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Goodwill And Other Intangible Assets (Summary Of Goodwill Activity) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Goodwill [Roll Forward]  
Beginning balance $ 6,198us-gaap_Goodwill
Acquired goodwill, net 0us-gaap_GoodwillAcquiredDuringPeriod
Ending balance 6,198us-gaap_Goodwill
Community Banking [Member]  
Goodwill [Roll Forward]  
Beginning balance 1,488us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= smmf_CommunityBankingMember
Acquired goodwill, net 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= smmf_CommunityBankingMember
Ending balance 1,488us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= smmf_CommunityBankingMember
Insurance Services [Member]  
Goodwill [Roll Forward]  
Beginning balance 4,710us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= smmf_InsuranceServicesMember
Acquired goodwill, net 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= smmf_InsuranceServicesMember
Ending balance $ 4,710us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= smmf_InsuranceServicesMember