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Goodwill and Other Acquired Intangible Assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Acquired Intangible Assets GOODWILL AND OTHER ACQUIRED INTANGIBLE ASSETS
Goodwill
Changes to the carrying amount of goodwill by reporting unit for the years ended December 31, 2019 and 2018 are provided in the following table:
(in thousands)
IBERIABANK
 
Mortgage
 
LTC
 
Total
Balance, December 31, 2017
$
1,160,559

 
$
23,178

 
$
5,165

 
$
1,188,902

Goodwill acquired and adjustments during the year
43,251

 
—

 
3,380

 
46,631

Balance, December 31, 2018
$
1,203,810

 
$
23,178

 
$
8,545

 
$
1,235,533

Goodwill acquired and adjustments during the year
—

 
—

 
—

 
—

Balance, December 31, 2019
$
1,203,810

 
$
23,178

 
$
8,545

 
$
1,235,533


The goodwill acquired and adjustments made during 2018 were the result of the Sabadell United, Gibraltar, and SolomonParks acquisitions. There were no changes to goodwill during 2019.
The Company performed the required annual goodwill impairment test as of October 1, 2019. The Company’s annual impairment test did not indicate impairment in any of the Company’s reporting units as of the testing date. Following the testing date, management evaluated the events and changes in certain circumstances that could indicate that goodwill might be impaired and concluded that a subsequent test was not necessary.
Intangible assets subject to amortization
Definite-lived intangible assets included in other intangible assets on the Company’s consolidated balance sheets had the following carrying values as of December 31:
 
2019
 
2018
(in thousands)
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Core deposit intangible assets
$
136,183

 
$
(81,493
)
 
$
54,690

 
$
136,183

 
$
(63,213
)
 
$
72,970

Customer relationship intangible asset
1,385

 
(1,371
)
 
14

 
1,385

 
(1,323
)
 
62

Non-compete agreement
206

 
(110
)
 
96

 
206

 
(72
)
 
134

Total
$
137,774

 
$
(82,974
)
 
$
54,800

 
$
137,774

 
$
(64,608
)
 
$
73,166









The related amortization expense of intangible assets was as follows:
(in thousands)
Amount
Aggregate amortization expense for the years ended December 31:
 
2017
$
12,590

2018
21,678

2019
18,464


(in thousands)
 
Estimated amortization expense for the years ended December 31:
 
2020
$
14,504

2021
10,211

2022
7,715

2023
6,396

2024
5,333

2025 and thereafter
10,641