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Income Taxes - Reconciliation of Federal Statutory Income Tax (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Loss before income taxes $ (28,491)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ (9,646)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ (50,525)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Tax computed at statutory rate (9,972)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (3,377)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (17,683)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
(Decrease) increase in charge resulting from:      
State taxes, net of federal benefit (1,606)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (635)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (3,040)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Tax exempt interest (net) (469)us-gaap_IncomeTaxReconciliationTaxExemptIncome (530)us-gaap_IncomeTaxReconciliationTaxExemptIncome (638)us-gaap_IncomeTaxReconciliationTaxExemptIncome
BOLI (664)snbc_IncomeTaxReconciliationBankOwnedLifeInsurance (659)snbc_IncomeTaxReconciliationBankOwnedLifeInsurance (695)snbc_IncomeTaxReconciliationBankOwnedLifeInsurance
Valuation allowance 13,297us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 5,067us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 21,981us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other, net 731us-gaap_IncomeTaxReconciliationOtherAdjustments 431us-gaap_IncomeTaxReconciliationOtherAdjustments 41us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax provision (benefit) $ 1,317us-gaap_IncomeTaxExpenseBenefit $ 297us-gaap_IncomeTaxExpenseBenefit $ (34)us-gaap_IncomeTaxExpenseBenefit
Tax computed at statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit, rate 5.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 6.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 6.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Tax exempt interest (net), rate 1.70%us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome 5.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
BOLI, rate 2.30%snbc_EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsurance 6.80%snbc_EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsurance 1.40%snbc_EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsurance
Valuation allowance, rate (46.70%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (52.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (43.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other, net, rate (2.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (4.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total income tax expense (benefit), rate (4.60%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (3.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations