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Fair Values (Schedule of Fair Value Measurement Assumptions) (Details) (Non-recurring basis, USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 Loan | Dec. 31, 2013
Loans Receivable One | Discounted Cash Flow |  |  |
Quantitative information about Level 3 fair value measures |  |  |
Number of impaired loans | 1star_NumberofImpairedLoans / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_InvestmentTypeAxis = star_LoansReceivableOneMember / us-gaap_ValuationTechniqueAxis = star_DiscountedCashFlowValuationTechniqueMember |  |
Impaired loans | $ 8,500star_ImpairedLoansReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_InvestmentTypeAxis = star_LoansReceivableOneMember / us-gaap_ValuationTechniqueAxis = star_DiscountedCashFlowValuationTechniqueMember |  |
Fair value assumptions, expected term | 1 year 6 months |  |
Weighted average discount rate | 4.70%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_InvestmentTypeAxis = star_LoansReceivableOneMember / us-gaap_ValuationTechniqueAxis = star_DiscountedCashFlowValuationTechniqueMember |  |
Loans Receivable Two | Discounted Cash Flow |  |  |
Quantitative information about Level 3 fair value measures |  |  |
Number of impaired loans | 1star_NumberofImpairedLoans / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_InvestmentTypeAxis = star_LoansReceivableTwoMember / us-gaap_ValuationTechniqueAxis = star_DiscountedCashFlowValuationTechniqueMember |  |
Impaired loans | 5,200star_ImpairedLoansReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_InvestmentTypeAxis = star_LoansReceivableTwoMember / us-gaap_ValuationTechniqueAxis = star_DiscountedCashFlowValuationTechniqueMember |  |
Loans Receivable Three [Member] | Executed Foreclosure Sale Agreement [Member] |  |  |
Quantitative information about Level 3 fair value measures |  |  |
Number of impaired loans | 1star_NumberofImpairedLoans / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_InvestmentTypeAxis = star_LoansReceivableThreeMember / us-gaap_ValuationTechniqueAxis = star_ExecutedForeclosureSaleAgreementMember |  |
Impaired loans | 23,500star_ImpairedLoansReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_InvestmentTypeAxis = star_LoansReceivableThreeMember / us-gaap_ValuationTechniqueAxis = star_ExecutedForeclosureSaleAgreementMember |  |
Land | Discounted Cash Flow |  |  |
Quantitative information about Level 3 fair value measures |  |  |
Number of impaired real estate assets | 1star_NumberofImpairedRealEstateAssets / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_LandMember / us-gaap_ValuationTechniqueAxis = star_DiscountedCashFlowValuationTechniqueMember |  |
Weighted average discount rate | 15.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_LandMember / us-gaap_ValuationTechniqueAxis = star_DiscountedCashFlowValuationTechniqueMember |  |
Impaired real estate | 7,100star_ImpairedOtherRealEstateOwnedFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_LandMember / us-gaap_ValuationTechniqueAxis = star_DiscountedCashFlowValuationTechniqueMember | [1] |
Fair Value Assumptions, Expected Term | 10 years |  |
Significant unobservable inputs (Level 3) |  |  |
Quantitative information about Level 3 fair value measures |  |  |
Impaired loans | 37,169star_ImpairedLoansReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [2] | 115,423star_ImpairedLoansReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Impaired real estate | $ 7,102star_ImpairedOtherRealEstateOwnedFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1] | $ 29,936star_ImpairedOtherRealEstateOwnedFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
[1] | The Company recorded impairment on one real estate asset with a fair value of $7.1 million based on a discount rate of 15.0% using discounted cash flows over a 10 year lease term.
[2] | The Company recorded a recovery of loan losses on one loan with a fair value of $8.5 million based on the loan's remaining term of 1.50 years and interest rate of 4.7% using discounted cash flow analysis. The Company also recorded a provision for loan losses on one loan with a fair value of $5.2 million based on an appraisal.

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- Definition This element represents impaired loans as of the end of the reporting period that are valued by the entity at fair value on the balance sheet date. + References No definition available. + Details
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- Definition This element represents impaired OREOs held by the Company as of the end of the reporting period that are valued by the entity at fair value on the balance sheet date. + References No definition available. + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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