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EMPLOYEE BENEFITS - Narrative (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
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 $ 551 $ 445  
Employee stock ownership plan, fair value of shares subject to repurchase obligation   34,300  
Employee stock ownership plan, shares held under plan (in shares) 1,322,550   1,314,277
Employee stock ownership plan, unallocated shares (in shares) 0   0
Cash surrender value of life insurance $ 25,590   $ 19,117
Bonus expense 1,513 1,103  
Unfunded Plan | Nonqualified Plan | Executive Incentive Retirement Plan | Postretirement Life Insurance      
Defined Benefit Plan Disclosure [Line Items]      
Cash surrender value of life insurance 25,590   19,117
Plan cost 344 $ 317  
Plan obligation $ 3,642   $ 2,420