Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Net carrying value of other intangible assets

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

Carrying amount, accumulated amortization and amortization expense of core deposit intangible assets

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

Estimated future amortization expense on CDIs

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