(7) Goodwill and Intangible Assets

The carrying amount of goodwill has increased $49,221 since December 31, 2017 as a result of the UCB acquisition, discussed in Note 17. The balance of goodwill was $76,316 at September 30, 2018 and $27,095 at December 31, 2017. Goodwill is not amortized, however, management performs an evaluation of goodwill for impairment annually, or more frequently if events or changes in circumstances indicate that the asset might be impaired. Management last performed an evaluation of the Company’s goodwill during the fourth quarter of 2017 and concluded that the Company’s goodwill was not impaired at December 31, 2017.

The increase in the gross carrying amount of core deposit intangibles relates to the UCB acquisition. Acquired intangible assets, other than goodwill, as of September 30, 2018 and December 31, 2017 were as follows:

	2018						2017
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortized intangible assets(1):
MSRs	$	2,065	$	386	$	1,679	$	1,065	$	322	$	743
Core deposit intangibles		14,792		6,823		7,969		7,274		6,738		536
Total amortized intangible assets	$	16,857	$	7,209	$	9,648	$	8,339	$	7,060	$	1,279

(1)	Excludes fully amortized intangible assets

Aggregate core deposit intangible amortization expense was $26, $158, $85 and $483 for the three and nine-months ended September 30, 2018 and 2017, respectively.

Aggregate mortgage servicing rights amortization was $22, $23, $65 and $51 for the three and nine-months ended September 30, 2018 and 2017, respectively.

Estimated amortization expense for each of the next five years and thereafter is as follows:

	MSRs		Core deposit intangibles		Total
2018	$	22	$	281	$	303
2019		88		945		1,033
2020		88		914		1,002
2021		87		891		978
2022		87		868		955
Thereafter		1,307		4,070		5,377
	$	1,679	$	7,969	$	9,648