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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Other Intangible Assets In accordance with the Intangibles – Goodwill and Other topic of the FASB ASC, goodwill is not amortized but is reviewed for potential impairment at the reporting unit level. Management analyzes its goodwill for impairment on an annual basis and between annual tests in certain circumstances such as upon material adverse changes in legal, business, regulatory and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value. The Company performed its annual impairment assessment as of July 31, 2020 and concluded that there was no impairment. As of December 31, 2020, we determined there were no events or circumstances which would more likely than not reduce the fair value of our reporting unit below its carrying amount. Our CDIs are evaluated for impairment if events and circumstances indicate possible impairment. The CDIs are amortized on an accelerated basis over an estimated life of 10 years each. The following table sets forth activity for goodwill and other intangible assets for the periods indicated:
|  | Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
|  | (in thousands)
Total goodwill, end of period |  | $ | 765,842 |  |  | $ | 765,842 |  |  | $ | 765,842 |
Other intangible assets, net |  |  |  |  |  |
CDI: |  |  |  |  |  |
Gross CDI balance, beginning of period |  | 105,473 |  |  | 105,473 |  |  | 105,473 |
Accumulated amortization, beginning of period |  | (70,934) |  |  | (60,455) |  |  | (48,219) |
CDI, net, beginning of period |  | 34,539 |  |  | 45,018 |  |  | 57,254 |
CDI current period amortization |  | (8,724) |  |  | (10,479) |  |  | (12,236) |
Total CDI, end of period |  | 25,815 |  |  | 34,539 |  |  | 45,018 |
Intangible assets not subject to amortization |  | 919 |  |  | 919 |  |  | 919 |
Other intangible assets, net at end of period |  | 26,734 |  |  | 35,458 |  |  | 45,937 |
Total goodwill and intangible assets, end of period |  | $ | 792,576 |  |  | $ | 801,300 |  |  | $ | 811,779 |
The following table provides the estimated future amortization expense of CDI for the succeeding five years:
|  | Years Ending December 31,
|  | (in thousands)
2021 |  | $ | 7,264 |
2022 |  | 5,880 |
2023 |  | 4,552 |
2024 |  | 3,432 |
2025 |  | 2,415 |

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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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