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Available-for-Sale Investments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013
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Available-for-sale securities, investments: |  |
Amortized cost | $ 1,135,544 | $ 1,027,985
Gross unrealized gains | 39,491 | 75,734
Gross unrealized losses more than 12 months | (4,192) | (5,311)
Gross unrealized losses less than 12 months | (32,568) | (3,070)
Estimated market value | 1,138,275 | 1,095,338
US Government and Corporate Securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 1,087,375 | 953,821
Estimated market value | 1,087,280 | 1,025,231
U.S. treasury securities and government obligations [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 49,883 | 24,518
Gross unrealized gains | 1,475 | 2,749
Gross unrealized losses more than 12 months |  | (3)
Gross unrealized losses less than 12 months | (1,004) | (3)
Estimated market value | 50,354 | 27,261
U.S. government agency mortgage-backed securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 36,258 | 44,934
Gross unrealized gains | 2,558 | 4,027
Gross unrealized losses more than 12 months | (4) | (7)
Gross unrealized losses less than 12 months | (425) | (73)
Estimated market value | 38,387 | 48,881
Obligations of states and political subdivisions [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 166,311 | 154,692
Gross unrealized gains | 4,834 | 16,056
Gross unrealized losses more than 12 months | (308) | (2)
Gross unrealized losses less than 12 months | (3,627) | (292)
Estimated market value | 167,210 | 170,454
Corporate securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 834,923 | 729,677
Gross unrealized gains | 26,075 | 51,596
Gross unrealized losses more than 12 months | (3,794) | (373)
Gross unrealized losses less than 12 months | (25,875) | (2,265)
Estimated market value | 831,329 | 778,635
Mortgage-backed securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 12,425 | 6,730
Gross unrealized gains | 279 | 282
Gross unrealized losses more than 12 months | (3) | (27)
Gross unrealized losses less than 12 months | (514) |
Estimated market value | 12,187 | 6,985
Redeemable Preferred Stocks [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 18,445 | 23,705
Gross unrealized gains | 283 | 751
Gross unrealized losses more than 12 months | (82) | (214)
Gross unrealized losses less than 12 months | (1,113) | (30)
Estimated market value | 17,533 | 24,212
Common stocks [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 17,299 | 43,729
Gross unrealized gains | 3,987 | 273
Gross unrealized losses more than 12 months | (1) | (4,685)
Gross unrealized losses less than 12 months | (10) | (407)
Estimated market value | $ 21,275 | $ 38,910

X
- Definition Net amount of accumulated unrealized gains (losses) on investments in available-for-sale securities impacted investments. Represents the difference between the fair value and cost of investments in available-for-sale securities. (Recommended by Best Practices guide 1.1.20 dated 10/4/2013, pages 43 through page 48) + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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