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Loans (Schedule Of Nonaccrual Loans Included In Net Balance Of Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans $ 12,494us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 18,946us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Commercial Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 392us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
1,224us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 1,218us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OwnerOccupiedMember
1,953us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OwnerOccupiedMember
Non Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 626us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonOwnerOccupiedMember
365us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonOwnerOccupiedMember
Land And Land Improvements [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 4,619us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_LandAndLandImprovementsMember
12,830us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_LandAndLandImprovementsMember
Construction Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
Non Jumbo [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 2,663us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
2,446us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
Jumbo [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 2,626us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
Home Equity [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans 267us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans $ 83us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
$ 128us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember