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4. Earnings Per Share (Narrative) (Details)	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Anti-dilutive stock options	170,500	289,380

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- Definition

Anti-Dilutive Stock Options

+ References

No definition available.

+ Details

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Namespace Prefix:	smmf_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- Details

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