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INCOME TAXES (Details) (USD $)
 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
Current [Abstract]                      
Federal                 $ 5,208,000us-gaap_CurrentFederalTaxExpenseBenefit $ 135,000us-gaap_CurrentFederalTaxExpenseBenefit $ (4,126,000)us-gaap_CurrentFederalTaxExpenseBenefit
State                 223,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 510,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 280,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current tax                 5,431,000us-gaap_CurrentIncomeTaxExpenseBenefit 645,000us-gaap_CurrentIncomeTaxExpenseBenefit (3,846,000)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred [Abstract]                      
Federal                 (885,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 3,046,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 1,412,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State                 (747,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 31,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,162,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred tax                 (1,632,000)us-gaap_DeferredIncomeTaxExpenseBenefit 3,077,000us-gaap_DeferredIncomeTaxExpenseBenefit 2,574,000us-gaap_DeferredIncomeTaxExpenseBenefit
Valuation allowance                 (79,000)us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability 0us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability 558,000us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
Total 687,000us-gaap_IncomeTaxExpenseBenefit 875,000us-gaap_IncomeTaxExpenseBenefit 1,047,000us-gaap_IncomeTaxExpenseBenefit 1,111,000us-gaap_IncomeTaxExpenseBenefit 866,000us-gaap_IncomeTaxExpenseBenefit 1,557,000us-gaap_IncomeTaxExpenseBenefit 816,000us-gaap_IncomeTaxExpenseBenefit 483,000us-gaap_IncomeTaxExpenseBenefit 3,720,000us-gaap_IncomeTaxExpenseBenefit 3,722,000us-gaap_IncomeTaxExpenseBenefit (714,000)us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate reconciliation [Abstract]                      
Federal income tax expense (benefit) at statutory rates (in hundredths)                 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Surtax exemption (in hundredths)                 (1.00%)subk_EffectiveIncomeTaxRateReconciliationSurtaxExemptionPercent 0.00%subk_EffectiveIncomeTaxRateReconciliationSurtaxExemptionPercent 0.00%subk_EffectiveIncomeTaxRateReconciliationSurtaxExemptionPercent
Tax-exempt income (in hundredths)                 (14.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (14.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (82.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
State income taxes, net of federal benefit (in hundredths)                 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 26.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Deferred tax asset adjustment (in hundredths)                 (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 62.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Other (in hundredths)                 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total (in hundredths)                 20.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 23.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations (29.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Deferred tax assets [Abstract]                      
Allowance for loan losses 7,576,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses       6,269,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses       7,576,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses 6,269,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses 6,458,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Post-retirement benefits 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits       0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits       0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 571,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Deferred compensation 1,652,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation       1,588,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation       1,652,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 1,588,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 1,642,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Stock-based compensation 459,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost       668,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost       459,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 668,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 458,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Unrealized losses on securities available for sale 0us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross       2,336,000us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross       0us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross 2,336,000us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross 0us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Realized losses on securities reclassed from available for sale to held to maturity 1,180,000subk_DeferredTaxAssetsRealizedLossesReclassedFromAvailableForSaleToHeldToMatutity       0subk_DeferredTaxAssetsRealizedLossesReclassedFromAvailableForSaleToHeldToMatutity       1,180,000subk_DeferredTaxAssetsRealizedLossesReclassedFromAvailableForSaleToHeldToMatutity 0subk_DeferredTaxAssetsRealizedLossesReclassedFromAvailableForSaleToHeldToMatutity 0subk_DeferredTaxAssetsRealizedLossesReclassedFromAvailableForSaleToHeldToMatutity
Unfunded pension obligation 2,496,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions       94,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions       2,496,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 94,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 2,826,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Alternative Minimum Tax credit 3,925,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax       668,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax       3,925,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 668,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 537,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Net operating loss carryforward 1,169,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards       2,864,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards       1,169,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 2,864,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 5,277,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other 992,000us-gaap_DeferredTaxAssetsOther       961,000us-gaap_DeferredTaxAssetsOther       992,000us-gaap_DeferredTaxAssetsOther 961,000us-gaap_DeferredTaxAssetsOther 1,300,000us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 19,449,000us-gaap_DeferredTaxAssetsNet       15,448,000us-gaap_DeferredTaxAssetsNet       19,449,000us-gaap_DeferredTaxAssetsNet 15,448,000us-gaap_DeferredTaxAssetsNet 19,069,000us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities [Abstract]                      
Unrealized gains on securities available for sale (1,724,000)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities       0us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities       (1,724,000)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities 0us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities (6,019,000)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities
Other (842,000)us-gaap_DeferredTaxLiabilitiesOther       (961,000)us-gaap_DeferredTaxLiabilitiesOther       (842,000)us-gaap_DeferredTaxLiabilitiesOther (961,000)us-gaap_DeferredTaxLiabilitiesOther (1,107,000)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (2,566,000)us-gaap_DeferredIncomeTaxLiabilities       (961,000)us-gaap_DeferredIncomeTaxLiabilities       (2,566,000)us-gaap_DeferredIncomeTaxLiabilities (961,000)us-gaap_DeferredIncomeTaxLiabilities (7,126,000)us-gaap_DeferredIncomeTaxLiabilities
Valuation allowance (1,169,000)us-gaap_DeferredTaxAssetsValuationAllowance       (534,000)us-gaap_DeferredTaxAssetsValuationAllowance       (1,169,000)us-gaap_DeferredTaxAssetsValuationAllowance (534,000)us-gaap_DeferredTaxAssetsValuationAllowance (558,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset 15,714,000us-gaap_DeferredTaxAssetsLiabilitiesNet       13,953,000us-gaap_DeferredTaxAssetsLiabilitiesNet       15,714,000us-gaap_DeferredTaxAssetsLiabilitiesNet 13,953,000us-gaap_DeferredTaxAssetsLiabilitiesNet 11,385,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Income Tax Contingency [Line Items]                      
Net operating loss carryforwards 0us-gaap_OperatingLossCarryforwards               0us-gaap_OperatingLossCarryforwards    
Valuation allowance 1,169,000us-gaap_DeferredTaxAssetsValuationAllowance       534,000us-gaap_DeferredTaxAssetsValuationAllowance       1,169,000us-gaap_DeferredTaxAssetsValuationAllowance 534,000us-gaap_DeferredTaxAssetsValuationAllowance 558,000us-gaap_DeferredTaxAssetsValuationAllowance
Income tax reconciliation, change in enacted tax rate                 818,000us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate    
Federal income tax statutory rates (in hundredths)                 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increase in income tax due to change in effective tax rates                 172,000us-gaap_IncreaseDecreaseInIncomeTaxes    
Income tax reconciliation, nondeductible expense, share-based compensation cost                 454,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost    
Cumulative net tax benefit                 536,000subk_CumulativeTaxBenefitNet    
Estimated effective tax rate (in hundredths)                 22.40%subk_EffectiveIncomeTaxRate 22.60%subk_EffectiveIncomeTaxRate  
Unrecognized tax benefits including interest 34,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued       34,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued       34,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 34,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 34,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Changes in unrecognized tax benefits [Roll Forward]                      
Balance January 1       34,000us-gaap_UnrecognizedTaxBenefits       34,000us-gaap_UnrecognizedTaxBenefits 34,000us-gaap_UnrecognizedTaxBenefits 34,000us-gaap_UnrecognizedTaxBenefits 38,000us-gaap_UnrecognizedTaxBenefits
Additions from current year tax positions                 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 1,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Reductions for prior year tax positions                 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (5,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Balance December 31 34,000us-gaap_UnrecognizedTaxBenefits       34,000us-gaap_UnrecognizedTaxBenefits       34,000us-gaap_UnrecognizedTaxBenefits 34,000us-gaap_UnrecognizedTaxBenefits 34,000us-gaap_UnrecognizedTaxBenefits
Minimum [Member]                      
Income Tax Contingency [Line Items]                      
Taxable income                 10,000,000subk_FederalStatutoryTaxableIncome
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum [Member]                      
Income Tax Contingency [Line Items]                      
Taxable income                 15,000,000subk_FederalStatutoryTaxableIncome
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Taxable Income Slab Amount Up to 10 Million [Member]                      
Effective income tax rate reconciliation [Abstract]                      
Federal income tax expense (benefit) at statutory rates (in hundredths)                 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_TaxPeriodAxis
= subk_TaxableIncomeSlabAmountUpToTenMillionMember		    
Income Tax Contingency [Line Items]                      
Federal income tax statutory rates (in hundredths)                 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_TaxPeriodAxis
= subk_TaxableIncomeSlabAmountUpToTenMillionMember		    
Taxable Income Slab Amount From 10 Million to 15 Million [Member]                      
Effective income tax rate reconciliation [Abstract]                      
Federal income tax expense (benefit) at statutory rates (in hundredths)                 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_TaxPeriodAxis
= subk_TaxableIncomeSlabAmountFromTenMillionToFifteenMillionMember		    
Income Tax Contingency [Line Items]                      
Federal income tax statutory rates (in hundredths)                 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_TaxPeriodAxis
= subk_TaxableIncomeSlabAmountFromTenMillionToFifteenMillionMember		    
New York State [Member]                      
Deferred tax liabilities [Abstract]                      
Valuation allowance (1,200,000)us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		               (1,200,000)us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Income Tax Contingency [Line Items]                      
Net operating loss carryforwards 26,200,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		               26,200,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Valuation allowance 1,200,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		               1,200,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Operating loss carryforwards, expiration dates                 Dec. 31, 2032    
Corporate tax rate, effective (in hundredths) 7.10%subk_EffectiveStateIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		               7.10%subk_EffectiveStateIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Corporate tax rate, future - 2016 (in hundredths) 6.50%subk_FutureApprovedEffectiveIncomeTaxRateReconciliationAtStateStatutoryIncomeTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		               6.50%subk_FutureApprovedEffectiveIncomeTaxRateReconciliationAtStateStatutoryIncomeTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Asset qualifying threshold for tax modification 8,000,000,000subk_IncomeTaxModificationMaximumCorporateAssets
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		               8,000,000,000subk_IncomeTaxModificationMaximumCorporateAssets
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Maximum mortgage threshold for loans $ 5,000,000subk_IncomeTaxModificationLoanMaximumThreshold
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		               $ 5,000,000subk_IncomeTaxModificationLoanMaximumThreshold
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember