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RETIREMENT PLANS (Schedule of Benefit Plan Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year $ 28,625 $ 26,670  
Service cost 839 795 $ 881
Interest cost 1,135 1,136 1,040
Change in assumptions 2,040 1,059  
Benefits paid (1,092) (1,035)  
Benefit obligation at end of year 31,547 28,625 26,670
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 38,715 36,880  
Actual return on plan assets 4,816 2,870  
Employer contribution 0 0  
Benefits paid (1,092) (1,035)  
Fair value of plan assets at end of year 42,439 38,715 $ 36,880
Funded Status, included in other assets 10,892 10,090  
Amounts recognized in accumulated other comprehensive income: Total net actuarial loss 7,924 8,859  
Amounts recognized in accumulated other comprehensive income: Prior service cost 0 0  
Total included in accumulated other comprehensive loss (pretax) $ 7,924 $ 8,859