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Loans Receivable and Other Lending Investments, net (Credit Characteristics for Performing Loans) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Financing Receivable, Gross | $ 1,461,499 us-gaap_NotesReceivableGross | $ 1,295,703 us-gaap_NotesReceivableGross
Senior mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Financing Receivable, Gross | 880,769 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember |
Corporate/Partnership loans |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Financing Receivable, Gross | 552,601 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember |
Subordinate mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Financing Receivable, Gross | 28,129 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember |
Real Estate Finance |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Weighted Average Risk Ratings | 3.24 star_WeightedAverageRiskRatings / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 3.23 star_WeightedAverageRiskRatings / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Financing Receivable, Gross | 1,332,558 us-gaap_NotesReceivableGross / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 1,166,465 us-gaap_NotesReceivableGross / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Real Estate Finance | Senior mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Weighted Average Risk Ratings | 2.80 star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 2.73 star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Financing Receivable, Gross | 751,828 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 611,009 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Real Estate Finance | Corporate/Partnership loans |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Weighted Average Risk Ratings | 3.83 star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 3.88 star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Financing Receivable, Gross | 552,601 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 501,620 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Real Estate Finance | Subordinate mortgages |  |
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating |  |
Weighted Average Risk Ratings | 3.61 star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | 2.87 star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Financing Receivable, Gross | $ 28,129 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember | $ 53,836 us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember

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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-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 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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