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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets

Goodwill was as follows:
 
At December 31,
(In thousands)
2019
 
2018
Goodwill related to consumer banking segment
$
764,389

 
$
141,246

Goodwill related to commercial banking segment
535,489

 
13,511

Goodwill, net
$
1,299,878

 
$
154,757


 
The Corporation recorded goodwill in the amount of $1.1 billion related to the merger with Legacy TCF and Chemical completed on August 1, 2019. Goodwill was allocated to the appropriate reporting unit based on the relative fair value of assets acquired and deposits held by the reporting unit. This methodology allocates goodwill in proportion to the assets held by each reporting unit as well as incorporating the value of the funding source provided by the in place deposits. The reporting units aggregate between the Consumer Banking and Commercial Banking segments. See "Note 2. Merger" for further information. There was an impairment charge to goodwill of $73.0 million in 2017 related to the acquisition of Gateway One as a result of the Corporation's decision to discontinue auto finance loan originations effective December 31, 2017. Goodwill related to Gateway One was fully impaired at December 31, 2017. There was no impairment of goodwill in 2019 and 2018.

The following table sets forth the carrying amount and accumulated amortization of intangible assets that are amortizable and arose from business combinations or other acquisitions.
(In thousands)
 
Core deposit intangibles
 
Program agreements
 
Non-compete agreements
 
Customer relationships
 
Total
At December 31, 2019
 
 
 
 
 
 
 
 
 
 
Gross carrying value
 
$
141,232

 
$
14,700

 
$
9,000

 
$
21,949

 
$
186,881

Accumulated amortization
 
(11,016
)
 
(1,031
)
 
(5,618
)
 
(848
)
 
(18,513
)
Net carrying amount
 
$
130,216

 
$
13,669

 
$
3,382

 
$
21,101

 
$
168,368

At December 31, 2018
 
 
 
 
 
 
 
 
 
 
Gross carrying value
 
$
3,049

 
$
14,700

 
$
9,250

 
$
600

 
$
27,599

Accumulated amortization
 
(2,502
)
 
(408
)
 
(3,643
)
 
(550
)
 
(7,103
)
Net carrying amount
 
$
547

 
$
14,292

 
$
5,607

 
$
50

 
$
20,496



There was no impairment of other intangible assets in 2019 and 2018. There was an impairment charge of $368 thousand in 2017 related to the customer relationships intangible asset attributable to Gateway One as a result of the Corporation's decision to discontinue auto finance loan originations effective December 31, 2017. The Gateway One customer relationships intangible asset was fully impaired at December 31, 2017 and written off in 2018.

Amortization expense for intangible assets was $11.7 million, $3.4 million and $2.0 million for 2019, 2018 and 2017, respectively.

The estimated future amortization expense on intangible assets for the next five years is as follows:
(In thousands)
 
Total
2020
 
$
21,992

2021
 
20,136

2022
 
18,180

2023
 
16,868

2024
 
16,161



On August 1, 2019, the Corporation completed the merger with Chemical. As a result, the Corporation recorded $159.5 million in intangible assets consisting of core deposits and customer relationships intangibles. See "Note 2. Merger" for further information.