PREMISES AND EQUIPMENT, NET - Summary by Country (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total	$ 28,431	$ 45,631
United States
Property, Plant and Equipment [Line Items]
Total	14,964	25,693
India
Property, Plant and Equipment [Line Items]
Total	708	3,154
Luxembourg
Property, Plant and Equipment [Line Items]
Total	12,615	14,975
Philippines
Property, Plant and Equipment [Line Items]
Total	104	1,754
Other
Property, Plant and Equipment [Line Items]
Total	$ 40	$ 55