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Commitments And Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jul. 25, 2014
action
Loss Contingencies [Line Items]    
Total unfunded commitments $ 126,935smmf_TotalUnfundedCommitments  
Number of causes of action   3smmf_LossContingencyCausesofActionNumber
Revolving Home Equity And Credit Card Lines [Member]    
Loss Contingencies [Line Items]    
Total unfunded commitments 54,768smmf_TotalUnfundedCommitments
/ smmf_TotalUnfundedOrOffBalanceSheetCreditExtensionCommitmentsAxis
= smmf_RevolvingHomeEquityAndCreditCardLinesMember
 
Construction [Member]    
Loss Contingencies [Line Items]    
Total unfunded commitments 24,633smmf_TotalUnfundedCommitments
/ smmf_TotalUnfundedOrOffBalanceSheetCreditExtensionCommitmentsAxis
= us-gaap_ConstructionLoansMember
 
Other Loans [Member]    
Loss Contingencies [Line Items]    
Total unfunded commitments 44,935smmf_TotalUnfundedCommitments
/ smmf_TotalUnfundedOrOffBalanceSheetCreditExtensionCommitmentsAxis
= smmf_OtherLoansMember
 
Standby Letters Of Credit [Member]    
Loss Contingencies [Line Items]    
Total unfunded commitments $ 2,599smmf_TotalUnfundedCommitments
/ smmf_TotalUnfundedOrOffBalanceSheetCreditExtensionCommitmentsAxis
= us-gaap_StandbyLettersOfCreditMember