PREMISES AND EQUIPMENT, NET - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 47,617	$ 47,649
Less: Accumulated depreciation and amortization	(46,204)	(45,940)
Total	1,413	1,709
Computer hardware and software
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	46,487	46,519
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	1,011	1,011
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	102	102
Office equipment and other
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 17	$ 17