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GOODWILL AND OTHER INTANGIBLES | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND OTHER INTANGIBLES | ​ NOTE 6. GOODWILL AND OTHER INTANGIBLES The activity impacting goodwill in 2020 and 2019 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2020 |  | 2019
Balance at beginning of year | ​ | $ | 118,649 | ​ | $ | 100,085
Acquisition | ​ |  | 828 | ​ |  | 18,564
Balance at end of year | ​ | $ | 119,477 | ​ | $ | 118,649
​ In the fourth quarter of 2020, the Company completed its annual goodwill impairment testing using balance sheet and market data as of September 30, 2020. The analysis was performed at the consolidated Bank level of the Company, which is considered the smallest reporting unit carrying goodwill. The step one analysis under the guidance of ASC 350 was passed, and therefore no goodwill impairment was recognized for the year ended December 31, 2020. No impairment was recorded in 2019 and 2018. ​ The components of other intangible assets in 2020 and 2019 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020
​ | ​ | Gross | ​ | Accumulated | ​ | Net Intangible
(in thousands) |  | Intangible Assets |  | Amortization |  | Assets
Core deposit intangible (non-maturity deposits) | ​ | $ | 9,305 | ​ | $ | (3,287) | ​ | $ | 6,018
Customer list and other intangibles | ​ |  | 1,901 | ​ |  | (249) | ​ |  | 1,652
Total | ​ | $ | 11,206 | ​ | $ | (3,536) | ​ | $ | 7,670
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2019
​ | ​ | Gross | ​ | Accumulated | ​ | Net Intangible
(in thousands) |  | Intangible Assets |  | Amortization |  | Assets
Core deposit intangible (non-maturity deposits) | ​ | $ | 9,483 | ​ | $ | (2,635) | ​ | $ | 6,848
Customer list and other intangibles | ​ |  | 2,065 | ​ |  | (272) | ​ |  | 1,793
Total | ​ | $ | 11,548 | ​ | $ | (2,907) | ​ | $ | 8,641
​ Other intangible assets are amortized on a straight-line basis over their estimated lives, which range from 5 years to 11 years. Amortization expenses related to intangibles totaled $1.0 million in 2020, $861 thousand in 2019 and $828 thousand in 2018. The estimated aggregate future amortization expense for other intangible assets remaining at year end 2020 is as follows: ​
​ | ​ | ​ | ​
​ | ​ | Other Intangible
(in thousands) |  | Assets
2021 | ​ | $ | 934
2022 | ​ |  | 932
2023 | ​ |  | 932
2024 | ​ |  | 932
2025 | ​ |  | 932
and thereafter | ​ |  | 3,008
Total | ​ | $ | 7,670
​

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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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