FAIR VALUE (Narrative) (Details) - US Government Obligations and Authorities, Corporate and International Securities [Member] $ in Millions	Mar. 31, 2018 USD ($)
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	$ 3.9
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	$ 1.3