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Commitments and Financial Instruments with Off-Balance-Sheet Risk (Details 2) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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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

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- Definition Investments in tax-advantaged and other operating partnerships. + References No definition available. + Details
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Namespace Prefix: | srce_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration