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Accounting Policies Accounting Policies (Details) - Minimum | 3 Months Ended
--- | ---
Mar. 31, 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

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | srce_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | srce_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period of sustained performance required to change loan from non-performing to performing. + References 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: |