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Borrowed Funds (Short-term Borrowings) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Debt Disclosure [Abstract]  
Borrowing availability through credit lines and Federal funds purchased agreements $ 97.5smmf_BorrowingAvailabilityThroughCreditLinesAndFederalFundsPurchasedAgreements