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Goodwill and Other Intangible Assets
6 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Note 10 Goodwill and Other Intangible Assets    

Goodwill

Total goodwill of $469.4 million remained unchanged as of June 30, 2017 compared to December 31, 2016. Goodwill is tested for impairment on an annual basis as of December 31st, or more frequently as events occur or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company’s three operating segments, Retail Banking, Commercial Banking, and Other, are equivalent to the Company’s reporting units. For complete discussion and disclosure, see Note 15 Business Segments to the Consolidated Financial Statements.

Impairment Analysis

The Company performed its annual impairment analysis as of December 31, 2016 and concluded that there was no goodwill impairment as the fair values of all reporting units exceeded the carrying amounts of goodwill. There were no triggering events during the six months ended June 30, 2017 and therefore, no additional goodwill impairment analysis was performed. No assurance can be given that goodwill will not be written down in future periods. Refer to Note 9 Goodwill and Other Intangible Assets to the Consolidated Financial Statements of the Company’s 2016 Form 10-K for additional details related to the Company’s annual goodwill impairment analysis.
    
Core Deposit Intangibles

Core deposit intangibles represent the intangible value of depositor relationships resulting from deposit liabilities assumed in various acquisitions. These intangibles are tested for impairment on an annual basis, or more frequently as events occur, or as current circumstances and conditions warrant. There were no impairment write-downs on core deposit intangibles for the six months ended June 30, 2017 and 2016.

The following table presents the gross carrying value of intangible assets and accumulated amortization as of June 30, 2017 and December 31, 2016:
 
($ in thousands)
 
June 30, 2017
 
December 31, 2016
Gross balance
 
$
108,814

 
$
108,814

Accumulated amortization
 
(84,404
)
 
(80,825
)
Net carrying balance
 
$
24,410

 
$
27,989

 


Amortization Expense

The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits. The amortization expense related to the intangible assets was $1.8 million and $2.1 million for the three months ended June 30, 2017 and 2016, respectively, and $3.6 million and $4.2 million for the six months ended June 30, 2017 and 2016, respectively.

The following table presents the estimated future amortization expense of core deposit intangibles:
 
Year Ended December 31,
 
Amount
($ in thousands)
Remainder of 2017
 
$
3,356

2018
 
5,883

2019
 
4,864

2020
 
3,846

2021
 
2,833

Thereafter
 
3,628

Total
 
$
24,410