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GOODWILL AND INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Information Concerning Intangible Assets with Finite Life | Due to the uncertainties driven by COVID-19, the Company analyzed its intangible assets on a quarterly basis throughout 2020, and concluded no impairment existed as of the balance sheet date. 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, 2020 |  | ​ |  |  | ​ |  |  | ​ |
Core deposit intangibles | ​ | $ | 135,300 | ​ | $ | 88,109 | ​ | $ | 47,191
Other amortizable intangibles | ​ |  | 15,240 | ​ |  | 5,246 | ​ |  | 9,994
December 31, 2019 | ​ |  |  | ​ |  |  | ​ |  |
Core deposit intangibles | ​ | $ | 135,300 | ​ | $ | 73,336 | ​ | $ | 61,964
Other amortizable intangibles | ​ |  | 15,349 | ​ |  | 3,644 | ​ |  | 11,705
Estimated Remaining Amortization Expense of Intangibles | As of December 31, 2020, the estimated remaining amortization expense of intangibles for the years ended is as follows (dollars in thousands): ​
​ | ​ | ​ | ​
2021 |  | $ | 13,874
2022 | ​ | ​ | 11,490
2023 | ​ | ​ | 9,688
2024 | ​ | ​ | 7,818
2025 | ​ | ​ | 6,221
Thereafter | ​ | ​ | 8,094
Total estimated amortization expense | ​ | $ | 57,185

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