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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
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total $ 364,327smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
$ 365,389smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
$ 344,412smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Performing Financing Receivable [Member] | Non-Jumbo [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 216,509smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
217,408smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
213,071smmf_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 49,779smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
50,253smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
51,406smmf_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 68,545smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
66,848smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
55,865smmf_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 18,420smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
19,373smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
19,033smmf_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 11,074smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
11,507smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
5,037smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 4,556smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
5,639smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
2,963smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Nonperforming Financing Receivable [Member] | Non-Jumbo [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total 3,429smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
2,663smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
2,594smmf_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 713smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
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 349smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
267smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
296smmf_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 65smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
83smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
73smmf_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
$ 0smmf_FinancingReceivableCreditQualityRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember