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DEPOSITS WITH INTERBANK MARKET MAKERS (Details)
Dec. 31, 2018
Counterparty
NatWest Markets PLC [Member]  
Deposits with Interbank Market Makers [Abstract]  
Number of major rating agencies reporting credit ratings considered investment grade for interbank market maker 3
UBS AG [Member]  
Deposits with Interbank Market Makers [Abstract]  
Number of major rating agencies reporting credit ratings considered investment grade for interbank market maker 3