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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Commitments [Line Items] |  |  |
FHLB letters of credit | $ 52,000,000 |  |
Operating leases, rent expense | 919,000 | $ 717,000 | $ 474,000
Letters of credit |  |  |
Other Commitments [Line Items] |  |  |
Potential guarantee obligation | $ 0 | $ 0 |

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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