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Goodwill And Other Intangible Assets (Summary Of Goodwill Activity) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Goodwill [Roll Forward]  
Goodwill, beginning balance $ 6,198us-gaap_Goodwill
Acquired goodwill, net 0us-gaap_GoodwillAcquiredDuringPeriod
Goodwill, ending balance 6,198us-gaap_Goodwill
Community Banking [Member]  
Goodwill [Roll Forward]  
Goodwill, beginning balance 1,488us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= smmf_CommunityBankingMember
Acquired goodwill, net 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= smmf_CommunityBankingMember
Goodwill, ending balance 1,488us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= smmf_CommunityBankingMember
Insurance Services [Member]  
Goodwill [Roll Forward]  
Goodwill, beginning balance 4,710us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= smmf_InsuranceServicesMember
Acquired goodwill, net 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= smmf_InsuranceServicesMember
Goodwill, ending balance $ 4,710us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= smmf_InsuranceServicesMember