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Investments (Table Text Block) | 9 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Mar. 31, 2019
Investments Debt Equity Securities [Abstract] |  |
Available-for-Sale Investments | Available-for-sale investments as of December 31, 2019 were as follows: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses More than 12 Months Gross Unrealized Losses Less than 12 Months Estimated Market Value (Unaudited) (In thousands) U.S. treasury securities and government obligations $ 112,784 $ 9,370 $ (3) $ – $ 122,151 U.S. government agency mortgage-backed securities 39,146 887 (2) – 40,031 Obligations of states and political subdivisions 292,619 23,669 (134) (45) 316,109 Corporate securities 1,699,751 102,544 (1,133) (528) 1,800,634 Mortgage-backed securities 153,880 7,602 (1) (2) 161,479 Redeemable preferred stocks 1,493 82 – – 1,575 $ 2,299,673 $ 144,154 $ (1,273) $ (575) $ 2,441,979 | 9 Available-for-sale investments as of March 31, 2019 were as follows: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses More than 12 Months Gross Unrealized Losses Less than 12 Months Estimated Market Value (In thousands) U.S. treasury securities and government obligations $ 136,010 $ 2,409 $ (2,104) $ (447) $ 135,868 U.S. government agency mortgage-backed securities 31,101 433 (146) (19) 31,369 Obligations of states and political subdivisions 298,955 8,079 (233) (905) 305,896 Corporate securities 1,613,199 14,777 (14,257) (24,986) 1,588,733 Mortgage-backed securities 148,203 880 (285) (903) 147,895 Redeemable preferred stocks 1,493 20 – (45) 1,468 $ 2,228,961 $ 26,598 $ (17,025) $ (27,305) $ 2,211,229
Adjusted Cost and Estimated Market Value of Available-for-sale Investments | December 31, 2019 March 31, 2019 Amortized Cost Estimated Market Value Amortized Cost Estimated Market Value (Unaudited) (In thousands) Due in one year or less $ 114,557 $ 115,001 $ 71,987 $ 71,954 Due after one year through five years 554,591 572,647 541,195 540,658 Due after five years through ten years 662,534 707,015 621,031 614,485 Due after ten years 812,618 884,262 845,052 834,769 2,144,300 2,278,925 2,079,265 2,061,866 Mortgage-backed securities 153,880 161,479 148,203 147,895 Redeemable preferred stocks 1,493 1,575 1,493 1,468 $ 2,299,673 $ 2,441,979 $ 2,228,961 $ 2,211,229 |
Available for sale equity investments | Equity investments of common stock and non-redeemable preferred stock were as follows: December 31, 2019 March 31, 2019 Amortized Cost Estimated Market Value Amortized Cost Estimated Market Value (Unaudited) (In thousands) Common stocks $ 9,775 $ 19,988 $ 10,123 $ 17,379 Non-redeemable preferred stocks 7,451 7,501 7,451 6,789 $ 17,226 $ 27,489 $ 17,574 $ 24,168 |

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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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