PREMISES AND EQUIPMENT, NET - Summary by Country (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Premises and equipment	$ 24,526	$ 45,631
United States
Property, Plant and Equipment [Line Items]
Premises and equipment	13,426	25,693
Luxembourg
Property, Plant and Equipment [Line Items]
Premises and equipment	10,295	14,975
India
Property, Plant and Equipment [Line Items]
Premises and equipment	671	3,154
Philippines
Property, Plant and Equipment [Line Items]
Premises and equipment	95	1,754
Uruguay
Property, Plant and Equipment [Line Items]
Premises and equipment	$ 39	$ 55