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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |  |  |
Beginning of year |  |  | $ 21,824 | $ 21,824 | $ 21,824
Acquired goodwill |  |  | 0 | 0 |
Ending balance | $ 21,824 | $ 21,824 | 21,824 | 21,824 | 21,824
Finite-lived intangible assets, net [Abstract] |  |  |  |  |
Balance Acquired |  |  | 11,608 |  | 11,608
Accumulated Amortization | 10,081 |  | 10,081 |  | 9,523
Aggregate amortization expense | 182 | $ 214 | 558 | $ 653 |
Finite-lived intangible assets, future amortization expense [Abstract] |  |  |  |  |
2018 | 176 |  | 176 |  |
2019 | 609 |  | 609 |  |
2020 | 484 |  | 484 |  |
2021 | 258 |  | 258 |  |
2022 | 0 |  | 0 |  |
Total | 1,527 |  | 1,527 |  |
Core deposit intangibles |  |  |  |  |
Finite-lived intangible assets, net [Abstract] |  |  |  |  |
Balance Acquired |  |  | 5,975 |  | 5,975
Accumulated Amortization | 5,489 |  | 5,489 |  | 5,196
Other customer relationship intangibles |  |  |  |  |
Finite-lived intangible assets, net [Abstract] |  |  |  |  |
Balance Acquired |  |  | 5,633 |  | 5,633
Accumulated Amortization | $ 4,592 |  | $ 4,592 |  | $ 4,327

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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