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Available-for-Sale Investments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Mar. 31, 2012
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Available-for-sale securities, investments: |  |
Amortized cost | $ 754,941 |
Gross unrealized gains | 53,144 |
Gross unrealized losses more than 12 months | (12,822) |
Gross unrealized losses less than 12 months | (1,881) |
Estimated market value | 793,382 | 766,792
U.S. treasury, government, and corporate securities |  |
Available-for-sale securities, investments: |  |
Amortized cost | 694,950 |
Gross unrealized gains | 51,673 |
Gross unrealized losses more than 12 months | (315) |
Gross unrealized losses less than 12 months | (1,832) |
Estimated market value | 744,476 |
U.S. treasury securities and government obligation |  |
Available-for-sale securities, investments: |  |
Amortized cost | 28,722 |
Gross unrealized gains | 2,510 |
Gross unrealized losses more than 12 months | (4) |
Gross unrealized losses less than 12 months | (8) |
Estimated market value | 31,220 |
U.S. government agency mortgage-backed securities |  |
Available-for-sale securities, investments: |  |
Amortized cost | 46,507 |
Gross unrealized gains | 4,615 |
Gross unrealized losses more than 12 months | 0 |
Gross unrealized losses less than 12 months | (7) |
Estimated market value | 51,115 |
Obligations of states and political subdivisions |  |
Available-for-sale securities, investments: |  |
Amortized cost | 146,121 |
Gross unrealized gains | 11,481 |
Gross unrealized losses more than 12 months | 0 |
Gross unrealized losses less than 12 months | (151) |
Estimated market value | 157,451 |
Corporate securities |  |
Available-for-sale securities, investments: |  |
Amortized cost | 473,600 |
Gross unrealized gains | 33,067 |
Gross unrealized losses more than 12 months | (311) |
Gross unrealized losses less than 12 months | (1,666) |
Estimated market value | 504,690 |
Mortgage-backed securities |  |
Available-for-sale securities, investments: |  |
Amortized cost | 8,885 |
Gross unrealized gains | 269 |
Gross unrealized losses more than 12 months | (15) |
Gross unrealized losses less than 12 months | (1) |
Estimated market value | 9,138 |
Redeemable preferred stock |  |
Available-for-sale securities, investments: |  |
Amortized cost | 23,370 |
Gross unrealized gains | 1,155 |
Gross unrealized losses more than 12 months | (547) |
Gross unrealized losses less than 12 months | (43) |
Estimated market value | 23,935 |
Common stock |  |
Available-for-sale securities, investments: |  |
Amortized cost | 27,736 |
Gross unrealized gains | 47 |
Gross unrealized losses more than 12 months | (11,945) |
Gross unrealized losses less than 12 months | (5) |
Estimated market value | $ 15,833 |

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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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=6872113&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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=6872113&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=6872113&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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=6872113&loc=d3e27290-111563 + Details
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- Definition The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (d) -SubTopic 10 -Topic 320 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + 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 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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=6872113&loc=d3e27161-111563 Reference 4: 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 + Details
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