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Adjusted Cost and Estimated Market Value Available-for-Sale Investment (Table Text Block) | 3 Months Ended
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Jun. 30, 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 June 30, 2013, by contractual maturity, were as follows:
|  | Amortized Cost |  | Estimated Market Value
|  | (Unaudited)
|  | (In thousands)
Due in one year or less | $ | 40,195 | $ | 40,825
Due after one year through five years |  | 172,665 |  | 183,996
Due after five years through ten years |  | 293,659 |  | 315,929
Due after ten years |  | 473,204 |  | 506,488
|  | 979,723 |  | 1,047,238
Mortgage backed securities |  | 6,117 |  | 6,340
Redeemable preferred stocks |  | 21,163 |  | 22,000
Common stocks |  | 43,219 |  | 41,430
| $ | 1,050,222 | $ | 1,117,008

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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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