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- Summary of Trading Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Total Securities
Amortized Cost	$ 202,145
Gross Unrealized Gains	711
Gross Unrealized (Losses)	(114)
Fair Value (1)	202,742
Debt Securities - Held-to-Maturity
Amortized Cost		$ 134,888
Gross Unrealized Gains		901
Gross Unrealized (Losses)		(400)
Fair Value		135,389
Corporate debt securities
Debt Securities - Trading
Amortized Cost	178,384
Gross Unrealized Gains	389
Gross Unrealized (Losses)	(114)
Fair Value (1)	178,659
Debt Securities - Held-to-Maturity
Amortized Cost		43,166
Gross Unrealized Gains		210
Gross Unrealized (Losses)		(349)
Fair Value		43,027
U.S. treasury securities
Debt Securities - Trading
Amortized Cost	23,761
Gross Unrealized Gains	322
Gross Unrealized (Losses)	0
Fair Value (1)	$ 24,083
Debt Securities - Held-to-Maturity
Amortized Cost		91,722
Gross Unrealized Gains		691
Gross Unrealized (Losses)		(51)
Fair Value		$ 92,362

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