BORROWINGS - Issued and Outstanding SBA Debentures (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2024 USD ($) poolingDate	Dec. 31, 2023	Dec. 31, 2024 USD ($) poolingDate	Dec. 31, 2023	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
Debenture Amount	$ 934,875		$ 934,875		$ 779,875
SBA Debentures | Unsecured Debt
Debt Instrument [Line Items]
Debenture Amount	$ 175,000		$ 175,000		$ 153,000
Number of pooling date | poolingDate	2		2
Weighted average effective interest rate	4.40%	4.24%	4.39%	4.13%
Debentures due September 2031 | Unsecured Debt
Debt Instrument [Line Items]
Fixed Interest Rate	1.575%		1.575%
Debenture Amount	$ 15,000		$ 15,000
Debentures due March 2032 | Unsecured Debt
Debt Instrument [Line Items]
Fixed Interest Rate	3.209%		3.209%
Debenture Amount	$ 25,000		$ 25,000
Debentures due September 2032 | Unsecured Debt
Debt Instrument [Line Items]
Fixed Interest Rate	4.435%		4.435%
Debenture Amount	$ 40,000		$ 40,000
Debentures due March 2033 | Unsecured Debt
Debt Instrument [Line Items]
Fixed Interest Rate	5.215%		5.215%
Debenture Amount	$ 40,000		$ 40,000
Debentures due September 2033 | Unsecured Debt
Debt Instrument [Line Items]
Fixed Interest Rate	5.735%		5.735%
Debenture Amount	$ 10,000		$ 10,000
Debentures due March 2034 | Unsecured Debt
Debt Instrument [Line Items]
Fixed Interest Rate	5.164%		5.164%
Debenture Amount	$ 15,000		$ 15,000
Debentures due September 2034 | Unsecured Debt
Debt Instrument [Line Items]
Fixed Interest Rate	4.509%		4.509%
Debenture Amount	$ 8,000		$ 8,000
Small Business Administration Debentures Due, March 2025 | Unsecured Debt
Debt Instrument [Line Items]
Debenture Amount	$ 22,000		$ 22,000
Weighted average effective interest rate			5.16%