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CONCENTRATIONS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Concentration Risk [Line Items]    
Total loans $ 1,355,427us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 1,068,848us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Investment Securities [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember		  
Total investment securities 360,940us-gaap_MarketableSecurities
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember		  
Investment Securities [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Loans [Member]    
Concentration Risk [Line Items]    
Total loans 1,355,427us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Concentration risk, percentage (in hundredths) 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Loans [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 71.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Commercial and Industrial [Member] | Loans [Member]    
Concentration Risk [Line Items]    
Total loans 177,813us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_CommercialFinancialAndAgriculturalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Concentration risk, percentage (in hundredths) 13.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_CommercialFinancialAndAgriculturalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Commercial and Industrial [Member] | Loans [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 9.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_CommercialFinancialAndAgriculturalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Commercial Real Estate [Member] | Loans [Member]    
Concentration Risk [Line Items]    
Total loans 560,524us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Concentration risk, percentage (in hundredths) 41.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Commercial Real Estate [Member] | Loans [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 29.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Multifamily [Member] | Loans [Member]    
Concentration Risk [Line Items]    
Total loans 309,666us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_MultifamilyMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Concentration risk, percentage (in hundredths) 22.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_MultifamilyMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Multifamily [Member] | Loans [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 16.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_MultifamilyMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Mixed Use Commercial [Member] | Loans [Member]    
Concentration Risk [Line Items]    
Total loans 34,806us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_MixedUseCommercialMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Concentration risk, percentage (in hundredths) 2.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_MixedUseCommercialMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Mixed Use Commercial [Member] | Loans [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 1.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_MixedUseCommercialMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Real Estate Construction [Member] | Loans [Member]    
Concentration Risk [Line Items]    
Total loans 26,206us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_RealEstateConstructionPortfolioSegmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Concentration risk, percentage (in hundredths) 1.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_RealEstateConstructionPortfolioSegmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Real Estate Construction [Member] | Loans [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 1.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_RealEstateConstructionPortfolioSegmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Residential Mortgages [Member] | Loans [Member]    
Concentration Risk [Line Items]    
Total loans 187,828us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Concentration risk, percentage (in hundredths) 13.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Residential Mortgages [Member] | Loans [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 9.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Home Equity [Member] | Loans [Member]    
Concentration Risk [Line Items]    
Total loans 50,982us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_HomeEquityPortfolioSegmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Concentration risk, percentage (in hundredths) 3.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_HomeEquityPortfolioSegmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Home Equity [Member] | Loans [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 2.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= subk_HomeEquityPortfolioSegmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Consumer [Member] | Loans [Member]    
Concentration Risk [Line Items]    
Total loans 7,602us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Concentration risk, percentage (in hundredths) 0.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember		  
Consumer [Member] | Loans [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 0.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
US Government Agency Securities [Member] | Investment Securities [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 24.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember		  
Total investment securities 89,942us-gaap_MarketableSecurities
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember		  
US Government Agency Securities [Member] | Investment Securities [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 4.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Corporate Bonds [Member] | Investment Securities [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 1.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember		  
Total investment securities 6,408us-gaap_MarketableSecurities
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember		  
Corporate Bonds [Member] | Investment Securities [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 0.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Collateralized Mortgage Obligations [Member] | Investment Securities [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 6.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CollateralizedMortgageObligationsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember		  
Total investment securities 21,997us-gaap_MarketableSecurities
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CollateralizedMortgageObligationsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember		  
Collateralized Mortgage Obligations [Member] | Investment Securities [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 1.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CollateralizedMortgageObligationsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Mortgage-backed Securities [Member] | Investment Securities [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 25.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_MortgageBackedSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember		  
Total investment securities 90,919us-gaap_MarketableSecurities
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_MortgageBackedSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember		  
Mortgage-backed Securities [Member] | Investment Securities [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 4.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_MortgageBackedSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember		  
Obligations of States and Political Subdivisions [Member] | Investment Securities [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 42.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember		  
Total investment securities $ 151,674us-gaap_MarketableSecurities
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember		  
Obligations of States and Political Subdivisions [Member] | Investment Securities [Member] | Assets [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage (in hundredths) 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= subk_InvestmentSecuritiesMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetsTotalMember