Core Deposit Intangibles

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Core Deposit Intangibles

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 6.4 years as of March 31, 2019.

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)	March 31, 2019		December 31, 2018
Gross original amount	$	56,456	$	56,456
Accumulated amortization	29,261		27,900
Net carrying amount	$	27,195	$	28,556

Amortization expense recognized on core deposit intangible assets was $1.4 million for both the three months ended March 31, 2019 and 2018.

The estimated future amortization expense on core deposit intangible assets for periods ending after March 31, 2019 is as follows:

(Dollars in thousands)	Estimated amortization expense
2019	4,081
2020	4,851
2021	4,471
2022	4,218
2023	3,591
2024 and thereafter	5,983