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LOANS, Loans Modified as Troubled Debt Restructurings (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Loan
Mar. 31, 2014
Loan
Dec. 31, 2014
Loan
Troubled debt restructuring at end of period [Abstract]      
Number of Loans 71subk_FinancingReceivableModificationsNumberOfContracts3   70subk_FinancingReceivableModificationsNumberOfContracts3
Outstanding Recorded Balance $ 18,741us-gaap_FinancingReceivableModificationsRecordedInvestment   $ 19,673us-gaap_FinancingReceivableModificationsRecordedInvestment
Troubled debt restructured during year [Abstract]      
Number of Loans 3us-gaap_FinancingReceivableModificationsNumberOfContracts2 3us-gaap_FinancingReceivableModificationsNumberOfContracts2  
Pre-Modification, Outstanding Recorded Balance 206us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 377us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2  
Post-modification, Outstanding Recorded Balance 211us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 377us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2  
Defaulted Troubled Debt Restructurings [Member]      
Troubled debt restructured during year [Abstract]      
Number of Loans 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= subk_DefaultTroubledDebtRestructuredMember
2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= subk_DefaultTroubledDebtRestructuredMember
 
Pre-Modification, Outstanding Recorded Balance 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= subk_DefaultTroubledDebtRestructuredMember
1,596us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= subk_DefaultTroubledDebtRestructuredMember
 
Commercial and Industrial [Member]      
Troubled debt restructuring at end of period [Abstract]      
Number of Loans 30subk_FinancingReceivableModificationsNumberOfContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
  31subk_FinancingReceivableModificationsNumberOfContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Outstanding Recorded Balance 2,721us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
  3,683us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Troubled debt restructured during year [Abstract]      
Number of Loans 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
 
Pre-Modification, Outstanding Recorded Balance 12us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
377us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
 
Post-modification, Outstanding Recorded Balance 12us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
377us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
 
Commercial Real Estate [Member]      
Troubled debt restructuring at end of period [Abstract]      
Number of Loans 8subk_FinancingReceivableModificationsNumberOfContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
  8subk_FinancingReceivableModificationsNumberOfContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Outstanding Recorded Balance 10,057us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
  10,179us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate [Member] | Defaulted Troubled Debt Restructurings [Member]      
Troubled debt restructured during year [Abstract]      
Number of Loans 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= subk_DefaultTroubledDebtRestructuredMember
2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= subk_DefaultTroubledDebtRestructuredMember
 
Pre-Modification, Outstanding Recorded Balance 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= subk_DefaultTroubledDebtRestructuredMember
1,596us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= subk_DefaultTroubledDebtRestructuredMember
 
Residential Mortgages [Member]      
Troubled debt restructuring at end of period [Abstract]      
Number of Loans 21subk_FinancingReceivableModificationsNumberOfContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
  19subk_FinancingReceivableModificationsNumberOfContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Outstanding Recorded Balance 4,478us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
  4,314us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Troubled debt restructured during year [Abstract]      
Number of Loans 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Pre-Modification, Outstanding Recorded Balance 194us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Post-modification, Outstanding Recorded Balance 199us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Home Equity [Member]      
Troubled debt restructuring at end of period [Abstract]      
Number of Loans 5subk_FinancingReceivableModificationsNumberOfContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
  5subk_FinancingReceivableModificationsNumberOfContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Outstanding Recorded Balance 1,208us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
  1,216us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Consumer [Member]      
Troubled debt restructuring at end of period [Abstract]      
Number of Loans 7subk_FinancingReceivableModificationsNumberOfContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
  7subk_FinancingReceivableModificationsNumberOfContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Outstanding Recorded Balance $ 277us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
  $ 281us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember