(6.)GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill

The carrying amount of goodwill totaled $68.4 million and $65.8 million as of September 30, 2018 and December 31, 2017, respectively. The Company performs a goodwill impairment test on an annual basis as of October 1st or more frequently if events and circumstances warrant.

	Banking		Non-Banking		Total
Balance, December 31, 2017	$	48,536	$	17,304	$	65,840
Acquisition		—		2,572		2,572
Balance, September 30, 2018	$	48,536	$	19,876	$	68,412

Goodwill and other intangible assets added during the period relates to the acquisition of HNP Capital, which was completed on June 1, 2018. See Note 2 – Business Combinations for additional information.

Other Intangible Assets

The Company has other intangible assets that are amortized, consisting of core deposit intangibles and other intangibles (primarily related to customer relationships). Gross carrying amount, accumulated amortization and net book value, were as follows (in thousands):

	September 30,			December 31,
	2018			2017
Other intangibles assets:
Gross carrying amount	$	15,925		$	13,420
Accumulated amortization		(5,484	)		(4,557	)
Net book value	$	10,441		$	8,863

Amortization expense for total other intangible assets was $334 thousand and $927 thousand for the three and nine months ended September 30, 2018, and $288 thousand and $876 thousand for the three and nine months ended September 30, 2017, respectively. As of September 30, 2018, the estimated amortization expense of other intangible assets for the remainder of 2018 and each of the next five years is as follows (in thousands):

2018 (remainder of year)	$	330
2019		1,250
2020		1,134
2021		1,014
2022		923
2023		852