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STOCKHOLDERS' EQUITY, Stock Option Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Contractual weighted-average lives of outstanding options at various prices [Abstract]        
Weighted-Average Remaining Contractual Life 7 years 2 months 12 days      
Weighted-Average Remaining Contractual Life 6 years 4 months 24 days      
Total outstanding, Options (in shares) 251,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 291,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 211,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 111,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Total exercisable, Options (in shares) 125,440us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber      
Total outstanding, Weighted-average price (in dollars per share) $ 16.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 16.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 15.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 22.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Total exercisable, Weighted-average price (in dollars per share) $ 17.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice      
10.00 - $14.00 [Member]        
Contractual weighted-average lives of outstanding options at various prices [Abstract]        
From (in dollars per share) $ 10.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOneMember		      
To (in dollars per share) $ 14.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOneMember		      
Outstanding shares (in shares) 120,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOneMember		      
Weighted-Average Remaining Contractual Life 7 years 1 month 6 days      
Weighted-average exercise price (in dollars per share) $ 11.97us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOneMember		      
Exercisable shares (in shares) 63,336us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOneMember		      
Weighted-Average Remaining Contractual Life 7 years 2 months 12 days      
Weighted-average exercise price (in dollars per share) $ 12.28us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOneMember		      
14.01 - $20.00 [Member]        
Contractual weighted-average lives of outstanding options at various prices [Abstract]        
From (in dollars per share) $ 14.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeTwoMember		      
To (in dollars per share) $ 20.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeTwoMember		      
Outstanding shares (in shares) 104,100us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeTwoMember		      
Weighted-Average Remaining Contractual Life 8 years 6 months      
Weighted-average exercise price (in dollars per share) $ 17.33us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeTwoMember		      
Exercisable shares (in shares) 35,104us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeTwoMember		      
Weighted-Average Remaining Contractual Life 8 years 6 months      
Weighted-average exercise price (in dollars per share) $ 17.35us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeTwoMember		      
20.01 - $30.00 [Member]        
Contractual weighted-average lives of outstanding options at various prices [Abstract]        
From (in dollars per share) $ 20.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeThreeMember		      
To (in dollars per share) $ 30.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeThreeMember		      
Outstanding shares (in shares) 5,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeThreeMember		      
Weighted-Average Remaining Contractual Life 4 years 1 month 6 days      
Weighted-average exercise price (in dollars per share) $ 28.30us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeThreeMember		      
Exercisable shares (in shares) 5,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeThreeMember		      
Weighted-Average Remaining Contractual Life 4 years 1 month 6 days      
Weighted-average exercise price (in dollars per share) $ 28.30us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeThreeMember		      
30.01 - $40.00 [Member]        
Contractual weighted-average lives of outstanding options at various prices [Abstract]        
From (in dollars per share) $ 30.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeFourMember		      
To (in dollars per share) $ 40.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeFourMember		      
Outstanding shares (in shares) 22,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeFourMember		      
Weighted-Average Remaining Contractual Life 1 year 7 months 6 days      
Weighted-average exercise price (in dollars per share) $ 32.69us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeFourMember		      
Exercisable shares (in shares) 22,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeFourMember		      
Weighted-Average Remaining Contractual Life 1 year 7 months 6 days      
Weighted-average exercise price (in dollars per share) $ 32.69us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= subk_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeFourMember