PREMISES AND EQUIPMENT, NET - Summary by Country (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Premises and equipment	$ 11,894	$ 24,526
United States
Property, Plant and Equipment [Line Items]
Premises and equipment	5,530	13,426
Luxembourg
Property, Plant and Equipment [Line Items]
Premises and equipment	5,451	10,295
India
Property, Plant and Equipment [Line Items]
Premises and equipment	822	671
Uruguay
Property, Plant and Equipment [Line Items]
Premises and equipment	91	39
Philippines
Property, Plant and Equipment [Line Items]
Premises and equipment	$ 0	$ 95