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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets
(in thousands) | Banking |  | Insurance |  | Wealth Management |  | Total
Balance at January 1, 2017 | $ | 64,369 |  |  | $ | 20,043 |  |  | $ | 8,211 |  |  | $ | 92,623 |
Goodwill related to sale of portion of business unit 1 | 0 |  |  | (332 | ) |  | 0 |  |  | (332 | )
Balance at December 31, 2017 | $ | 64,369 |  |  | $ | 19,711 |  |  | $ | 8,211 |  |  | $ | 92,291 |
Goodwill related to sale of portion of business unit 1 | 0 |  |  | (8 | ) |  | 0 |  |  | (8 | )
Balance at December 31, 2018 | $ | 64,369 |  |  | $ | 19,703 |  |  | $ | 8,211 |  |  | $ | 92,283 |
1 The $8,000 and $332,000 reduction of goodwill in 2018 and 2017, respectively, reflects an adjustment related to the sale of a portion of insurance revenues. In 2017, Tompkins Insurance sold a portion of its personal lines insurance revenues, which had been acquired in a previous acquisition, to a third party. In 2018, Tompkins Insurance adjusted the goodwill related to the sale in 2017. Goodwill is assigned to reporting units. The Company reviews its goodwill and intangible assets annually, or more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. Based on the Company’s review as of December 31, 2018, there was no impairment of its goodwill or intangible assets. The Company’s impairment testing is highly sensitive to certain assumptions and estimates used. In the event that economic or credit conditions deteriorate significantly, additional interim impairment tests may be required. Other Intangible Assets The following table provides information regarding the Company's amortizing intangible assets:
December 31, 2018 | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
(in thousands) |  |  |  |  |
Amortized intangible assets: |  |  |  |  |
Core deposit intangible | $ | 18,774 |  |  | $ | 15,386 |  |  | $ | 3,388 |
Customer relationships | 8,877 |  |  | 5,888 |  |  | 2,989 |
Other intangibles | 5,983 |  |  | 4,732 |  |  | 1,251 |
Total intangible assets | $ | 33,634 |  |  | $ | 26,006 |  |  | $ | 7,628 |
December 31, 2017 | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
(in thousands) |  |  |  |  |
Amortized intangible assets: |  |  |  |  |
Core deposit intangible | $ | 18,774 |  |  | $ | 14,302 |  |  | $ | 4,472 |
Customer relationships | 8,878 |  |  | 5,339 |  |  | 3,539 |
Other intangibles | 5,776 |  |  | 4,524 |  |  | 1,252 |
Total intangible assets | $ | 33,428 |  |  | $ | 24,165 |  |  | $ | 9,263 |
Amortization expense related to intangible assets totaled $1.8 million in 2018, $1.9 million in 2017 and $2.1 million in 2016. The estimated aggregate future amortization expense for intangible assets remaining as of December 31, 2018 is as follows:
Estimated amortization expense:* |
(in thousands) |
For the year ended December 31, 2019 | $ | 1,671 |
For the year ended December 31, 2020 | 1,472 |
For the year ended December 31, 2021 | 1,307 |
For the year ended December 31, 2022 | 864 |
For the year ended December 31, 2023 | 302 |
*Excludes the amortization of mortgage servicing rights. Amortization of mortgage servicing rights was $69,000 in 2018, $122,000 in 2017 and $157,000 in 2016.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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