EMPLOYEE LOANS AND ALLOWANCE FOR LOAN LOSSES (Categories of Employee Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]
Employee loans, gross	$ 4,210	$ 5,978
Allowance for loan losses	0	0
Employee loans, net of allowance	4,210	5,978
Housing loans
Loans and Leases Receivable Disclosure [Line Items]
Employee loans, gross	3,513	5,448
Relocation and other loans
Loans and Leases Receivable Disclosure [Line Items]
Employee loans, gross	$ 697	$ 530