Other Intangible Assets

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

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



	December 31,
(Dollars in thousands)	2017		2016
Core deposit intangible assets	$	34,259	$	40,211
Non-compete intangible assets	12		—
Total other intangible assets	$	34,271	$	40,211

Core Deposit Intangible Assets

The Corporation recorded core deposit intangible assets associated with each of its acquisitions. 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 7.5 years as of December 31, 2017.

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:



	December 31,
(Dollars in thousands)	2017		2016
Gross carrying amount	$	59,143	$	59,143
Accumulated amortization	24,884		18,932
Net carrying amount	$	34,259	$	40,211

Amortization expense recognized on core deposit intangible assets was $6.0 million, $5.2 million and $4.1 million for the years ended December 31, 2017, 2016 and 2015, respectively.

The estimated future amortization expense on core deposit intangible assets for the next five years is as follows:



(Dollars in thousands)	Estimated amortization expense
2018	$	5,703
2019	5,441
2020	4,850
2021	4,471
2022	4,218