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Borrowed Funds (Summary Of Long-Term Borrowings) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Debt Disclosure [Abstract]      
Long-term FHLB advances $ 951us-gaap_FederalHomeLoanBankAdvancesLongTerm $ 977us-gaap_FederalHomeLoanBankAdvancesLongTerm $ 42,576us-gaap_FederalHomeLoanBankAdvancesLongTerm
Long-term reverse repurchase agreements 72,000smmf_LongTermReverseRepurchaseAgreements 72,000smmf_LongTermReverseRepurchaseAgreements 72,000smmf_LongTermReverseRepurchaseAgreements
Term loans 4,062us-gaap_OtherLoansPayableLongTerm 4,513us-gaap_OtherLoansPayableLongTerm 8,916us-gaap_OtherLoansPayableLongTerm
Total $ 77,013us-gaap_LongTermDebt $ 77,490us-gaap_LongTermDebt $ 123,492us-gaap_LongTermDebt