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GOODWILL AND OTHER INTANGIBLES | 12 Months Ended
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Dec. 31, 2020
Business Combinations [Abstract] |
GOODWILL AND OTHER INTANGIBLE ASSETS | GOODWILL AND OTHER INTANGIBLES On January 5, 2005, ACNB Corporation completed its acquisition of Russell Insurance Group, Inc. (RIG) of Westminster, Maryland. The acquisition of RIG resulted in goodwill of approximately $6,308,000. On July 1, 2017, ACNB Corporation completed its acquisition of New Windsor Bancorp Inc. (New Windsor) of Taneytown, Maryland. The acquisition of New Windsor resulted in goodwill of approximately $13,272,000 and generated $2,418,000 in core deposit intangibles. On January 11, 2020, ACNB Corporation completed its acquisition of Frederick County Bancorp, Inc. (FCBI) of Frederick, Maryland. The acquisition of FCBI resulted in good will of approximately $22,528,000 and generated $3,560,000 in core deposit intangibles. Combined goodwill included in the Corporation’s consolidated statement of condition is $42,108,000. Goodwill, which has an indefinite useful life, is evaluated for impairment annually and is evaluated for impairment more frequently if events and circumstances indicate that the asset might be impaired. The Corporation did not identify any goodwill impairment on RIG or the Bank’s outstanding goodwill from its most recent testing. There are no impairment losses associated with goodwill as of December 31, 2020 and 2019. Additionally, there are no accumulated impairment losses associated with goodwill as of December 31, 2020 and 2019. Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired. Other intangible assets represent purchased assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights. Intangible assets that have finite lives, such as core deposit intangibles, customer relationship intangibles and renewal lists, are amortized over their estimated useful lives and subject to periodic impairment testing. Core deposit intangibles are primarily amortized over ten years using accelerated methods. Customer renewal lists are amortized over their estimated useful lives which range from eight to fifteen years. The carrying value and accumulated amortization of the intangible assets and core deposit intangibles are as follows:
|  | 2020 |  | 2019
Dollars in thousands |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
RIG amortized intangible assets |  | $ | 10,428 |  |  | $ | 7,152 |  |  | $ | 9,890 |  |  | $ | 6,869 |
New Windsor core deposit intangibles |  | 2,418 |  |  | 1,341 |  |  | 2,418 |  |  | 1,012 |
FCBI core deposit intangibles |  | 3,560 |  |  | 648 |  |  | — |  |  | — |
|  | $ | 16,406 |  |  | $ | 9,141 |  |  | $ | 12,308 |  |  | $ | 7,881 |
Amortization expense was $1,264,000 and $621,000 for the years ended December 31, 2020 and 2019, respectively. Amortization of the intangible assets for the five years subsequent to December 31, 2020, is expected to be as follows:
Years Ending | In thousands
2021 | $ | 1,164 |
2022 | 1,056 |
2023 | 947 |
2024 | 830 |
2025 | 707 |
Thereafter | 2,561 |
| $ | 7,265 |

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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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