Other Intangible Assets

The following table shows the net carrying value of the Corporation’s other intangible assets.



(Dollars in thousands)	September 30, 2018		December 31, 2017
Core deposit intangible assets	$	29,981	$	34,259
Non-compete intangible assets	—		12
Total other intangible assets	$	29,981	$	34,271

Core Deposit Intangible Assets

The Corporation recorded core deposit intangible assets associated with each of its acquisitions and its merger with Talmer. Core deposit intangible assets are amortized on an accelerated basis over their estimated useful lives and have an estimated remaining weighted-average useful life of 6.8 years as of September 30, 2018.

The following table sets forth the carrying amount and accumulated amortization of core deposit intangible assets that are amortizable and arose from business combinations or other acquisitions:



(Dollars in thousands)	September 30, 2018		December 31, 2017
Gross original amount	$	56,456	$	59,143
Accumulated amortization	26,475		24,884
Net carrying amount	$	29,981	$	34,259

Amortization expense recognized on core deposit intangible assets was $1.4 million and $1.5 million for the three months ended September 30, 2018 and 2017, respectively, and $4.3 million and $4.5 million for the nine months ended September 30, 2018 and 2017, respectively.

The estimated future amortization expense on core deposit intangible assets for periods ending after September 30, 2018 is as follows: 2018 — $1.4 million; 2019 — $5.4 million; 2020 — $4.9 million; 2021 — $4.5 million; 2022 — $4.2 million; 2023 and thereafter — $9.6 million.