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Real Estate Owned - Schedule of Real Estate Owned (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Real Estate Properties [Line Items]    
Real estate owned $ 522us-gaap_RealEstateAcquiredThroughForeclosure $ 2,503us-gaap_RealEstateAcquiredThroughForeclosure
Commercial Properties [Member]    
Real Estate Properties [Line Items]    
Real estate owned 90us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_CommercialRealEstateMember		 1,227us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_CommercialRealEstateMember
Residential Properties [Member]    
Real Estate Properties [Line Items]    
Real estate owned 54us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ResidentialRealEstateMember		 1,276us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ResidentialRealEstateMember
Bank Properties [Member]    
Real Estate Properties [Line Items]    
Real estate owned $ 378us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= snbc_BankPropertiesMember