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Commitments and Financial Instruments with Off-Balance-Sheet Risk (Details 2) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Investments in tax-advantaged and other operating partnerships	$ 14,390	$ 23,760
Tax-advantaged and other operating partnerships commitment	$ 15,240	$ 15,710

X

- Definition

Investments in tax-advantaged and other operating partnerships.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of commitment or contingent commitments to tax-advantaged and other operating partnerships.

+ References

No definition available.

+ Details

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Namespace Prefix:	srce_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration