BORROWINGS - Schedule of Issued and Outstanding SBA Debentures (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2023 USD ($) poolingDate	Jun. 30, 2022	Mar. 31, 2023 USD ($)
Debt Instrument [Line Items]
Outstanding Balance	$ 681,875		$ 645,000
Unsecured Debt | SBA Debentures
Debt Instrument [Line Items]
Outstanding Balance	$ 125,000		$ 120,000
Number of pooling date | poolingDate	2
Weighted-average interest rate	3.94%	2.50%
Unsecured Debt | Debentures due September 2031
Debt Instrument [Line Items]
Fixed Interest Rate	1.575%
Outstanding Balance	$ 15,000
Unsecured Debt | Debentures due March 2032
Debt Instrument [Line Items]
Fixed Interest Rate	3.209%
Outstanding Balance	$ 25,000
Unsecured Debt | Debentures due September 2032
Debt Instrument [Line Items]
Fixed Interest Rate	4.435%
Outstanding Balance	$ 40,000
Unsecured Debt | Debentures due March 2033
Debt Instrument [Line Items]
Fixed Interest Rate	5.215%
Outstanding Balance	$ 40,000
Unsecured Debt | Debentures not pooled
Debt Instrument [Line Items]
Outstanding Balance	$ 5,000
Weighted-average interest rate	5.66%