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GOODWILL AND INTANGIBLE ASSETS
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS
GOODWILL AND INTANGIBLE ASSETS

The change in the carrying value of goodwill for the years ended December 31, 2017 and 2016 is summarized below.
 
December 31,
(dollars in thousands)
2017
 
2016
Carrying amount of goodwill at beginning of year
$
125,532

 
$
90,082

Additions related to acquisitions in current year

 
35,485

Fair value adjustments related to acquisitions in prior year

 
(35
)
Carrying amount of goodwill at end of year
$
125,532

 
$
125,532



During 2016, the Company recorded goodwill totaling $35,485,000 related to the acquisition of JAXB. During 2016, the Company recorded a reduction of $35,000 of goodwill related to the 2015 Merchants acquisition.

Impairment exists when a reporting unit’s carrying value of goodwill exceeds its fair value. At December 31, 2017, the Company’s reporting unit had positive equity and the Company elected to perform a qualitative assessment to determine if it was more likely than not that the fair value of the reporting unit exceeded its carrying value, including goodwill. The qualitative assessment indicated that it was more likely than not that the fair value of the reporting unit exceeded its carrying value, resulting in no impairment.

The carrying value of intangible assets as of December 31, 2017 and 2016 was $13,496,000 and $17,428,000, respectively. Intangible assets are comprised solely of core deposit intangibles. The Company recorded a core deposit intangible asset of $4,746,000 associated with the acquisition of JAXB during 2016. The amortization period used for core deposit intangibles ranges from seven to ten years. Following is a summary of information related to acquired intangible assets:
 
As of December 31, 2017
 
As of December 31, 2016
(dollars in thousands)
Gross
Amount
 
Accumulated
Amortization
 
Gross
Amount
 
Accumulated
Amortization
Amortized intangible assets - core deposit premiums
$
26,250

 
$
12,754

 
$
26,250

 
$
8,822



The aggregate amortization expense for intangible assets was approximately $3,932,000, $4,376,000, and $3,741,000 for the years ended December 31, 2017, 2016 and 2015, respectively.

The estimated amortization expense for each of the next five years is as follows (in thousands):
2018
$
3,697

2019
3,622

2020
2,915

2021
1,691

2022
653

Thereafter
918

 
$
13,496