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Adjusted Cost and Estimated Market Value Available-for-Sale Investment (Table Text Block) | 12 Months Ended
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Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Adjusted Cost and Estimated Market Value of Available-for-sale Investments | The adjusted cost and estimated market value of available-for-sale investments by contractual maturity, were as follows:
|  | March 31, 2015 |  | March 31, 2014
|  | Amortized Cost |  | Estimated Market Value |  | Amortized Cost |  | Estimated Market Value
|  | (In t housands)
Due in one year or less | $ | 36,355 | $ | 37,055 | $ | 20,235 | $ | 20,475
Due after one year through five years |  | 198,488 |  | 209,404 |  | 185,447 |  | 194,563
Due after five years through ten years |  | 474,639 |  | 492,782 |  | 350,048 |  | 350,953
Due after ten years |  | 472,003 |  | 502,092 |  | 531,645 |  | 521,289
|  | 1,181,485 |  | 1,241,333 |  | 1,087,375 |  | 1,087,280
Mortgage backed securities |  | 19,874 |  | 20,679 |  | 12,425 |  | 12,187
Redeemable preferred stocks |  | 18,052 |  | 18,296 |  | 18,445 |  | 17,533
Equity securities |  | 17,975 |  | 24,654 |  | 17,299 |  | 21,275
| $ | 1,237,386 | $ | 1,304,962 | $ | 1,135,544 | $ | 1,138,275

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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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- Details
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