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STOCK BASED COMPENSATION PLANS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted |  |  |  | 63,267 |  |
Stock option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense |  | $ 52 | $ 26 | $ 91 | $ 39 |
Unrecognized compensation cost related to unvested stock options |  | 447 |  | $ 447 |  |
Cost is expected to be recognized period |  |  |  | 2 years 3 months 18 days |  |
Restricted stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense |  | 527 | 717 | $ 1,100 | $ 1,300 |
Unrecognized compensation cost related to non-vested RSAs |  | $ 5,900 |  | $ 5,900 |  |
Cost is expected to be recognized period |  |  |  | 3 years 3 months 18 days |  |
Restricted stock | Time-vested RSAs vest |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of restricted stock awards unvested |  | 290,717 |  | 290,717 |  |
Restricted stock | Performance-based RSAs vest |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of restricted stock awards granted |  |  |  |  | 25,117 |
Vesting period (in years) |  |  |  |  | 2 years |
Number of restricted stock awards unvested |  | 11,248 |  | 11,248 |  |
Directors | Restricted stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period (in years) |  |  |  | 1 year |  |
Deferred compensation expense |  | $ 142 | 140 | $ 285 | $ 275 |
2012 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted | 0 |  |  |  |  |
2012 Plan | Restricted stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of restricted stock awards granted |  |  |  | 77,952 | 82,982 |
Number of restricted stock awards unvested |  | 301,965 |  | 301,965 |  | 324,882
2012 Plan | Restricted stock | Time-vested RSAs vest ratably over five years |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of restricted stock awards granted |  |  |  | 49,925 | 44,750 |
Vesting period (in years) |  |  |  | 5 years | 5 years |
2012 Plan | Restricted stock | Time-vested RSAs vest ratably over three years |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of restricted stock awards granted |  |  |  | 28,027 | 13,115 |
Vesting period (in years) |  |  |  | 3 years | 3 years |
LTI Plan | Restricted stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense |  | $ 173 | $ 119 | $ 343 | $ 220 |
Number of restricted stock awards granted |  |  |  | 22,305 |  |
Number of restricted stock awards unvested |  | 84,055 |  | 84,055 |  | 79,238
Unrecognized compensation cost related to non-vested RSAs |  | $ 1,700 |  | $ 1,700 |  |
Cost is expected to be recognized period |  |  |  | 3 years |  |
LTI Plan | Restricted stock units | Time-vested RSAs vest ratably over five years |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of restricted stock awards granted |  |  |  | 13,255 |  |
Vesting period (in years) |  |  |  | 5 years |  |
LTI Plan | Restricted stock units | Performance-based RSAs vest |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of restricted stock awards granted |  |  |  | 9,050 |  |
Vesting period (in years) |  |  |  | 3 years |  |
LTI Plan | NEOs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted |  |  |  | 63,267 | 47,393 |
Percentage premium over the grant date stock price |  |  |  | 10.00% |  |
Vesting period (in years) |  |  |  | 3 years |  |
Weighted-average grant-date fair value |  |  |  | $ 5.05 | $ 6.52 |
Method used |  |  |  | Black-Scholes option-pricing model |  |

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