GOODWILL AND OTHER INTANGIBLES

The activity impacting goodwill in 2018 and 2017 is as follows:



(in thousands)	2018		2017
Balance at beginning of year	$	100,085	$	4,935
Acquisition	—		95,150
Balance at end of year	$	100,085	$	100,085

In 2018, the Company completed its annual goodwill impairment testing using data as of September 30, 2018. 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, 2018. No impairment was recorded in 2017 and 2016.

The components of other intangible assets in 2018 and 2017 are as follows:



	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



	2017
(in thousands)	Gross Intangible Assets		Accumulated Amortization			Net Intangible Assets
Core deposit intangible (non-maturity deposits)	$	8,585	$	(1,136	)	$	7,449
Customer list and other intangibles	1,016		(82		)	934
Total	$	9,601	$	(1,218	)	$	8,383

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 $828 thousand in 2018, $812 thousand in 2017 and $92 thousand in 2016.

The estimated aggregate future amortization expense for other intangible assets remaining at year end 2018 is as follows:



(in thousands)		Other Intangible Assets
2019		827
2020		827
2021		742
2022		734
2023		734
and thereafter		3,595
Total other intangible assets		7,459