2.4.0.8025 - Disclosure - Note 4 - Investments (Details) - Available-for-sale Securitiestruefalsefalse1false USDfalsefalse$c8_From1Jan2013To30Jun2013http://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$c87_From1Jan2012To31Dec2012http://www.sec.gov/CIK0000055362duration2012-01-01T00:00:002012-12-31T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]2false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse2638822726388227USD$falsetruefalse2truefalsefalse4432859644328596USD$falsetruefalsexbrli:monetaryItemTypemonetaryAmount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Gains3false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLossus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse40377824037782USD$falsefalsefalse2truefalsefalse105974105974USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Losses4false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse425005449425005449USD$falsefalsefalse2truefalsefalse439710050439710050USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value5false 4us-gaap_AvailableForSaleSecuritiesAmortizedCostus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse402655004402655004USD$falsefalsefalse2truefalsefalse395487428395487428USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 false2Amortized Cost6false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3false USDtruefalse$c42_From1Jan2013To30Jun2013_USGovernmentAgenciesDebtSecuritiesMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseUS Government Agencies Debt Securities [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USGovernmentAgenciesDebtSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0US Government Agencies Debt Securities [Member]7true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]8false 4us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse4476262644762626USD$falsefalsefalse2truefalsefalse4763495247634952USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.No definition available.false2Amortized Cost9false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse18199801819980USD$falsefalsefalse2truefalsefalse42639204263920USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Gains10false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLossus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse170755170755USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Losses11false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse4641185146411851USD$falsefalsefalse2truefalsefalse5189887251898872USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value12false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse5false USDtruefalse$c44_From1Jan2013To30Jun2013_USStatesAndPoliticalSubdivisionsMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseUS States and Political Subdivisions Debt Securities [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_USStatesAndPoliticalSubdivisionsMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0US States and Political Subdivisions Debt Securities [Member]13true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]14false 4us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse4413663844136638USD$falsefalsefalse2truefalsefalse4632348746323487USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of debt 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.No definition available.false2Amortized Cost15false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse45610334561033USD$falsefalsefalse2truefalsefalse75229977522997USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Gains16false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLossus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse2649026490USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Losses17false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse4867118148671181USD$falsefalsefalse2truefalsefalse5384648453846484USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value18false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse7false USDtruefalse$c46_From1Jan2013To30Jun2013_CorporateDebtSecuritiesMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseCorporate Debt Securities [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CorporateDebtSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Corporate Debt Securities [Member]19true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]20false 4us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse218305810218305810USD$falsefalsefalse2truefalsefalse207553209207553209USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.No definition available.false2Amortized Cost21false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse1463212014632120USD$falsefalsefalse2truefalsefalse2381864023818640USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Gains22false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLossus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse19722961972296USD$falsefalsefalse2truefalsefalse9376593765USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Losses23false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse230965634230965634USD$falsefalsefalse2truefalsefalse231278084231278084USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value24false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse9false USDtruefalse$c48_From1Jan2013To30Jun2013_ForeignMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseForeign [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldiihrc_ForeignMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Foreign [Member]25true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]26false 4us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse5286586652865866USD$falsefalsefalse2truefalsefalse5000042050000420USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.No definition available.false2Amortized Cost27false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse27286442728644USD$falsefalsefalse2truefalsefalse47481304748130USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Gains28false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLossus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse14189401418940USD$falsefalsefalse2truefalsefalse1168011680USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Losses29false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse5417557054175570USD$falsefalsefalse2truefalsefalse5473687054736870USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value30false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse11false USDtruefalse$c50_From1Jan2013To30Jun2013_AssetBackedSecuritiesMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseAsset-backed Securities [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AssetBackedSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Asset-backed Securities [Member]31true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]32false 4us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse40845604084560USD$falsefalsefalse2truefalsefalse44600904460090USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.No definition available.false2Amortized Cost33false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse185903185903USD$falsefalsefalse2truefalsefalse289373289373USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Gains34false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLossus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2truefalsefalse529529USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Losses35false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse42704634270463USD$falsefalsefalse2truefalsefalse47489344748934USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value36false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse13false USDtruefalse$c52_From1Jan2013To30Jun2013_CommercialMortgageBackedSecuritiesMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseCommercial Mortgage Backed Securities [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialMortgageBackedSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Commercial Mortgage Backed Securities [Member]37true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]38false 4us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse56011265601126USD$falsefalsefalse2truefalsefalse64296416429641USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of debt 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.No definition available.false2Amortized Cost39false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse235998235998USD$falsefalsefalse2truefalsefalse407386407386USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Gains40false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLossus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse2929USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Losses41false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse58370955837095USD$falsefalsefalse2truefalsefalse68370276837027USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value42false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse15false USDtruefalse$c54_From1Jan2013To30Jun2013_ResidentialMortgageBackedSecuritiesMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseResidential Mortgage Backed Securities [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ResidentialMortgageBackedSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Residential Mortgage Backed Securities [Member]43true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]44false 4us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse2695507126955071USD$falsefalsefalse2truefalsefalse3196857831968578USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.No definition available.false2Amortized Cost45false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse19325531932553USD$falsefalsefalse2truefalsefalse30085643008564USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Gains46false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse2888762428887624USD$falsefalsefalse2truefalsefalse3497714234977142USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value47false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse17false USDtruefalse$c56_From1Jan2013To30Jun2013_RedeemablePreferredStockMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseRedeemable Preferred Stock [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_RedeemablePreferredStockMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Redeemable Preferred Stock [Member]48true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]49false 4us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse691665691665USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of debt 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.No definition available.false2Amortized Cost50false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLossus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse3500835008USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Losses51false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse656657656657USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value52false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse18false USDtruefalse$c57_From1Jan2013To30Jun2013_DebtSecuritiesMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseDebt Securities [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Debt Securities [Member]53true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]54false 4us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse397403362397403362USD$falsefalsefalse2truefalsefalse394370377394370377USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of debt 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.No definition available.false2Amortized Cost55false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse2609623126096231USD$falsefalsefalse2truefalsefalse4405901044059010USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Gains56false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLossus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse36235183623518USD$falsefalsefalse2truefalsefalse105974105974USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Losses57false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse419876075419876075USD$falsefalsefalse2truefalsefalse438323413438323413USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value58false 4us-gaap_AvailableForSaleSecuritiesAmortizedCostus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse397403362397403362USD$falsefalsefalse2truefalsefalse394370377394370377USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis 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.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 false2Amortized Cost59false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse20false USDtruefalse$c58_AsOf30Jun2013_USAgenciesMemberhttp://www.sec.gov/CIK0000055362instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseUS Agencies [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldiihrc_USAgenciesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0US Agencies [Member]60true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]61false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse687000687000USD$falsefalsefalse2truefalsefalse681300681300USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value62false 4us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse687000687000USD$falsefalsefalse2truefalsefalse681300681300USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.No definition available.false2Amortized Cost63false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse22false USDtruefalse$c60_From1Jan2013To30Jun2013_MutualFundsMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseMutual Funds [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldiihrc_MutualFundsMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Mutual Funds [Member]64true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]65false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse1492814928USD$falsefalsefalse2truefalsefalse30543054USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Gains66false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse333211333211USD$falsefalsefalse2truefalsefalse321337321337USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value67false 4us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse318283318283USD$falsefalsefalse2truefalsefalse318283318283USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.No definition available.false2Amortized Cost68false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse24false USDtruefalse$c62_From1Jan2013To30Jun2013_CommonStockMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseCommon Stock [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommonStockMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Common Stock [Member]69true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]70false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse277068277068USD$falsefalsefalse2truefalsefalse266532266532USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Gains71false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLossus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse406356406356USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Losses72false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse39618033961803USD$falsefalsefalse2truefalsefalse384000384000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value73false 4us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse40910914091091USD$falsefalsefalse2truefalsefalse117468117468USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.No definition available.false2Amortized Cost74false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse26false USDtruefalse$c64_From1Jan2013To30Jun2013_NonredeemablePreferredStockMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseNonredeemable Preferred Stock [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_NonredeemablePreferredStockMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Nonredeemable Preferred Stock [Member]75true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]76false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLossus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse79087908USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Losses77false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse147360147360USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value78false 4us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse155268155268USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.No definition available.false2Amortized Cost79false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse27false USDtruefalse$c65_From1Jan2013To30Jun2013_EquitySecuritiesMemberhttp://www.sec.gov/CIK0000055362duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseEquity Securities [Member]us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_MajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Equity Securities [Member]80true 3ihrc_Note4InvestmentsDetailsAvailableforsaleSecuritiesLineItemsihrc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Note 4 - Investments (Details) - Available-for-sale Securities [Line Items]81false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse291996291996USD$falsefalsefalse2truefalsefalse269586269586USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Gains82false 4us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLossus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse414264414264USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 false2Gross Unrealized Losses83false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse51293745129374USD$falsefalsefalse2truefalsefalse13866371386637USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value84false 4us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasisus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse52516425251642USD$falsefalsefalse2truefalsefalse11170511117051USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.No definition available.false2Amortized Cost85false 4us-gaap_AvailableForSaleSecuritiesAmortizedCostus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse52516425251642USD$falsetruefalse2truefalsefalse11170511117051USD$falsetruefalsexbrli:monetaryItemTypemonetaryThis 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.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 false2Amortized CostfalseNote 4 - Investments (Details) - Available-for-sale Securities (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.investorsheritage.com/role/AvailableforsaleSecuritiesTable285