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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
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Impaired loans

$ 8,500star_ImpairedLoansReceivableFairValueDisclosure
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Fair value assumptions, expected term

1 year 6 months

Weighted average discount rate

4.70%us-gaap_FairValueInputsDiscountRate
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Loans Receivable Two | Discounted Cash Flow

Quantitative information about Level 3 fair value measures

Number of impaired loans

1star_NumberofImpairedLoans
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Impaired loans

5,200star_ImpairedLoansReceivableFairValueDisclosure
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Loans Receivable Three [Member] | Executed Foreclosure Sale Agreement [Member]

Quantitative information about Level 3 fair value measures

Number of impaired loans

1star_NumberofImpairedLoans
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/ us-gaap_InvestmentTypeAxis
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= star_ExecutedForeclosureSaleAgreementMember

Impaired loans

23,500star_ImpairedLoansReceivableFairValueDisclosure
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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
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= star_DiscountedCashFlowValuationTechniqueMember

Weighted average discount rate

15.00%us-gaap_FairValueInputsDiscountRate
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= star_DiscountedCashFlowValuationTechniqueMember

Impaired real estate

7,100star_ImpairedOtherRealEstateOwnedFairValueDisclosure
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= 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
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^[2]

115,423star_ImpairedLoansReceivableFairValueDisclosure
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Impaired real estate

$ 7,102star_ImpairedOtherRealEstateOwnedFairValueDisclosure
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^[1]

$ 29,936star_ImpairedOtherRealEstateOwnedFairValueDisclosure
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[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.

X

- Definition

Fair Value Assumptions, Weighted Average Expected Term

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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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X

- 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

Number of Impaired Loans

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No definition available.

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- Definition

Number of Impaired Real Estate Assets

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No definition available.

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X

- 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

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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

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