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Goodwill and Other Intangible Assets | 3 Months Ended
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Mar. 31, 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 March 31, 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 months ended March 31, 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 $1.0 million were written off. There were no impairment write-downs on the remaining core deposit intangibles for each of the three months ended March 31, 2018 and 2017. The following table presents the gross carrying value of core deposit intangible assets and accumulated amortization as of March 31, 2018 and December 31, 2017:
($ in thousands) |  | March 31, 2018 |  | December 31, 2017
Gross balance (1) |  | $ | 86,099 |  |  | $ | 100,166 |
Accumulated amortization (1) |  | (67,562 | ) |  | (79,112 | )
Net carrying balance |  | $ | 18,537 |  |  | $ | 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 $1.5 million and $1.8 million for the three months ended March 31, 2018 and 2017, respectively. The following table presents the estimated future amortization expense of core deposit intangibles as of March 31, 2018:
Year Ended December 31, |  | Amount ($ in thousands)
Remainder of 2018 |  | $ | 4,008 |
2019 |  | 4,518 |
2020 |  | 3,634 |
2021 |  | 2,749 |
2022 |  | 1,865 |
Thereafter |  | 1,763 |
Total |  | $ | 18,537 |

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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