	932
2024	932
and thereafter	3,938
Total other intangible assets	$	8,641