The carrying amount of goodwill totaled $67.1 million and $66.1 million as of both September 30, 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
Acquisitions		—		1,009		1,009
Balance, September 30, 2021	$	48,536	$	18,535	$	67,071

Goodwill and other intangible assets added during the period relates to the acquisition of assets of Landmark, which was completed on February 1, 2021 and the acquisition of assets of North Woods, which was completed on August 2, 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):


	September 30,			December 31,
	2021			2020
Other intangibles assets:
Gross carrying amount	$	16,587		$	15,925
Accumulated amortization		(8,999	)		(8,198	)
Net book value	$	7,588		$	7,727

Amortization expense for total other intangible assets was $264 thousand and $801 thousand for the three and nine months ended September 30, 2021, respectively, and $280 thousand and $861 thousand for the three and nine months ended September 30, 2020, respectively. As of September 30, 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)	$	260
2022		985
2023		910
2024		838
2025		766
2026		694