The carrying amount of goodwill totaled $58.1 million and $67.1 million as of September 30, 2024 and December 31, 2023, respectively. On April 1, 2024, the Company announced and closed on the sale of the assets of its wholly owned subsidiary, SDN. The sale resulted in a $9.0 million reduction in the carrying amount of goodwill.

Goodwill is not amortized but, instead, is subject to impairment tests on at least an annual basis, and more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company performs its annual goodwill impairment test as of October 1st. The Company did not identify an indication of goodwill impairment for any of its reporting units during the quarter ended September 30, 2024.

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,
	2024			2023
Core deposit intangibles:
Gross carrying amount	$	2,042		$	2,042
Accumulated amortization		(2,042	)		(2,042	)
Net book value	$	—		$	—

Other intangibles:
Gross carrying amount	$	7,243		$	14,545
Accumulated amortization		(4,497	)		(9,112	)
Net book value	$	2,746		$	5,433

Amortization expense for total other intangible assets was $112 thousand and $443 thousand for the three and nine months ended September 30, 2024 and $225 thousand and $689 thousand for the three and nine months ended September 30, 2023. The reduction of the net book value in other intangible assets as of September 30, 2024, of $2.6 million was primarily the result of the sale of the assets of SDN.

As of September 30, 2024, the estimated amortization expense of other intangible assets for the remainder of 2024 and each of the next five years is as follows (in thousands):


2024 (remainder of year)	$	109
2025		415
2026		379
2027		343
2028		308
2029		272
Thereafter		920
Total	$	2,746