| EMPLOYEE BENEFITS AND STOCK BASED COMPENSATION (Estimated Unamortized Compensation Expense Recognized in Future) (Details) $ in Thousands | Dec. 31, 2018  USD ($) | 
|---|---|
| Estimated unamortized compensation expense recognized in future | |
| 2019 | $ 5,911 | 
| 2020 | 3,756 | 
| 2021 | 1,371 | 
| 2022 | 227 | 
| Total | 11,265 | 
| Restricted Stock | |
| Estimated unamortized compensation expense recognized in future | |
| 2019 | 4,644 | 
| 2020 | 3,047 | 
| 2021 | 1,291 | 
| 2022 | 227 | 
| Total | 9,209 | 
| Performance Stock | |
| Estimated unamortized compensation expense recognized in future | |
| 2019 | 1,267 | 
| 2020 | 709 | 
| 2021 | 80 | 
| 2022 | 0 | 
| Total | $ 2,056 | 
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- Definition Unrecognized cost of unvested share-based compensation awards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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