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BASIS OF PRESENTATION - Financial Statement Impact (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Other assets | $ 29,793 | $ 24,446 | $ 24,389
Other liabilities | 32,214 | 28,978 | 28,737
Retained earnings | 150,701 | 144,793 | 144,977
Balances Without Adoption of ASC 606 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Other assets | 29,736 |  | 24,389
Other liabilities | 28,694 |  | 28,737
Retained earnings | 150,885 |  | $ 144,977
Adjustments due to Topic 606 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Other assets | 57 | 57 |
Other liabilities | 254 | 241 |
Retained earnings | $ (184) | $ (184) |

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