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INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
INTANGIBLE ASSETS | 6. INTANGIBLE ASSETS The Company’s intangible assets consist of core deposits, goodwill, and other intangibles arising from acquisitions. The Company has determined that core deposit intangibles have finite lives and amortizes them over their estimated useful lives. Core deposit intangibles are being amortized over the period of expected benefit, which ranges from 4 to 10 years, using an accelerated method. Other amortizable intangible assets are being amortized over the period of expected benefit, which ranges from 4 to 10 years, using various methods. Refer to Note 2 "Acquisitions" for further information regarding intangible assets. In accordance with ASC 350, Intangibles-Goodwill and Other, the Company reviews the carrying value of indefinite lived intangible assets at least annually or more frequently if certain impairment indicators exist. The Company performed its annual impairment testing in the second quarter of 2019 and determined that there was no impairment to its goodwill or intangible assets. In the second quarter of 2018 the Company wrote off goodwill in the amount of $864,000 related to the wind down of UMG, which is now included in discontinued operations. Information concerning intangible assets with a finite life is presented in the following table (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Gross |  | ​ | ​ |  | Net
​ | ​ | Carrying | ​ | Accumulated | ​ | Carrying
​ | ​ | Value | ​ | Amortization | ​ | Value
December 31, 2019 |  | ​ |  |  | ​ |  |  | ​ |
Core deposit intangibles | ​ | $ | 135,300 | ​ | $ | 73,336 | ​ | $ | 61,964
Other amortizable intangibles | ​ |  | 15,349 | ​ |  | 3,644 | ​ |  | 11,705
December 31, 2018 | ​ |  |  | ​ |  |  | ​ |  |
Core deposit intangibles | ​ | $ | 95,152 | ​ | $ | 57,293 | ​ | $ | 37,859
Other amortizable intangibles | ​ |  | 12,695 | ​ |  | 1,870 | ​ |  | 10,825
​ Amortization expense of intangibles for the years ended December 31, 2019, 2018, and 2017 totaled $18.5 million, $12.8 million, and $6.1 million, respectively. As of December 31, 2019, the estimated remaining amortization expense of intangibles for the years ended is as follows (dollars in thousands): ​
​ | ​ | ​ | ​
2020 |  | $ | 16,483
2021 | ​ | ​ | 13,874
2022 | ​ | ​ | 11,490
2023 | ​ | ​ | 9,687
2024 | ​ | ​ | 7,819
Thereafter | ​ | ​ | 14,316
Total estimated amortization expense | ​ | $ | 73,669
​

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- Definition The entire disclosure for all or part of the information related to 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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