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INVESTMENT SECURITIES, Other Disclosures (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Investment securities other disclosures [Abstract]        
Sale of Visa Class B equity securities (in shares)       100,000subk_SaleOfSharesInvestmentInEquitySecurities
Proceeds from sale of Visa Shares       $ 7,800,000subk_ProceedsFromSaleOfVisaShares
Contingent liability from counterparty estimated future exposure from Visa litigation 752,000subk_ContingentLiabilityCounterpartyFutureExposure 752,000subk_ContingentLiabilityCounterpartyFutureExposure    
Payment to the purchaser of Visa Class B shares   180,000subk_PaymentToThePurchaserOfVisaClassBShares    
Carrying Costs For Visa Litigation Expensed In The Period 70,000subk_CarryingCostsForVisaLitigationExpensedInPeriod   59,000subk_CarryingCostsForVisaLitigationExpensedInPeriod  
US Government agency securities held as available-for-sale pledged as collateral $ 3,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral      
Shares of Visa Class B securities held (in shares) 38,638subk_SharesOfVisaClassBSecuritiesHeld