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EMPLOYEE BENEFITS - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Retirement Benefits [Abstract]      
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 $ 226,000 $ 234,000  
Employee stock ownership plan, fair value of shares subject to repurchase obligation $ 34,300,000   $ 31,661,000
Employee stock ownership plan, shares held under plan (in shares) 1,319,225   1,319,225
Employee stock ownership plan, unallocated shares (in shares) 50,000   50,000
Defined Benefit Plan Disclosure [Line Items]      
Cash surrender value of life insurance $ 17,922,000   $ 17,804,000
Bonus expense $ 581,000 499,000  
Unfunded Plan | Nonqualified Plan | Supplemental Retirement Plan | Supplemental Employee Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Salary period used for determining benefit 5 years    
Defined benefit plan expense $ 0 0  
Recorded obligation, defined benefit plan 0   5,000
Unfunded Plan | Nonqualified Plan | Executive Incentive Retirement Plan | Postretirement Life Insurance      
Defined Benefit Plan Disclosure [Line Items]      
Cash surrender value of life insurance 17,922,000   17,804,000
Plan cost 256,000 $ 196,000  
Plan obligation $ 2,251,000   $ 2,002,000