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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets    
Allowance for loan losses $ 4,128us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses $ 4,681us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Depreciation 168smmf_DeferredTaxAssetsDepreciation 135smmf_DeferredTaxAssetsDepreciation
Foreclosed properties 5,197us-gaap_DeferredTaxAssetsOther 4,928us-gaap_DeferredTaxAssetsOther
Deferred compensation 2,265us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 2,006us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Other deferred costs and accrued expenses 349us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 371us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Other-than-temporarily impaired securities 257us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses 931us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Net unrealized loss on securities available for sale 0us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross 308us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Net unrealized loss on interest rate swaps 1,077us-gaap_DeferredTaxAssetsDerivativeInstruments 0us-gaap_DeferredTaxAssetsDerivativeInstruments
NOL and tax credit carryforwards 37us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 404us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Total 13,478us-gaap_DeferredTaxAssetsGross 13,764us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities    
Accretion on tax-exempt securities 8smmf_DeferredTaxLiabilitiesAccretionOnTaxExemptSecurities 6smmf_DeferredTaxLiabilitiesAccretionOnTaxExemptSecurities
Net unrealized gain on securities available for sale 2,297smmf_DeferredTaxLiabilitiesUnrealizedLossOnAvailableForSaleSecurities 0smmf_DeferredTaxLiabilitiesUnrealizedLossOnAvailableForSaleSecurities
Net unrealized gain on interest rate swaps 0us-gaap_DeferredTaxLiabilitiesDerivatives 297us-gaap_DeferredTaxLiabilitiesDerivatives
Purchase accounting adjustments and goodwill 806smmf_DeferredTaxLiabilitiesPurchaseAccountingAdjustmentsAndGoodwill 869smmf_DeferredTaxLiabilitiesPurchaseAccountingAdjustmentsAndGoodwill
Total 3,111us-gaap_DeferredIncomeTaxLiabilities 1,172us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets $ 10,367us-gaap_DeferredTaxAssetsLiabilitiesNet $ 12,592us-gaap_DeferredTaxAssetsLiabilitiesNet