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Investments (Available For Sale Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025
Available-for-sale Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Current	$ 2,713,013	$ 2,708,562
Available For Sale Debt Securities Accumulated Gross Unrealized Gain	5,409	2,915
Gross unrealized losses more than 12 months	(194,813)	(228,875)
Allowance for expected credit loss	(2,443)	(3,104)
Available for sale investments, estimated market value	2,521,166	2,479,498
U.S. treasury securities and government obligations [Member]
Available-for-sale Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Current	108,199	119,289
Available For Sale Debt Securities Accumulated Gross Unrealized Gain	252	206
Gross unrealized losses more than 12 months	(6,629)	(8,353)
Available for sale investments, estimated market value	101,822	111,142
U.S. government agency mortgage-backed securities [Member]
Available-for-sale Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Current	92,874	81,909
Available For Sale Debt Securities Accumulated Gross Unrealized Gain	379	232
Gross unrealized losses more than 12 months	(8,348)	(8,712)
Available for sale investments, estimated market value	84,905	73,429
Obligations of states and political subdivisions [Member]
Available-for-sale Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Current	135,370	137,280
Available For Sale Debt Securities Accumulated Gross Unrealized Gain	392	272
Gross unrealized losses more than 12 months	(8,259)	(8,808)
Available for sale investments, estimated market value	127,503	128,744
Corporate securities [Member]
Available-for-sale Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Current	1,759,338	1,807,605
Available For Sale Debt Securities Accumulated Gross Unrealized Gain	2,657	1,623
Gross unrealized losses more than 12 months	(133,309)	(155,749)
Allowance for expected credit loss	(2,443)	(3,104)
Available for sale investments, estimated market value	1,626,243	1,650,375
Mortgage-backed securities [Member]
Available-for-sale Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Current	617,232	562,479
Available For Sale Debt Securities Accumulated Gross Unrealized Gain	1,729	582
Gross unrealized losses more than 12 months	(38,268)	(47,253)
Available for sale investments, estimated market value	$ 580,693	$ 515,808

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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).

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