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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |
Beginning of year | $ 21,824 | $ 21,824 | $ 21,824
Acquired goodwill | 0 | 0 |
Ending balance | 21,824 | 21,824 | 21,824
Finite-lived intangible assets, net [Abstract] |  |  |
Balance Acquired | 11,608 |  | 11,608
Accumulated Amortization | 10,420 |  | 10,257
Aggregate amortization expense | 163 | $ 194 |
Finite-lived intangible assets, future amortization expense [Abstract] |  |  |
2019 | 446 |  |
2020 | 484 |  |
2021 | 258 |  |
2022 | 0 |  |
2023 | 0 |  |
Total | 1,188 |  |
Core deposit intangibles |  |  |
Finite-lived intangible assets, net [Abstract] |  |  |
Balance Acquired | 5,975 |  | 5,975
Accumulated Amortization | 5,651 |  | 5,576
Other customer relationship intangibles |  |  |
Finite-lived intangible assets, net [Abstract] |  |  |
Balance Acquired | 5,633 |  | 5,633
Accumulated Amortization | $ 4,769 |  | $ 4,681

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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