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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, 2014
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 at March 31, 2014 and 2013, respectively, by contractual maturity, were as follows:
|  | March 31, 2014 |  | March 31, 2013
|  | Amortized Cost |  | Estimated Market Value |  | Amortized Cost |  | Estimated Market Value
|  | (In thousands)
Due in one year or less | $ | 20,235 | $ | 20,475 | $ | 43,658 | $ | 44,333
Due after one year through five years |  | 185,447 |  | 194,563 |  | 180,448 |  | 191,930
Due after five years through ten years |  | 350,048 |  | 350,953 |  | 281,546 |  | 302,188
Due after ten years |  | 531,645 |  | 521,289 |  | 448,169 |  | 486,780
|  | 1,087,375 |  | 1,087,280 |  | 953,821 |  | 1,025,231
Mortgage backed securities |  | 12,425 |  | 12,187 |  | 6,730 |  | 6,985
Redeemable preferred stocks |  | 18,445 |  | 17,533 |  | 23,705 |  | 24,212
Equity securities |  | 17,299 |  | 21,275 |  | 43,729 |  | 38,910
| $ | 1,135,544 | $ | 1,138,275 | $ | 1,027,985 | $ | 1,095,338

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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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