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Loans (Schedule Of Recorded Investment Evaluated Based On Aging Status Of Loans And Payment Activity) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Performing Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 365,389smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
$ 341,787smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Performing Financing Receivable [Member] | Non Jumbo [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 217,408smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
210,500smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Performing Financing Receivable [Member] | Jumbo [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 50,253smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
53,406smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Performing Financing Receivable [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 66,848smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
54,844smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Performing Financing Receivable [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 19,373smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
19,761smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Performing Financing Receivable [Member] | Other Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 11,507smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
3,276smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Nonperforming Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 5,639smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
2,574smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Nonperforming Financing Receivable [Member] | Non Jumbo [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 2,663smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
2,446smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Nonperforming Financing Receivable [Member] | Jumbo [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 2,626smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
0smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Nonperforming Financing Receivable [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 267smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
0smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Nonperforming Financing Receivable [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total 83smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
128smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Nonperforming Financing Receivable [Member] | Other Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 0smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
$ 0smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember