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Investments (Available For Sale Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Mar. 31, 2024
Available-for-sale Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Current	$ 2,682,830	$ 2,660,093
Available For Sale Debt Securities Accumulated Gross Unrealized Gain	1,933	6,087
Gross unrealized losses more than 12 months	(244,026)	(222,624)
Allowance for expected credit loss	(2,814)	(1,052)
Available for sale investments, estimated market value	2,437,923	2,442,504
U.S. treasury securities and government obligations [Member]
Available-for-sale Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Current	150,029	191,070
Available For Sale Debt Securities Accumulated Gross Unrealized Gain	208	2,123
Gross unrealized losses more than 12 months	(9,348)	(8,921)
Available for sale investments, estimated market value	140,889	184,272
U.S. government agency mortgage-backed securities [Member]
Available-for-sale Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Current	45,374	48,067
Available For Sale Debt Securities Accumulated Gross Unrealized Gain	107	250
Gross unrealized losses more than 12 months	(8,255)	(7,664)
Available for sale investments, estimated market value	37,226	40,653
Obligations of states and political subdivisions [Member]
Available-for-sale Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Current	142,067	151,197
Available For Sale Debt Securities Accumulated Gross Unrealized Gain	197	918
Gross unrealized losses more than 12 months	(9,098)	(7,533)
Available for sale investments, estimated market value	133,166	144,582
Corporate securities [Member]
Available-for-sale Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Current	1,943,081	1,963,249
Available For Sale Debt Securities Accumulated Gross Unrealized Gain	1,271	2,762
Gross unrealized losses more than 12 months	(171,608)	(152,799)
Allowance for expected credit loss	(2,814)	(1,052)
Available for sale investments, estimated market value	1,769,930	1,812,160
Mortgage-backed securities [Member]
Available-for-sale Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Current	402,279	306,510
Available For Sale Debt Securities Accumulated Gross Unrealized Gain	150	34
Gross unrealized losses more than 12 months	(45,717)	(45,707)
Available for sale investments, estimated market value	$ 356,712	$ 260,837

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- Definition

Amount of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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