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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)