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Borrowed Funds (Summary Of Short-Term Borrowings) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Debt Instrument [Line Items]      
Beginning Balance $ 148,985us-gaap_ShortTermBorrowings $ 68,974us-gaap_ShortTermBorrowings $ 123,633us-gaap_ShortTermBorrowings [1]
Short-term FHLB Advances [Member]      
Debt Instrument [Line Items]      
Beginning Balance 141,550us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
60,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
120,950us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Average balance outstanding for the period 139,590us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
66,205us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
94,982us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Maximum balance outstanding at any month end during period 141,780us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
80,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
136,800us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Weighted average interest rate for the period 0.31%smmf_WeightedAverageInterestRateForPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
0.28%smmf_WeightedAverageInterestRateForPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
0.31%smmf_WeightedAverageInterestRateForPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Weighted average interest rate for balances outstanding 0.32%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
0.31%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
0.31%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Federal Funds Purchased and Lines of Credit [Member]      
Debt Instrument [Line Items]      
Beginning Balance 7,435us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
8,974us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
2,683us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
Average balance outstanding for the period 5,189us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
8,971us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
5,804us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
Maximum balance outstanding at any month end during period $ 7,435us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
$ 8,974us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
$ 8,976us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
Weighted average interest rate for the period 0.25%smmf_WeightedAverageInterestRateForPeriod
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
0.25%smmf_WeightedAverageInterestRateForPeriod
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
0.25%smmf_WeightedAverageInterestRateForPeriod
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
Weighted average interest rate for balances outstanding 0.25%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
0.25%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
0.25%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= smmf_FederalFundsPurchasedAndLinesOfCreditMember
[1] December 31, 2014 financial information has been extracted from audited consolidated financial statements