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STOCK BASED COMPENSATION - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 12, 2017 | Apr. 09, 2013 | Apr. 08, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-Based Compensation, Shares Authorized Under Equity Incentive Plans |  |  |  |  |  | 1,125,000
Employee Stock Ownership Plan (ESOP), Compensation Expense | $ 1,800,000 | $ 4,200,000 | $ 5,600,000 |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 461,000 | $ 1,100,000 | $ 1,500,000 |  |  |
Number of stock option grants | 0 | 0 | 0 |  |  |
Modifications of stock option | 0 | 0 | 0 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | $ 0 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 590,460 |  |  |  |  |
2013 Plan Member |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  | 435,867 |
2017 Plan Member |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-Based Compensation, Shares Authorized Under Equity Incentive Plans |  |  |  | 1,000,000 |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | $ 56,000 |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition | 11 months 23 days |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value | $ 723,000 | $ 737,000 | $ 726,000,000,000 |  |  |
Vested | 15,600 |  |  |  |  |
Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | $ 2,300,000 |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition | 1 year 10 months 9 days |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value | $ 5,700,000 | $ 5,700,000 | $ 6,600,000 |  |  |
Vested | 120,204 | 126,672 | 137,472 |  |  |

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- Definition Modification of award under share-based payment arrangement. Includes, but is not limited to, terms for expiration date, vesting rights and exercise price. + References No definition available. + Details
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