Quarterly report pursuant to Section 13 or 15(d)

NET GAIN ON TRADING SECURITIES - Summary of net gain on trading securities (Details)

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NET GAIN ON TRADING SECURITIES - Summary of net gain on trading securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]        
Debt Securities, Trading, Realized Gain (Loss) $ 39,658 $ 11,462 $ 189,193 $ 28,635
Debt Securities, Trading, Unrealized Gain (Loss) (39,255) 7,482 (3,639) 7,695
Debt Securities, Trading, Gain (Loss), Total $ 403 $ 18,944 $ 185,554 $ 36,330