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Investments (Available-for-sale investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Mar. 31, 2021
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Available-for-sale securities, investments: |  |
Amortized cost | $ 2,664,037 | $ 2,405,612
Gross unrealized gains | 170,294 | 250,254
Gross unrealized losses more than 12 months | (445) | (224)
Gross unrealized losses less than 12 months | (12,734) | (783)
Allowance for Expected Credit Losses | (60) | (1,320)
Estimated market value | 2,821,092 | 2,653,539
U.S. treasury securities and government obligations [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 128,078 | 92,429
Gross unrealized gains | 7,984 | 12,941
Gross unrealized losses more than 12 months | 0 | 0
Gross unrealized losses less than 12 months | (969) | 0
Allowance for Expected Credit Losses | 0 | 0
Estimated market value | 135,093 | 105,370
U.S. government agency mortgage-backed securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 44,678 | 61,427
Gross unrealized gains | 280 | 911
Gross unrealized losses more than 12 months | (42) | (1)
Gross unrealized losses less than 12 months | (3,111) | (132)
Allowance for Expected Credit Losses | 0 | 0
Estimated market value | 41,805 | 62,205
Obligations of states and political subdivisions [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 178,040 | 230,521
Gross unrealized gains | 15,450 | 25,249
Gross unrealized losses more than 12 months | 0 | (59)
Gross unrealized losses less than 12 months | (508) | (3)
Allowance for Expected Credit Losses | 0 | 0
Estimated market value | 192,982 | 255,708
Corporate securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 1,989,212 | 1,846,507
Gross unrealized gains | 138,909 | 199,447
Gross unrealized losses more than 12 months | (402) | (163)
Gross unrealized losses less than 12 months | (6,604) | (640)
Allowance for Expected Credit Losses | (60) | (1,320)
Estimated market value | 2,121,055 | 2,043,831
Mortgage-backed securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 324,029 | 174,728
Gross unrealized gains | 7,671 | 11,706
Gross unrealized losses more than 12 months | (1) | (1)
Gross unrealized losses less than 12 months | (1,542) | (8)
Allowance for Expected Credit Losses | 0 | 0
Estimated market value | $ 330,157 | $ 186,425

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- 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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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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=123599081&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=123581744&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=123581744&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=124258926&loc=SL82898722-210454 + Details
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