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Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563 false2Other than temporary impairment3false 4us-gaap_RealizedInvestmentGainsLossesus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse556000556USD$falsefalsefalse2truefalsefalse69950006995USD$falsefalsefalse3truefalsefalse1282300012823USD$falsefalsefalse4truefalsefalse2061500020615USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Subparagraph a -Article 7 false2Realized gains, net4false 4us-gaap_InterestExpenseus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse2146300021463USD$falsefalsefalse2truefalsefalse2888100028881USD$falsefalsefalse3truefalsefalse3981700039817USD$falsefalsefalse4truefalsefalse5953600059536USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of the cost of borrowed funds accounted for as interest expense.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 false2Total interest expense5false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5false USDtruefalse$eol_PE798-----1310-Q0007_STD_91_20130630_0_708196x710451_709650x725923http://www.sec.gov/CIK0000930236duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseReclassification out of Accumulated Other Comprehensive Incomeus-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxisexplicitMemberfalsefalseAccumulated Investment Gain (Loss)us-gaap_StatementEquityComponentsAxisxbrldihttp://xbrl.org/2006/xbrldirwt_AccumulatedInvestmentGainLossMemberus-gaap_StatementEquityComponentsAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Reclassification out of Accumulated Other Comprehensive Income | Accumulated Investment Gain (Loss)6true 3us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]7false 4us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-133000-133USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-124000-124USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. 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