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Accounting Policies Accounting Policies (Details) - Minimum	6 Months Ended
	Jun. 30, 2016 USD ($)
Summary of Significant Accounting Policies [Line Items]
Period of sustained performance required to change from non-performing to performing status	6 months
Amount necessary for impairment evaluation	$ 100,000

X

- Definition

Minimum loan or lease amount necessary for impairment evaluation. An allowance is only created if it is possible that all amounts due will not be collected pursuant to the contractual terms of the loan or lease and the recorded investment in the loan or lease exceeds its fair value.

+ References

No definition available.

+ Details

Name:	srce_Amountnecessaryforimpairmentevaluation
Namespace Prefix:	srce_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

-- None. No documentation exists for this element. --

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No definition available.

+ Details

Name:	srce_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix:	srce_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period of sustained performance required to change loan from non-performing to performing.

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No definition available.

+ Details

Name:	srce_SustainedPerformancePeriodRequiredForPerformingStatus
Namespace Prefix:	srce_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: