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EMPLOYEE BENEFITS - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Employee stock ownership plan, maximum employer contribution as a percentage of participant's qualified compensation 5.00%    
Employee stock ownership plan, total contributions accrued or paid $ 692 $ 634  
Employee stock ownership plan, shares held under plan (in shares) 1,249,209   1,224,697
Employee stock ownership plan, unallocated shares (in shares) 0   0
Cash surrender value of life insurance $ 34,920   $ 34,495
Bonus expense 728 1,550  
Executive Incentive Retirement Plan | Postretirement Life Insurance | Nonqualified Plan | Unfunded Plan      
Defined Benefit Plan Disclosure [Line Items]      
Cash surrender value of life insurance 34,920   34,495
Plan cost 400 $ 409 602
Plan obligation $ 4,398   $ 4,081