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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, 2013
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, 2013 and 2012, respectively, by contractual maturity, were as follows:
|  | March 31, 2013 |  | March 31, 2012
|  | Amortized Cost |  | Estimated Market Value |  | Amortized Cost |  | Estimated Market Value
|  | (In thousands)
Due in one year or less | $ | 43,658 | $ | 44,333 | $ | 40,219 | $ | 40,688
Due after one year through five years |  | 180,448 |  | 191,930 |  | 157,444 |  | 165,852
Due after five years through ten years |  | 281,546 |  | 302,188 |  | 176,694 |  | 188,225
Due after ten years |  | 448,169 |  | 486,780 |  | 291,990 |  | 319,160
|  | 953,821 |  | 1,025,231 |  | 666,347 |  | 713,925
Mortgage backed securities |  | 6,730 |  | 6,985 |  | 11,572 |  | 11,811
Redeemable preferred stocks |  | 23,705 |  | 24,212 |  | 24,370 |  | 23,177
Equity securities |  | 43,729 |  | 38,910 |  | 27,736 |  | 17,879
| $ | 1,027,985 | $ | 1,095,338 | $ | 730,025 | $ | 766,792

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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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