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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, 2012
Investments, Debt and Equity Securities [Abstract] |
Investments classified by contractual maturity date | The adjusted cost and estimated market value of available-for-sale investments at September 30, 2012, by contractual maturity, were as follows:
|  | Amortized Cost |  |  | Estimated Market Value |
|  | (Unaudited) |
|  | (In thousands) |
Due in one year or less |  | $ | 51,141 |  |  | $ | 52,289 |
Due after one year through five years |  |  | 148,038 |  |  |  | 157,500 |
Due after five years through ten years |  |  | 217,112 |  |  |  | 233,269 |
Due after ten years |  |  | 368,697 |  |  |  | 401,347 |
|  |  | 784,988 |  |  |  | 844,405 |
Mortgage backed securities |  |  | 18,244 |  |  |  | 18,654 |
Redeemable preferred stocks |  |  | 24,147 |  |  |  | 24,558 |
Common stocks |  |  | 27,762 |  |  |  | 16,829 |
|  | $ | 855,141 |  |  | $ | 904,446 |

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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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