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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

-Paragraph 14

-Subparagraph (a)

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Name Accounting Standards Codification

-Topic 505

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Common Stock Issuances (Details) (USD $)	0 Months Ended	3 Months Ended		0 Months Ended
Common Stock Issuances (Details) (USD $)	Aug. 25, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 17, 2015	Nov. 25, 2014
Subsidiary or Equity Method Investee [Line Items]
Number of shares authorized to sell	256,410smmf_CommonStockSharesAuthorizedtoSell
Share price	$ 9.75us-gaap_SharePrice
Number of common shares issued		237,753
Gross proceeds associated with sale	$ 2,500,000	$ 2,298,000	$ 0
Private Placement [Member]
Subsidiary or Equity Method Investee [Line Items]
Number of shares authorized to sell	1,057,137
Percent of outstanding common stock	9.90%
Share price	$ 9.75
Number of closings	2
Number of common shares issued				237,753	819,384
Aggregate price				$ 2,318,092	$ 7,988,994
Dividend rate				8.00%