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FINANCIAL STATEMENT PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Corporation
Mar. 31, 2014
Summary of Significant Accounting Policies [Abstract]    
Ownership percentage (in hundredths) 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage  
Number of corporation used to acquire foreclosed real estate 2subk_NumberOfCorporationUsedToAcquireForeclosedRealEstate  
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]    
Weighted average common shares outstanding (in shares) 11,602,924us-gaap_WeightedAverageNumberOfSharesIssuedBasic 11,573,014us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Weighted average unvested restricted shares (in shares) 91,503us-gaap_WeightedAverageNumberOfSharesRestrictedStock 0us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Weighted average shares for basic earnings per share 11,694,427us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 11,573,014us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Additional diluted shares:    
Stock options (in shares) 68,672us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares 58,448us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Weighted average shares for diluted earnings per share (in shares) 11,763,099us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,631,462us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Loans and Loan Interest Income Recognition [Abstract]    
Maximum period for accrued interest for all class of loans 90 days  
Allowance for Loan Losses [Abstract]    
Threshold for non-accrual loans to be evaluated individually for impairment $ 250subk_MinimumLoanEvaluatedIndividuallyForImpairment