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LOANS, Textual (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Allowance for Loan Losses (Additional Textual) [Abstract]    
Number of consecutive years 5 years  
Threshold loan amount for annual rating review $ 500subk_ThresholdLoanAmountForAnnualRatingReview  
Allocation of specific reserve regarding troubled debt restructuring 790subk_AllocationOfSpecificReserveRegardingTroubledDebtRestructuring 586subk_AllocationOfSpecificReserveRegardingTroubledDebtRestructuring
Troubled debt restructuring funds committed $ 100subk_TroubledDebtRestructuringFundsCommitted $ 250subk_TroubledDebtRestructuringFundsCommitted
Minimum repayment period 2 years