PREMISES AND EQUIPMENT, NET - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 59,792	$ 61,631
Less: Accumulated depreciation and amortization	(54,025)	(54,758)
Total	5,767	6,873
Computer hardware and software
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	49,484	50,452
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	5,839	5,927
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	3,856	4,441
Office equipment and other
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 613	$ 811