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LOANS, Textual (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
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 745subk_AllocationOfSpecificReserveRegardingTroubledDebtRestructuring 790subk_AllocationOfSpecificReserveRegardingTroubledDebtRestructuring
Troubled debt restructuring funds committed $ 45subk_TroubledDebtRestructuringFundsCommitted $ 100subk_TroubledDebtRestructuringFundsCommitted
Minimum repayment period 2 years