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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 INTANGIBLE ASSETS The changes in goodwill included in the core banking segment during the years ended December 31, 2020 and 2019 were as follows (in thousands):
|  | 2020 |  | 2019
Beginning of year |  | $ | 21,824 |  |  | $ | 21,824 |
Acquired goodwill |  | — |  |  | — |
End of year |  | $ | 21,824 |  |  | $ | 21,824 |
Acquired intangible assets were as follows at December 31, 2020 and 2019 (in thousands):
|  | At December 31, 2020 |  | At December 31, 2019
|  | Balance Acquired |  | Accumulated Amortization |  | Balance Acquired |  | Accumulated Amortization
Core deposit intangibles |  | $ | 5,975 |  |  | $ | 5,962 |  |  | $ | 5,975 |  |  | $ | 5,832 |
Other customer relationship intangibles |  | 5,633 |  |  | 5,388 |  |  | 5,633 |  |  | 5,034 |
Total |  | $ | 11,608 |  |  | $ | 11,350 |  |  | $ | 11,608 |  |  | $ | 10,866 |
Aggregate amortization expense was $0.5 million, $0.6 million, and $0.7 million for 2020, 2019 and 2018, respectively. The remaining estimated aggregate amortization expense at December 31, 2020 is listed below (in thousands):
Year |  | Estimated Expense
2021 |  | $ | 258 |
Total |  | $ | 258 |

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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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