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Loans Loans (Activity for Related Party Loans of $60,000 or More) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Loans and Leases Receivable, Related Parties [Roll Forward]    
Balance, beginning $ 18,577us-gaap_LoansAndLeasesReceivableRelatedParties $ 18,973us-gaap_LoansAndLeasesReceivableRelatedParties
Additions 13,842us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions 7,978us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
Amounts collected (11,833)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections (8,317)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
Other changes, net 0smmf_LoansandLeasesReceivableRelatedPartiesOtherChangesNet (57)smmf_LoansandLeasesReceivableRelatedPartiesOtherChangesNet
Balance, ending $ 20,586us-gaap_LoansAndLeasesReceivableRelatedParties $ 18,577us-gaap_LoansAndLeasesReceivableRelatedParties