PREMISES AND EQUIPMENT, NET - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 49,334	$ 59,311
Less: Accumulated depreciation and amortization	(46,492)	(55,089)
Total	2,842	4,222
Computer hardware and software
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	46,581	49,339
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	2,390	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	$ 261	$ 346