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Investments (Table Text Block) | 3 Months Ended
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Jun. 30, 2016 | Mar. 31, 2016
Investments Debt Equity Securities [Abstract] |  |
Available-for-Sale Investments | Available-for-sale investments at June 30, 2016 were as follows:
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses More than 12 Months |  | Gross Unrealized Losses Less than 12 Months |  | Estimated Market Value
|  | (Unaudited)
|  | (In thousands)
U.S. treasury securities and government obligations | $ | 98,134 | $ | 6,159 | $ | – | $ | (50) | $ | 104,243
U.S. government agency mortgage-backed securities |  | 30,884 |  | 1,741 |  | (5) |  | – |  | 32,620
Obligations of states and political subdivisions |  | 165,322 |  | 14,339 |  | (32) |  | (16) |  | 179,613
Corporate securities |  | 1,232,287 |  | 45,160 |  | (7,890) |  | (16,275) |  | 1,253,282
Mortgage-backed securities |  | 42,850 |  | 855 |  | – |  | (7) |  | 43,698
Redeemable preferred stocks |  | 15,977 |  | 530 |  | – |  | (191) |  | 16,316
Common stocks |  | 17,732 |  | 8,700 |  | (10) |  | (35) |  | 26,387
| $ | 1,603,186 | $ | 77,484 | $ | (7,937) | $ | (16,574) | $ | 1,656,159
| Available-for-sale investments at March 31, 2016 were as follows:
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses More than 12 Months |  | Gross Unrealized Losses Less than 12 Months |  | Estimated Market Value
|  | (In thousands)
U.S. treasury securities and government obligations | $ | 85,861 | $ | 3,791 | $ | – | $ | (193) | $ | 89,459
U.S. government agency mortgage-backed securities |  | 21,845 |  | 1,596 |  | (6) |  | (39) |  | 23,396
Obligations of states and political subdivisions |  | 166,725 |  | 10,660 |  | (81) |  | (414) |  | 176,890
Corporate securities |  | 1,143,125 |  | 26,861 |  | (8,013) |  | (28,181) |  | 1,133,792
Mortgage-backed securities |  | 42,991 |  | 475 |  | – |  | (62) |  | 43,404
Redeemable preferred stocks |  | 17,977 |  | 556 |  | – |  | (105) |  | 18,428
Common stocks |  | 17,732 |  | 7,822 |  | (10) |  | (375) |  | 25,169
| $ | 1,496,256 | $ | 51,761 | $ | (8,110) | $ | (29,369) | $ | 1,510,538
Adjusted Cost and Estimated Market Value of Available-for-sale Investments | The adjusted cost and estimated market value of av ailable-for-sale investments by contractual maturity, were as follows:
|  | June 30, 2016 |  | March 31, 2016
|  | Amortized Cost |  | Estimated Market Value |  | Amortized Cost |  | Estimated Market Value
|  | (Unaudited) |  |  |  |
|  | (In thousands)
Due in one year or less | $ | 31,772 | $ | 32,158 | $ | 48,679 | $ | 49,146
Due after one year through five years |  | 298,190 |  | 307,633 |  | 250,576 |  | 256,597
Due after five years through ten years |  | 628,082 |  | 644,932 |  | 557,984 |  | 557,961
Due after ten years |  | 568,583 |  | 585,035 |  | 560,317 |  | 559,833
|  | 1,526,627 |  | 1,569,758 |  | 1,417,556 |  | 1,423,537
Mortgage backed securities |  | 42,850 |  | 43,698 |  | 42,991 |  | 43,404
Redeemable preferred stocks |  | 15,977 |  | 16,316 |  | 17,977 |  | 18,428
Equity securities |  | 17,732 |  | 26,387 |  | 17,732 |  | 25,169
| $ | 1,603,186 | $ | 1,656,159 | $ | 1,496,256 | $ | 1,510,538

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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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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