PREMISES AND EQUIPMENT, NET - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 47,705	$ 59,311
Less: Accumulated depreciation and amortization	(45,537)	(55,089)
Total	2,168	4,222
Computer hardware and software
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	46,568	49,339
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	1,011	5,794
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	102	3,832
Office equipment and other
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 24	$ 346