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Goodwill and Other Intangible Assets
6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets    

Goodwill

Total goodwill was $465.5 million and $469.4 million as of June 30, 2018 and December 31, 2017, respectively. The $3.9 million decrease in goodwill was due to the sale of the Bank’s DCB branches in March 2018, for which the associated allocated goodwill was written off. Goodwill is tested for impairment on an annual basis as of December 31, 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 16 Business Segments to the Consolidated Financial Statements.

Impairment Analysis

The Company performed its annual impairment analysis as of December 31, 2017, and concluded that there was no goodwill impairment as the fair value of all reporting units exceeded their respective carrying value. There were no triggering events during the three and six months ended June 30, 2018, 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 2017 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 and are included in Other assets on the Consolidated Balance Sheet. These intangibles are tested for impairment on an annual basis, or more frequently as events occur or current circumstances and conditions warrant. Core deposit intangibles associated with the sale of the Bank’s DCB branches with a net carrying value of $1.0 million were written off in the first quarter of 2018. There were no impairment write-downs on the remaining core deposit intangibles for each of the three and six months ended June 30, 2018 and 2017.

The following table presents the gross carrying value of core deposit intangible assets and accumulated amortization as of June 30, 2018 and December 31, 2017:
 
($ in thousands)
 
June 30, 2018
 
December 31, 2017
Gross balance (1)
 
$
86,099

 
$
100,166

Accumulated amortization (1)
 
(68,935
)
 
(79,112
)
Net carrying balance (1)
 
$
17,164

 
$
21,054

 

(1)
Excludes fully amortized core deposit intangible assets.

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 core deposit intangible assets was $1.4 million and $1.8 million for the three months ended June 30, 2018 and 2017, respectively, and $2.9 million and $3.6 million for the six months ended June 30, 2018 and 2017, respectively.

The following table presents the estimated future amortization expense of core deposit intangibles as of June 30, 2018:
 
Year Ended December 31,
 
Amount
($ in thousands)
Remainder of 2018
 
$
2,635

2019
 
4,518

2020
 
3,634

2021
 
2,749

2022
 
1,865

Thereafter
 
1,763

Total
 
$
17,164