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Deposits (Summary Of Maturity Distribution Of All Certificates Of Deposit) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deposits [Abstract]    
Three months or less $ 41,931us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess  
Three through six months 38,939us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths  
Six through twelve months 44,588us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months  
Over twelve months 233,758us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreAfter12Months  
Total $ 359,216us-gaap_TimeDeposits100000OrMore $ 391,800us-gaap_TimeDeposits100000OrMore
Three months or less, percentage 11.70%smmf_PercentageOfTimeDeposits100000OrMoreThreeMonthsOrLessToTotalTimeDeposits100000OrMore  
Three through six months, percentage 10.80%smmf_PercentageOfTimeDeposits100000OrMoreThreeMonthsThroughSixMonthsToTotalTimeDeposits100000OrMore  
Six through twelve months, percentage 12.40%smmf_PercentageOfTimeDeposits100000OrMoreSixMonthsThrough12MonthsToTotalTimeDeposits100000OrMore  
Over twelve months, percentage 65.10%smmf_PercentageOfTimeDeposits100000OrMoreAfter12MonthsToTotalTimeDeposits100000OrMore  
Total, percentage 100.00%smmf_PercentageTotalOfMaturityDistributionOfTimeDeposits100000OrMore