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Fair Values (Schedule of Fair Value Measurement) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Loan
Dec. 31, 2014
Recurring basis | Quoted market prices in active markets (Level 1)    
Assets and liabilities recorded at fair value    
Available-for-sale securities   $ 7,906us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Recurring basis | Significant other observable inputs (Level 2)    
Assets and liabilities recorded at fair value    
Derivative assets 4,919us-gaap_DerivativeAssets
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= us-gaap_FairValueInputsLevel2Member
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6,361us-gaap_DerivativeAssets
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= us-gaap_FairValueInputsLevel2Member
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= us-gaap_FairValueMeasurementsRecurringMember
Derivative liabilities 910us-gaap_DerivativeLiabilities
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478us-gaap_DerivativeLiabilities
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Recurring basis | Significant unobservable inputs (Level 3)    
Assets and liabilities recorded at fair value    
Available-for-sale securities 1,163us-gaap_AvailableForSaleSecurities
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[1]  
Non-recurring basis | Significant unobservable inputs (Level 3)    
Assets and liabilities recorded at fair value    
Impaired loans 6,362star_ImpairedLoansReceivableFairValueDisclosure
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= us-gaap_FairValueInputsLevel3Member
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[2] 37,169star_ImpairedLoansReceivableFairValueDisclosure
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= us-gaap_FairValueInputsLevel3Member
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= us-gaap_FairValueMeasurementsNonrecurringMember
Impaired real estate   7,102star_ImpairedOtherRealEstateOwnedFairValueDisclosure
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Total | Recurring basis    
Assets and liabilities recorded at fair value    
Derivative assets 4,919us-gaap_DerivativeAssets
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
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6,361us-gaap_DerivativeAssets
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Derivative liabilities 910us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
478us-gaap_DerivativeLiabilities
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Available-for-sale securities 1,163us-gaap_AvailableForSaleSecurities
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[1] 7,906us-gaap_AvailableForSaleSecurities
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
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= us-gaap_FairValueMeasurementsRecurringMember
Total | Non-recurring basis    
Assets and liabilities recorded at fair value    
Impaired loans 6,362star_ImpairedLoansReceivableFairValueDisclosure
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[2] 37,169star_ImpairedLoansReceivableFairValueDisclosure
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Impaired real estate   $ 7,102star_ImpairedOtherRealEstateOwnedFairValueDisclosure
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Discounted Cash Flow Valuation Technique [Member] | Loans Receivable One [Member] | Non-recurring basis    
Assets and liabilities recorded at fair value    
Number of Impaired Loans 1star_NumberofImpairedLoans
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Fair Value Assumptions, Weighted Average Expected Term 1 year 3 months  
Discount rate 4.70%us-gaap_FairValueInputsDiscountRate
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[1] The fair value of the Company's available-for-sale securities are based upon third-party broker quotes.
[2] The Company recorded a recovery of loan losses on one loan with a fair value of $6.4 million based on the loan's remaining term of 1.25 years and interest rate of 4.7% using discounted cash flow analysis.