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Deposits (Summary Of Maturity Distribution Of All Certificates Of Deposit) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Deposits [Abstract]  
Three months or less $ 42,686us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess
Three through six months 25,577us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths
Six through twelve months 58,303us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months
Over twelve months 232,072us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreAfter12Months
Total $ 358,638us-gaap_TimeDeposits100000OrMore
Three months or less, percentage 11.90%smmf_PercentageOfTimeDeposits100000OrMoreThreeMonthsOrLessToTotalTimeDeposits100000OrMore
Three through six months, percentage 7.10%smmf_PercentageOfTimeDeposits100000OrMoreThreeMonthsThroughSixMonthsToTotalTimeDeposits100000OrMore
Six through twelve months, percentage 16.30%smmf_PercentageOfTimeDeposits100000OrMoreSixMonthsThrough12MonthsToTotalTimeDeposits100000OrMore
Over twelve months, percentage 64.70%smmf_PercentageOfTimeDeposits100000OrMoreAfter12MonthsToTotalTimeDeposits100000OrMore
Total, percentage 100.00%smmf_PercentageTotalOfMaturityDistributionOfTimeDeposits100000OrMore