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Adjusted Cost and Estimated Market Value Available-for-Sale Investment (Table Text Block) | 9 Months Ended
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Dec. 31, 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 December 31, 2012, by contractual maturity, were as follows:
|  | Amortized Cost |  | Estimated Market Value
|  | (Unaudited)
|  | (In thousands)
Due in one year or less | $ | 48,841 | $ | 49,768
Due after one year through five years |  | 168,987 |  | 180,963
Due after five years through ten years |  | 243,324 |  | 263,840
Due after ten years |  | 412,790 |  | 453,000
|  | 873,942 |  | 947,571
Mortgage backed securities |  | 24,597 |  | 25,316
Redeemable preferred stocks |  | 21,353 |  | 22,208
Common stocks |  | 30,866 |  | 24,873
| $ | 950,758 | $ | 1,019,968

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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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