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Borrowed Funds (Summary Of Long-Term Borrowings) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
Long-term FHLB advances $ 977us-gaap_FederalHomeLoanBankAdvancesLongTerm $ 82,600us-gaap_FederalHomeLoanBankAdvancesLongTerm
Long-term reverse repurchase agreements 72,000smmf_LongTermReverseRepurchaseAgreements 72,000smmf_LongTermReverseRepurchaseAgreements
Term loans 4,513us-gaap_OtherLoansPayableLongTerm 8,916us-gaap_OtherLoansPayableLongTerm
Total $ 77,490us-gaap_LongTermDebt $ 163,516us-gaap_LongTermDebt