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Loans (Summary Of Loans, Net Of Unearned Fees) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned fees $ 1,050,496us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 1,031,009us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 973,783us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Less allowance for loan losses 10,827us-gaap_LoansAndLeasesReceivableAllowance 11,167us-gaap_LoansAndLeasesReceivableAllowance 11,069us-gaap_LoansAndLeasesReceivableAllowance
Loans, net 1,039,669us-gaap_LoansReceivableNet 1,019,842us-gaap_LoansReceivableNet 962,714us-gaap_LoansReceivableNet
Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned fees 89,928us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
88,590us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
93,517us-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 180,269us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OwnerOccupiedMember
157,783us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OwnerOccupiedMember
150,025us-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 325,764us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonOwnerOccupiedMember
317,136us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonOwnerOccupiedMember
297,197us-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 66,558us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_LandAndLandImprovementsMember
67,881us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_LandAndLandImprovementsMember
67,342us-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 19,094us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
28,591us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
18,327us-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 219,938us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
220,071us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
215,665us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_NonJumboMember
Jumbo [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned fees 50,492us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
52,879us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
51,406us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_JumboMember
Home Equity [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned fees 68,894us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
67,115us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
56,161us-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 18,485us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
19,456us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
19,106us-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 $ 11,074us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember
$ 11,507us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember
$ 5,037us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= smmf_OtherLoansMember