The carrying amount of goodwill totaled $66.7 million and $66.1 million as of both March 31, 2021 and December 31, 2020. The Company performs a goodwill impairment test on an annual basis as of October 1st or more frequently if events and circumstances warrant.

	Banking		All Other ⁽¹⁾		Total
Balance, December 31, 2020	$	48,536	$	17,526	$	66,062
Acquisition		—		611		611
Balance, March 31, 2021	$	48,536	$	18,137	$	66,673

⁽¹⁾ All Other includes the SDN, Courier Capital and HNP Capital reporting units

Goodwill and other intangible assets added during the period relates to the acquisition of assets of Landmark Group, which was completed on February 1, 2021. See Note 2 – Business Combinations for additional information.

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):

	March 31,			December 31,
	2021			2020
Other intangibles assets:
Gross carrying amount	$	16,324		$	15,925
Accumulated amortization		(8,469	)		(8,198	)
Net book value	$	7,855		$	7,727

Amortization expense for total other intangible assets was $271 thousand and $294 thousand for the three months ended March 31, 2021 and 2020, respectively. As of March 31, 2021, the estimated amortization expense of other intangible assets for the remainder of 2021 and each of the next five years is as follows (in thousands):

2021 (remainder of year)	$	779
2022		960
2023		887
2024		816
2025		745
2026		675