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CORE DEPOSIT INTANGIBLES | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
CORE DEPOSIT INTANGIBLES | CORE DEPOSIT INTANGIBLES Changes in the carrying amount of core deposit intangibles in the accompanying consolidated balance sheets as of December 31 are summarized as follows:
| 2017 |  | 2016
Beginning of year | $ | 3,308 |  |  | $ | 3,846 |
Effect of acquisitions | — |  |  | 42 |
Amortization | (584 | ) |  | (580 | )
End of year | $ | 2,724 |  |  | $ | 3,308 |
Accumulated amortization was $3,107 and $2,523 at December 31, 2017 and 2016, respectively. Amortization expense was $584, $580 and $535 during the years ended December 31, 2017, 2016 and 2015, respectively. The estimated aggregate future amortization expense for core deposit intangibles remaining as of December 31, 2017 was as follows:
Year Ended December 31, | Amount
2018 | $ | 584 |
2019 | 584 |
2020 | 584 |
2021 | 417 |
2022 | 183 |
Thereafter | 372 |
| $ | 2,724 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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