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Stock-Based Incentive Plans - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued 218,824us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod 87,534us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod 117,627us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod  
Stock-based incentive plans, options expiry term 10 years      
Number of Options, Granted 144,296us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 19,222us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 46,529us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Stock options outstanding 318,901us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 299,107us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 350,642us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 565,615us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options forfeited 24,324us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod 30,758us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod 19,423us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod  
Weighted average fair value of options, granted $ 8.70snbc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueAssumptions $ 9.25snbc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueAssumptions $ 7.61snbc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueAssumptions  
Aggregate intrinsic value for options outstanding $ 188,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue $ 70,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue $ 132,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue  
Options exercised 802us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 559us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Proceeds from shares exercised 16,000us-gaap_ProceedsFromStockOptionsExercised 8,000us-gaap_ProceedsFromStockOptionsExercised    
Aggregate intrinsic value of options exercisable 46,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue 19,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue  
Total unrecognized compensation cost related to options 837,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions      
Cost of the options recognized over a weighted average period 2 years 1 month 6 days      
Granted value 3,100,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 1,600,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 1,800,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation  
Total unrecognized compensation cost related to nonvested stock awards 3,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions      
Cost of stock awards recognized over a weighted average period 3 years 3 months 18 days      
Stock-Based Incentive Plan 2010 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized 980,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndTenMember
     
Stock-based incentive plans, options expiry term 10 years      
Number of Options, Granted 255,220us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndTenMember
     
Number of stock awards allowed 529,480us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndTenMember
     
Stock options outstanding 170,416us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndTenMember
     
2014 Performance Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= snbc_TwoThousandFourteenPerformancePlanMember
     
Number of shares issued 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= snbc_TwoThousandFourteenPerformancePlanMember
     
2014 Performance Plan [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price of shares 100.00%snbc_ShareBasedPaymentExercisePricePercentOfSharePrice
/ us-gaap_PlanNameAxis
= snbc_TwoThousandFourteenPerformancePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Stock-Based Incentive Plan 2004 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized 500,085us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndFourMember
     
Number of shares issued 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndFourMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndFourMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndFourMember
 
Stock options outstanding 148,485us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndFourMember
     
Stock plan expiration year 2014      
Shares of common stock available for future grants after amendment 0snbc_NumberOfSharesAvailableForFutureGrantsAfterAmendment
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndFourMember
     
Stock-based incentive plans, options expiry term 10 years      
2010 Performance Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized 540,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= snbc_TwoThousandTenPerformancePlanMember
     
Exercise price of shares 110.00%snbc_ShareBasedPaymentExercisePricePercentOfSharePrice
/ us-gaap_PlanNameAxis
= snbc_TwoThousandTenPerformancePlanMember
     
Performance plan termination period 2014-05      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock awards granted 218,824us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
87,534us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
117,627us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Stock Awards forfeited 34,606us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
108,995us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
3,815us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Stock Awards outstanding 248,654us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
86,366us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
127,807us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
35,197us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Total compensation expense recognized on stock awards $ 359,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 263,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 469,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Restricted Stock [Member] | Stock-Based Incentive Plan 2010 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock awards granted 423,992us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndTenMember
     
Options forfeited 83,444us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndTenMember
     
Stock Awards forfeited 145,248us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndTenMember
     
Stock Awards outstanding 248,654us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndTenMember
     
Restricted Stock [Member] | Stock-Based Incentive Plan 2010 [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock awards allowed 280,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndTenMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Restricted Stock [Member] | Stock-Based Incentive Plan 2004 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Awards outstanding 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndFourMember
     
Stock Awards [Member] | Stock-Based Incentive Plan 2010 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock awards allowed 1,256us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= snbc_StockAwardsMember
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndTenMember
     
Options [Member] | Stock-Based Incentive Plan 2004 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndFourMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndFourMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= snbc_StockBasedIncentivePlanTwoThousandAndFourMember