EMPLOYEE BENEFITS AND STOCK BASED COMPENSATION (Estimated Unamortized Compensation Expense Recognized in Future) (Details) $ in Thousands  | 
 Dec. 31, 2019  
USD ($) 
 | 
|---|---|
| Estimated unamortized compensation expense recognized in future | |
| 2020 | $ 6,436 | 
| 2021 | 4,186 | 
| 2022 | 652 | 
| 2023 | 100 | 
| Total | 11,374 | 
| Restricted Stock | |
| Estimated unamortized compensation expense recognized in future | |
| 2020 | 5,030 | 
| 2021 | 3,299 | 
| 2022 | 652 | 
| 2023 | 100 | 
| Total | 9,081 | 
| Performance Stock | |
| Estimated unamortized compensation expense recognized in future | |
| 2020 | 1,406 | 
| 2021 | 887 | 
| 2022 | 0 | 
| 2023 | 0 | 
| Total | $ 2,293 | 
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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