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OPERATING LEASES (Net Rent Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING LEASES      
Total net rent expense $ 8,549 $ 8,290 $ 8,676
Net Occupancy      
OPERATING LEASES      
Add: rent expense charged to equipment expense 8,578 8,318 8,700
Less: sublease income (41) (43) (43)
Total net rent expense 8,537 8,275 8,657
Equipment      
OPERATING LEASES      
Add: rent expense charged to equipment expense $ 12 $ 15 $ 19
Minimum      
OPERATING LEASES      
Period for which option to extend the lease term is available 5 years    
Maximum      
OPERATING LEASES      
Period for which option to extend the lease term is available 15 years