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Borrowed Funds (Summary Of The Maturities Of All Long-Term Borrowings And Subordinated Debentures) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Total $ 77,013us-gaap_LongTermDebt $ 77,490us-gaap_LongTermDebt $ 123,492us-gaap_LongTermDebt
Long-term Debt [Member]      
2015 1,432us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
   
2016 28,911us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
   
2017 918us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
   
2018 45,017us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
   
2019 18us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
   
Thereafter 717us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
   
Total 77,013us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
   
Subordinated debentures [Member]      
2015 5,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
   
2016 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
   
2017 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
   
2018 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
   
2019 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
   
Thereafter 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
   
Total 5,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
   
Subordinated debentures owed to unconsolidated subsidiary trusts [Member]      
2015 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_LongtermDebtTypeAxis
= smmf_SubordinatedDebenturesOwedToUnconsolidatedSubsidiaryTrustsMember
   
2016 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= smmf_SubordinatedDebenturesOwedToUnconsolidatedSubsidiaryTrustsMember
   
2017 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= smmf_SubordinatedDebenturesOwedToUnconsolidatedSubsidiaryTrustsMember
   
2018 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= smmf_SubordinatedDebenturesOwedToUnconsolidatedSubsidiaryTrustsMember
   
2019 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_LongtermDebtTypeAxis
= smmf_SubordinatedDebenturesOwedToUnconsolidatedSubsidiaryTrustsMember
   
Thereafter 19,589us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_LongtermDebtTypeAxis
= smmf_SubordinatedDebenturesOwedToUnconsolidatedSubsidiaryTrustsMember
   
Total $ 19,589us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= smmf_SubordinatedDebenturesOwedToUnconsolidatedSubsidiaryTrustsMember