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Summary of Significant Accounting Policies (Allowance for Loan Losses and Net Investment in Leases (Details) $ in Millions	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)
Accounting Policies [Abstract]
Accrued interest | $	$ 5.0	$ 4.2
Number of impaired loans used as collateral | loan	1

X

- Definition

Loan Portfolio, Accrued Interest After Allowance For Credit Loss

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+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Number of Impaired Loans Used as Collateral

+ References

No definition available.

+ Details

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Namespace Prefix:	star_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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