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Adjusted Cost and Estimated Market Value Available-for-Sale Investment (Table Text Block) | 6 Months Ended
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Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract] |
Adjusted Cost and Estimated Market Value of Available-for-sale Investments |
|  | September 30, 2014 |  | March 31, 2014
|  | Amortized Cost |  | Estimated Market Value |  | Amortized Cost |  | Estimated Market Value
|  | (Unaudited) |  | (Unaudited)
|  | (In thousands) |  | (In thousands)
Due in one year or less | $ | 40,037 | $ | 41,254 | $ | 20,235 | $ | 20,475
Due after one year through five years |  | 225,426 |  | 239,240 |  | 185,447 |  | 194,563
Due after five years through ten years |  | 472,125 |  | 495,392 |  | 350,048 |  | 350,953
Due after ten years |  | 410,410 |  | 426,455 |  | 531,645 |  | 521,289
|  | 1,147,998 |  | 1,202,341 |  | 1,087,375 |  | 1,087,280
Mortgage backed securities |  | 16,817 |  | 17,253 |  | 12,425 |  | 12,187
Redeemable preferred stocks |  | 17,448 |  | 17,721 |  | 18,445 |  | 17,533
Common stocks |  | 17,975 |  | 22,816 |  | 17,299 |  | 21,275
| $ | 1,200,238 | $ | 1,260,131 | $ | 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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