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Investments (Available For Sale Investments) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020
--- | --- | ---
Available-for-sale Securities [Abstract] |  |
Amortized cost | $ 2,317,006 | $ 2,334,215
Gross Unrealized Gains | 105,872 | 135,767
Gross unrealized losses more than 12 months | (1,903) | (1,077)
Gross unrealized losses less than 12 months | (43,245) | (1,292)
Allowance for Expected Credit Losses | (5,407) |
Estimated market value | 2,372,323 | 2,467,613
U.S. treasury securities and government obligations [Member] |  |
Available-for-sale Securities [Abstract] |  |
Amortized cost | 84,814 | 112,421
Gross Unrealized Gains | 12,192 | 7,959
Gross unrealized losses more than 12 months | 0 | (1)
Gross unrealized losses less than 12 months | 0 | 0
Allowance for Expected Credit Losses | 0 |
Estimated market value | 97,006 | 120,379
U.S. government agency mortgage-backed securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Amortized cost | 126,599 | 88,449
Gross Unrealized Gains | 3,458 | 759
Gross unrealized losses more than 12 months | (1) | (1)
Gross unrealized losses less than 12 months | (39) | (373)
Allowance for Expected Credit Losses | 0 |
Estimated market value | 130,017 | 88,834
Obligations of states and political subdivisions [Member] |  |
Available-for-sale Securities [Abstract] |  |
Amortized cost | 270,476 | 287,643
Gross Unrealized Gains | 21,364 | 20,664
Gross unrealized losses more than 12 months | (141) | (155)
Gross unrealized losses less than 12 months | (2) | 0
Allowance for Expected Credit Losses | 0 |
Estimated market value | 291,697 | 308,152
Corporate securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Amortized cost | 1,636,025 | 1,656,425
Gross Unrealized Gains | 66,359 | 100,302
Gross unrealized losses more than 12 months | (1,759) | (919)
Gross unrealized losses less than 12 months | (37,168) | (812)
Allowance for Expected Credit Losses | (5,407) |
Estimated market value | 1,658,050 | 1,754,996
Mortgage-backed securities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Amortized cost | 197,599 | 187,784
Gross Unrealized Gains | 2,485 | 6,011
Gross unrealized losses more than 12 months | (2) | (1)
Gross unrealized losses less than 12 months | (6,031) | (107)
Allowance for Expected Credit Losses | 0 |
Estimated market value | 194,051 | 193,687
Redeemable preferred stocks [Member] |  |
Available-for-sale Securities [Abstract] |  |
Amortized cost | 1,493 | 1,493
Gross Unrealized Gains | 14 | 72
Gross unrealized losses more than 12 months | 0 | 0
Gross unrealized losses less than 12 months | (5) | 0
Allowance for Expected Credit Losses | 0 |
Estimated market value | $ 1,502 | $ 1,565

X
- Definition Amount of accumulated unrealized loss on investments in debt and/or equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or less. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and/or equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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- Definition We used "AvailableForSaleSecuritiesGrossUnrealizedGainLoss" in prior filings for this concept, but the 2013 taxonomy deprecated the above concept and created a new one with the period type changed to 'duration.' We must have an 'instant' period type in order to complete the calculation within this schedule. This is the unrealized gain on all our available-for-sale investments as of the quarter ending date. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details
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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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