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Goodwill and Other Intangible Assets | 9 Months Ended
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Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Note 10 — Goodwill and Other Intangible Assets Goodwill Total goodwill of $469.4 million remained unchanged as of September 30, 2017 compared to December 31, 2016. Goodwill is tested for impairment on an annual basis as of December 31 st, or more frequently as events occur or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company’s three operating segments, Retail Banking, Commercial Banking and Other, are equivalent to the Company’s reporting units. For complete discussion and disclosure, see Note 15 — Business Segments to the Consolidated Financial Statements. Impairment Analysis The Company performed its annual impairment analysis as of December 31, 2016 and concluded that there was no goodwill impairment as the fair values of all reporting units exceeded the carrying amounts of goodwill. There were no triggering events during the nine months ended September 30, 2017, and therefore, no additional goodwill impairment analysis was performed. No assurance can be given that goodwill will not be written down in future periods. Refer to Note 9 — Goodwill and Other Intangible Assets to the Consolidated Financial Statements of the Company’s 2016 Form 10-K for additional details related to the Company’s annual goodwill impairment analysis. Core Deposit Intangibles Core deposit intangibles represent the intangible value of depositor relationships resulting from deposit liabilities assumed in various acquisitions and were included in Other assets on the Consolidated Balance Sheets. These intangibles are tested for impairment on an annual basis, or more frequently as events occur, or as current circumstances and conditions warrant. There were no impairment write-downs on core deposit intangibles for the nine months ended September 30, 2017 and 2016. The following table presents the gross carrying value of intangible assets and accumulated amortization as of September 30, 2017 and December 31, 2016:
($ in thousands) |  | September 30, 2017 |  | December 31, 2016
Gross balance |  | $ | 108,814 |  |  | $ | 108,814 |
Accumulated amortization |  | (86,140 | ) |  | (80,825 | )
Net carrying balance |  | $ | 22,674 |  |  | $ | 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 $1.7 million and $2.0 million for the three months ended September 30, 2017 and 2016, respectively, and $5.3 million and $6.2 million for the nine months ended September 30, 2017 and 2016, respectively. The following table presents the estimated future amortization expense of core deposit intangibles:
Year Ended December 31, |  | Amount ($ in thousands)
Remainder of 2017 |  | $ | 1,620 |
2018 |  | 5,883 |
2019 |  | 4,864 |
2020 |  | 3,846 |
2021 |  | 2,833 |
Thereafter |  | 3,628 |
Total |  | $ | 22,674 |

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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 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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