ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2018
Furniture/equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Minimum | Leasehold improvements, including artwork
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	4 years
Maximum | Leasehold improvements, including artwork
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years