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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical)	Jul. 22, 2015
Income Statement [Abstract]
Common stock dividend rate	10.00%

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- Definition

Common Stock, Dividend Rate, Percentage

+ References

No definition available.

+ Details

Name:	srce_CommonStockDividendRatePercentage
Namespace Prefix:	srce_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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