Annual report pursuant to Section 13 and 15(d)

NET GAIN ON TRADING SECURITIES - Narrative (Details)

v3.23.2
NET GAIN ON TRADING SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Debt Securities, Available-for-Sale [Line Items]      
Equity securities FVNI portfolio shares SPBX $ 478 $ 18,408 $ 11,259
Number of equity shares exchanged (in shares) 7,500,000    
Debt securities, trading, realized gain (loss) $ 36,226 (206,239) (20,135)
Debt Securities, Trading, Unrealized Gain (Loss) (107,310) 50,987 (8,672)
Net gain on trading securities 71,084 $ 155,252 $ 28,807
SBPX Shares      
Debt Securities, Available-for-Sale [Line Items]      
Debt securities, trading, realized gain (loss) 73,384    
Debt Securities, Trading, Unrealized Gain (Loss) $ 50,785