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Investments (Table Text Block) | 9 Months Ended | 12 Months Ended
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Dec. 31, 2021 | Mar. 31, 2021
Investments Debt Equity Securities [Abstract] |  |
Available-for-Sale Investments | Amortized Gross Gross Gross Allowance for Expected Credit Losses Estimated (Unaudited) (In thousands) U.S. treasury securities and government obligations $ 118,140 $ 9,039 $ – $ (678) $ – $ 126,501 U.S. government agency mortgage-backed securities 57,083 370 – (2,439) – 55,014 Obligations of states and political subdivisions 191,141 16,734 (80) (474) – 207,321 Corporate securities 2,029,477 157,250 (26) (5,818) – 2,180,883 Mortgage-backed securities 163,430 10,003 (1) – – 173,432 $ 2,559,271 $ 193,396 $ ( 107 )$ ( 9,409 )$ – $ 2,743,151 | Amortized Gross Gross Gross Allowance for Expected Credit Losses Estimated (In thousands) U.S. treasury securities and government obligations $ 92,429 $ 12,941 $ – $ – $ – $ 105,370 U.S. government agency mortgage-backed securities 61,427 911 (1) (132) – 62,205 Obligations of states and political subdivisions 230,521 25,249 (59) (3) – 255,708 Corporate securities 1,846,507 199,447 (163) (641) (1,319) 2,043,831 Mortgage-backed securities 174,728 11,706 (1) (8) – 186,425 $ 2,405,612 $ 250,254 $ ( 224 )$ ( 784 )$ ( 1,319 )$ 2,653,539
Adjusted Cost and Estimated Market Value of Available-for-sale Investments | December 31, 2021 March 31, 2021 Amortized Estimated Amortized Estimated (Unaudited) (In thousands) Due in one year or less $ 69,891 $ 71,172 $ 90,142 $ 91,190 Due after one year through five years 572,812 609,255 562,442 601,818 Due after five years through ten years 677,891 745,523 672,733 754,536 Due after ten years 1,075,247 1,143,769 905,567 1,019,570 2,395,841 2,569,719 2,230,884 2,467,114 Mortgage-backed securities 163,430 173,432 174,728 186,425 $ 2,559,271 $ 2,743,151 $ 2,405,612 $ 2,653,539 |
Available for sale equity investments | December 31, 2021 March 31, 2021 Cost Market Cost Market (Unaudited) (In thousands) Common stocks $ 9,775 $ 24,179 $ 9,775 $ 20,440 Non-redeemable preferred stocks 26,054 28,112 20,034 21,677 $ 35,829 $ 52,291 $ 29,809 $ 42,117 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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