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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Amortization of actuarial loss $ 333,000 $ 0  
Total 401(k) expense 1,000,000 970,000 $ 439,000
Split-dollar life insurance agreement      
Defined Benefit Plan Disclosure [Line Items]      
Accrued liability 671,000 687,000  
Salary continuation agreement expense 57,000 (9,000)  
Certain prior executives and senior officers | Salary continuation agreement      
Defined Benefit Plan Disclosure [Line Items]      
Accrued liability 7,300,000 8,100,000  
Salary continuation agreement expense 752,000 581,000  
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
After tax components of accumulated other comprehensive loss, not yet recognized in net periodic pension cost 573,000    
Expected cash contributions 0    
Expected amortization from accumulated other comprehensive loss into net periodic pension cost $ 0    
Pension Plans | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation 48.00%    
Pension Plans | Fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation 52.00%    
Non-qualified Supplemental Executive Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Amortization of actuarial loss $ (142,000) 16,000  
After tax components of accumulated other comprehensive loss, not yet recognized in net periodic pension cost 317,000    
Expected amortization from accumulated other comprehensive loss into net periodic pension cost 15,000    
Actuarial loss (gain) $ (585,000) $ (590,000)