XML 32 R109.htm IDEA: XBRL DOCUMENT v2.4.1.9
Regulatory Matters (Narrative) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Required reserve balance $ 594,000smmf_RequiredReserveBalanceWithFederalReserveBank  
Scenario, Forecast [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Amount Available for Dividend Distribution without Affecting Capital Adequacy Requirements   $ 15,500,000us-gaap_AmountAvailableForDividendDistributionWithoutAffectingCapitalAdequacyRequirements
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember