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STOCK BASED COMPENSATION PLANS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Intrinsic value of options exercised | $ 98 | $ 760 | $ 708
Unrecognized compensation cost | $ 549 |  |
Unrecognized compensation cost, expense recognition period | 1 year 7 months 24 days |  |
ISOP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized for issuance | 1,012,500 |  |
Term of plan | 10 years |  |
ISOP | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
ISOP | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 7 years |  |
2015 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized for issuance | 420,000 |  |
Stock award granted to one individual, maximum | 30,000 |  |
2019 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized for issuance | 500,000 |  |
Term of plan | 10 years |  |
Shares available for grant under this plan | 467,616 |  |
Long Term Incentive Program |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Term of plan | 3 years |  |
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 14 |  |
Unrecognized compensation cost, expense recognition period | 6 months 22 days |  |
Stock options | Weighted Average |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost, expense recognition period | 6 years |  |
Stock options and restricted stock awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Tax benefit recognized from compensation expense | $ 78 | 81 | 308
Restricted stock units and performance stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Tax benefit recognized from compensation expense | $ 244 | $ 221 | 423
Performance stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair market value on granted shares (usd per share) | $ 23.24 | $ 26.30 |
Performance period required | 3 years | 3 years |
Intrinsic value of stock units vested and exercised | $ 376 | $ 337 | 285
Performance stock units | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized for issuance | 0 | 0 |
Performance stock units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized for issuance | 26,952 | 19,973 |
Restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Fair market value on granted shares (usd per share) | $ 22.45 | $ 28.66 |
Intrinsic value of stock units vested and exercised | $ 493 | $ 594 | $ 272
Restricted stock units | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair market value on granted shares (usd per share) | $ 22.07 | $ 24.85 |
Restricted stock units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair market value on granted shares (usd per share) | $ 24.67 | $ 30.19 |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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