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Earnings Per Share (Computations Of Basic And Diluted Earnings Per Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Line Items]                      
Net income $ 3,199us-gaap_ProfitLoss $ 3,336us-gaap_ProfitLoss $ 2,432us-gaap_ProfitLoss $ 2,389us-gaap_ProfitLoss $ 2,788us-gaap_ProfitLoss $ 2,272us-gaap_ProfitLoss $ 1,216us-gaap_ProfitLoss $ 1,792us-gaap_ProfitLoss $ 11,356us-gaap_ProfitLoss $ 8,068us-gaap_ProfitLoss $ 5,713us-gaap_ProfitLoss
Less preferred stock dividends                 (771)us-gaap_PreferredStockDividendsIncomeStatementImpact (775)us-gaap_PreferredStockDividendsIncomeStatementImpact (777)us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income (loss) applicable to common shares 3,008us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 3,143us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 2,239us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 2,195us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 2,594us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 2,078us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 1,023us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 1,598us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 10,585us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 7,293us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 4,936us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic EPS, Common Shares (Denominator) (in shares)                 7,539,444us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,442,689us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,425,472us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic EPS (in dollars per share) $ 0.39us-gaap_EarningsPerShareBasic $ 0.42us-gaap_EarningsPerShareBasic $ 0.30us-gaap_EarningsPerShareBasic $ 0.29us-gaap_EarningsPerShareBasic $ 0.35us-gaap_EarningsPerShareBasic $ 0.28us-gaap_EarningsPerShareBasic $ 0.14us-gaap_EarningsPerShareBasic $ 0.22us-gaap_EarningsPerShareBasic $ 1.40us-gaap_EarningsPerShareBasic $ 0.98us-gaap_EarningsPerShareBasic $ 0.66us-gaap_EarningsPerShareBasic
Diluted EPS, Stock options, Common Shares (Denominator) (in shares)                 9,381us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 7,532us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,152us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted EPS, Income (Numerator)                 11,356us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 8,068us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 5,713us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Diluted EPS, Common Shares (Denominator) (in shares)                 9,711,561us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,621,504us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,601,169us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted EPS (in dollars per share) $ 0.32us-gaap_EarningsPerShareDiluted $ 0.35us-gaap_EarningsPerShareDiluted $ 0.25us-gaap_EarningsPerShareDiluted $ 0.25us-gaap_EarningsPerShareDiluted $ 0.29us-gaap_EarningsPerShareDiluted $ 0.24us-gaap_EarningsPerShareDiluted $ 0.13us-gaap_EarningsPerShareDiluted $ 0.19us-gaap_EarningsPerShareDiluted $ 1.17us-gaap_EarningsPerShareDiluted $ 0.84us-gaap_EarningsPerShareDiluted $ 0.60us-gaap_EarningsPerShareDiluted
Series 2011 Preferred Stock [Member]                      
Earnings Per Share [Line Items]                      
Diluted EPS, convertible preferred stock dividend, Income (Numerator)                 476smmf_ConvertiblePreferredDividends
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
478smmf_ConvertiblePreferredDividends
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
480smmf_ConvertiblePreferredDividends
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Diluted EPS, convertible preferred stock, Common Shares (Denominator) (in shares)                 1,489,735us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
1,496,738us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
1,500,000us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Series 2009 Preferred Stock [Member]                      
Earnings Per Share [Line Items]                      
Diluted EPS, convertible preferred stock dividend, Income (Numerator)                 $ 295smmf_ConvertiblePreferredDividends
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 297smmf_ConvertiblePreferredDividends
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 297smmf_ConvertiblePreferredDividends
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Diluted EPS, convertible preferred stock, Common Shares (Denominator) (in shares)                 673,001us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
674,545us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
674,545us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember