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FAIR VALUE, Reconciliations for Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Level 3 [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Total $ 16,559us-gaap_FinancialInstrumentsOwnedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
[1] $ 16,942us-gaap_FinancialInstrumentsOwnedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
[1]  
Third Party Appraisal and or Internal Evaluation [Member] | Level 3 [Member] | Commercial and Industrial [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Total 3,049us-gaap_FinancialInstrumentsOwnedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= subk_CommercialFinancialAndAgriculturalMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalAndOrInternalEvaluationMember
[1] 3,384us-gaap_FinancialInstrumentsOwnedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= subk_CommercialFinancialAndAgriculturalMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalAndOrInternalEvaluationMember
[1]  
Third Party Appraisal and or Internal Evaluation [Member] | Level 3 [Member] | Commercial and Industrial [Member] | Minimum [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Discounts to appraisals for market conditions and selling costs (in hundredths) 5.60%subk_DiscountsToAppraisalsForMarketConditionsAndSellingCosts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= subk_CommercialFinancialAndAgriculturalMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalAndOrInternalEvaluationMember
   
Third Party Appraisal and or Internal Evaluation [Member] | Level 3 [Member] | Commercial and Industrial [Member] | Maximum [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Discounts to appraisals for market conditions and selling costs (in hundredths) 50.00%subk_DiscountsToAppraisalsForMarketConditionsAndSellingCosts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= subk_CommercialFinancialAndAgriculturalMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalAndOrInternalEvaluationMember
   
Third Party Appraisal and or Internal Evaluation [Member] | Level 3 [Member] | Commercial Real Estate [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Total 6,521us-gaap_FinancialInstrumentsOwnedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalAndOrInternalEvaluationMember
[1] 7,426us-gaap_FinancialInstrumentsOwnedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalAndOrInternalEvaluationMember
[1]  
Third Party Appraisal and or Internal Evaluation [Member] | Level 3 [Member] | Commercial Real Estate [Member] | Minimum [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Discounts to appraisals for market conditions and selling costs (in hundredths) 5.60%subk_DiscountsToAppraisalsForMarketConditionsAndSellingCosts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalAndOrInternalEvaluationMember
   
Third Party Appraisal and or Internal Evaluation [Member] | Level 3 [Member] | Commercial Real Estate [Member] | Maximum [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Discounts to appraisals for market conditions and selling costs (in hundredths) 6.60%subk_DiscountsToAppraisalsForMarketConditionsAndSellingCosts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalAndOrInternalEvaluationMember
   
Third Party Appraisal [Member] | Level 3 [Member] | Residential Mortgages [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Total 5,422us-gaap_FinancialInstrumentsOwnedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalMember
[1] 5,050us-gaap_FinancialInstrumentsOwnedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalMember
[1]  
Discounts to appraisals for market conditions and selling costs (in hundredths) 25.00%subk_DiscountsToAppraisalsForMarketConditionsAndSellingCosts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalMember
   
Third Party Appraisal [Member] | Level 3 [Member] | Home Equity [Member]      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Total 1,567us-gaap_FinancialInstrumentsOwnedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= subk_HomeEquityPortfolioSegmentMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalMember
[1] 1,082us-gaap_FinancialInstrumentsOwnedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= subk_HomeEquityPortfolioSegmentMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalMember
[1]  
Discounts to appraisals for market conditions and selling costs (in hundredths) 25.00%subk_DiscountsToAppraisalsForMarketConditionsAndSellingCosts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= subk_HomeEquityPortfolioSegmentMember
/ us-gaap_ValuationTechniqueAxis
= subk_ThirdPartyAppraisalMember
   
Liabilities Derivatives [Member]      
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Rollforward]      
Beginning balance 932us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Sales     0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Net increases (decreases) (180)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
932us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Ending balance 752us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
932us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Assets Collateralized Mortgage Obligations [Member]      
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Rollforward]      
Beginning balance 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CollateralizedMortgageObligationsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CollateralizedMortgageObligationsMember
7,994us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CollateralizedMortgageObligationsMember
Sales     (7,994)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CollateralizedMortgageObligationsMember
Net increases (decreases) 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CollateralizedMortgageObligationsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CollateralizedMortgageObligationsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CollateralizedMortgageObligationsMember
Ending balance $ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CollateralizedMortgageObligationsMember
$ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CollateralizedMortgageObligationsMember
$ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CollateralizedMortgageObligationsMember
[1] Collateral dependent.