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Loans (Summary Of Loans, Net Of Unearned Fees) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, net of unearned fees $ 1,031,009us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 949,729us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Less allowance for loan losses 11,167us-gaap_LoansAndLeasesReceivableAllowance 12,659us-gaap_LoansAndLeasesReceivableAllowance
Loans, net 1,019,842us-gaap_LoansReceivableNet 937,070us-gaap_LoansReceivableNet
Commercial Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, net of unearned fees 88,590us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
88,352us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, net of unearned fees 157,783us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OwnerOccupiedMember
149,618us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OwnerOccupiedMember
Non Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, net of unearned fees 317,136us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonOwnerOccupiedMember
280,790us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonOwnerOccupiedMember
Land And Land Improvements [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, net of unearned fees 67,881us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_LandAndLandImprovementsMember
71,453us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_LandAndLandImprovementsMember
Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, net of unearned fees 28,591us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
15,155us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
Non Jumbo [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, net of unearned fees 220,071us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
212,946us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
Jumbo [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, net of unearned fees 52,879us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
53,406us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
Home Equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, net of unearned fees 67,115us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
54,844us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Consumer Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, net of unearned fees 19,456us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
19,889us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, net of unearned fees $ 11,507us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember
$ 3,276us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember