2.4.1.9 Html 569 761 1 true 154 0 false 21 false false R1.htm 1001 - Document - Document and Entity Information Sheet http://www.sunnationalbank.com/taxonomy/role/DocumentandEntityInformation Document and Entity Information false false R2.htm 1003 - Statement - Consolidated Statements of Financial Condition Sheet http://www.sunnationalbank.com/taxonomy/role/StatementOfFinancialPositionClassified Consolidated Statements of Financial Condition false false R3.htm 1004 - Statement - Consolidated Statements of Financial Condition (Parenthetical) Sheet http://www.sunnationalbank.com/taxonomy/role/StatementOfFinancialPositionClassifiedParenthetical Consolidated Statements of Financial Condition (Parenthetical) false false R4.htm 1005 - Statement - Consolidated Statements of Operations Sheet http://www.sunnationalbank.com/taxonomy/role/StatementOfIncome Consolidated Statements of Operations false false R5.htm 1006 - Statement - Consolidated Statements of Operations (Parenthetical) Sheet http://www.sunnationalbank.com/taxonomy/role/StatementOfIncomeParenthetical Consolidated Statements of Operations (Parenthetical) false false R6.htm 1007 - Statement - Consolidated Statements of Comprehensive Loss Sheet http://www.sunnationalbank.com/taxonomy/role/StatementOfOtherComprehensiveIncome Consolidated Statements of Comprehensive Loss false false R7.htm 1008 - Statement - Consolidated Statements of Shareholders' Equity Sheet http://www.sunnationalbank.com/taxonomy/role/StatementOfShareholdersEquityAndOtherComprehensiveIncome Consolidated Statements of Shareholders' Equity false false R8.htm 1009 - Statement - Consolidated Statements of Cash Flows Sheet http://www.sunnationalbank.com/taxonomy/role/StatementOfCashFlowsIndirect Consolidated Statements of Cash Flows false false R9.htm 1010 - Disclosure - Nature of Operations Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock Nature of Operations false false R10.htm 1011 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlock Summary of Significant Accounting Policies false false R11.htm 1012 - Disclosure - Branch Sales and Consolidations Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsBranchSalesAndConsolidationsTextBlock Branch Sales and Consolidations false false R12.htm 1013 - Disclosure - Investment Securities Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock Investment Securities false false R13.htm 1014 - Disclosure - Loans Receivable Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsFinancingReceivablesTextBlock Loans Receivable false false R14.htm 1015 - Disclosure - Allowance for Loan Losses Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsAllowanceForCreditLossesTextBlock Allowance for Loan Losses false false R15.htm 1016 - Disclosure - Restricted Equity Investments Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsRestrictedEquityInvestmentsTextBlock Restricted Equity Investments false false R16.htm 1017 - Disclosure - Bank Properties and Equipment Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlock Bank Properties and Equipment false false R17.htm 1018 - Disclosure - Real Estate Owned Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsRealEstateOwnedTextBlock Real Estate Owned false false R18.htm 1019 - Disclosure - Goodwill and Intangible Assets Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlock Goodwill and Intangible Assets false false R19.htm 1020 - Disclosure - Deposits Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsDepositLiabilitiesDisclosuresTextBlock Deposits false false R20.htm 1021 - Disclosure - Advances from the Federal Home Loan Bank of New York Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsFederalHomeLoanBankAdvancesDisclosureTextBlock Advances from the Federal Home Loan Bank of New York false false R21.htm 1022 - Disclosure - Junior Subordinated Debentures Held by Trusts that Issued Capital Debt Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsJuniorSubordinatedDebenturesHeldByTrustsThatIssuedCapitalDebtTextBlock Junior Subordinated Debentures Held by Trusts that Issued Capital Debt false false R22.htm 1023 - Disclosure - Stock-Based Incentive Plans Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock Stock-Based Incentive Plans false false R23.htm 1024 - Disclosure - Employee and Director Stock Purchase Plans Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsEmployeeAndDirectorStockPurchasePlansTextBlock Employee and Director Stock Purchase Plans false false R24.htm 1025 - Disclosure - Benefits Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsPensionAndOtherPostretirementBenefitsDisclosureTextBlock Benefits false false R25.htm 1026 - Disclosure - Commitments and Contingent Liabilities Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock Commitments and Contingent Liabilities false false R26.htm 1027 - Disclosure - Derivative Financial Instruments and Hedging Activities Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock Derivative Financial Instruments and Hedging Activities false false R27.htm 1028 - Disclosure - Income Taxes Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock Income Taxes false false R28.htm 1029 - Disclosure - Loss Per Common Share Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock Loss Per Common Share false false R29.htm 1030 - Disclosure - Regulatory Matters Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock Regulatory Matters false false R30.htm 1031 - Disclosure - Fair Value of Financial Instruments Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock Fair Value of Financial Instruments false false R31.htm 1032 - Disclosure - Related Party Transactions Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock Related Party Transactions false false R32.htm 1033 - Disclosure - Condensed Financial Information of Parent Company Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsCondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock Condensed Financial Information of Parent Company false false R33.htm 1034 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlockPolicies Summary of Significant Accounting Policies (Policies) false false R34.htm 1035 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlockTables Summary of Significant Accounting Policies (Tables) false false R35.htm 1036 - Disclosure - Branch Sales and Consolidations (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsBranchSalesAndConsolidationsTextBlockTables Branch Sales and Consolidations (Tables) false false R36.htm 1037 - Disclosure - Investment Securities (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlockTables Investment Securities (Tables) false false R37.htm 1038 - Disclosure - Loans Receivable (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsFinancingReceivablesTextBlockTables Loans Receivable (Tables) false false R38.htm 1039 - Disclosure - Allowance for Loan Losses (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsAllowanceForCreditLossesTextBlockTables Allowance for Loan Losses (Tables) false false R39.htm 1040 - Disclosure - Restricted Equity Investments (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsRestrictedEquityInvestmentsTextBlockTables Restricted Equity Investments (Tables) false false R40.htm 1041 - Disclosure - Bank Properties and Equipment (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlockTables Bank Properties and Equipment (Tables) false false R41.htm 1042 - Disclosure - Real Estate Owned (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsRealEstateOwnedTextBlockTables Real Estate Owned (Tables) false false R42.htm 1043 - Disclosure - Deposits (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsDepositLiabilitiesDisclosuresTextBlockTables Deposits (Tables) false false R43.htm 1044 - Disclosure - Advances from the Federal Home Loan Bank of New York (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsFederalHomeLoanBankAdvancesDisclosureTextBlockTables Advances from the Federal Home Loan Bank of New York (Tables) false false R44.htm 1045 - Disclosure - Junior Subordinated Debentures Held by Trusts that Issued Capital Debt (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsJuniorSubordinatedDebenturesHeldByTrustsThatIssuedCapitalDebtTextBlockTables Junior Subordinated Debentures Held by Trusts that Issued Capital Debt (Tables) false false R45.htm 1046 - Disclosure - Stock-Based Incentive Plans (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockTables Stock-Based Incentive Plans (Tables) false false R46.htm 1047 - Disclosure - Commitments and Contingent Liabilities (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlockTables Commitments and Contingent Liabilities (Tables) false false R47.htm 1048 - Disclosure - Derivative Financial Instruments and Hedging Activities (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlockTables Derivative Financial Instruments and Hedging Activities (Tables) false false R48.htm 1049 - Disclosure - Income Taxes (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlockTables Income Taxes (Tables) false false R49.htm 1050 - Disclosure - Loss Per Common Share (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlockTables Loss Per Common Share (Tables) false false R50.htm 1051 - Disclosure - Regulatory Matters (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlockTables Regulatory Matters (Tables) false false R51.htm 1052 - Disclosure - Fair Value of Financial Instruments (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlockTables Fair Value of Financial Instruments (Tables) false false R52.htm 1053 - Disclosure - Related Party Transactions (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlockTables Related Party Transactions (Tables) false false R53.htm 1054 - Disclosure - Condensed Financial Information of Parent Company (Tables) Sheet http://www.sunnationalbank.com/taxonomy/role/NotesToFinancialStatementsCondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlockTables Condensed Financial Information of Parent Company (Tables) false false R54.htm 1055 - Disclosure - Nature of Operations - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureNatureOfOperationsAdditionalInformation Nature of Operations - Additional Information (Detail) false false R55.htm 1056 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformation Summary of Significant Accounting Policies - Additional Information (Detail) false false R56.htm 1057 - Disclosure - Summary of Significant Accounting Policies - Summary of Estimated Useful Lives of Bank Properties and Equipment (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfEstimatedUsefulLivesOfBankPropertiesAndEquipment Summary of Significant Accounting Policies - Summary of Estimated Useful Lives of Bank Properties and Equipment (Detail) false false R57.htm 1058 - Disclosure - Summary of Significant Accounting Policies - Schedule of Components of Mortgage Banking Revenue (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfComponentsOfMortgageBankingRevenue Summary of Significant Accounting Policies - Schedule of Components of Mortgage Banking Revenue (Detail) false false R58.htm 1059 - Disclosure - Summary of Significant Accounting Policies - Reclassifications of Accumulated Other Comprehensive Loss Items (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesReclassificationsOfAccumulatedOtherComprehensiveLossItems Summary of Significant Accounting Policies - Reclassifications of Accumulated Other Comprehensive Loss Items (Detail) false false R59.htm 1060 - Disclosure - Summary of Significant Accounting Policies - Summary of Weighted Average Assumptions Used to Calculate Fair Value of Option Awards (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfWeightedAverageAssumptionsUsedToCalculateFairValueOfOptionAwards Summary of Significant Accounting Policies - Summary of Weighted Average Assumptions Used to Calculate Fair Value of Option Awards (Detail) false false R60.htm 1061 - Disclosure - Summary of Significant Accounting Policies - Summary of Weighted Average Assumptions Used to Calculate Fair Value of Option Awards (Parenthetical) (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfWeightedAverageAssumptionsUsedToCalculateFairValueOfOptionAwardsParenthetical Summary of Significant Accounting Policies - Summary of Weighted Average Assumptions Used to Calculate Fair Value of Option Awards (Parenthetical) (Detail) false false R61.htm 1062 - Disclosure - Branch Sales and Consolidations - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureBranchSalesAndConsolidationsAdditionalInformation Branch Sales and Consolidations - Additional Information (Detail) false false R62.htm 1063 - Disclosure - Branch Sale and Consolidations - Summary of Branch Assets and Liabilities Classified as Held-for-Sale (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureBranchSaleAndConsolidationsSummaryOfBranchAssetsAndLiabilitiesClassifiedAsHeldforSale Branch Sale and Consolidations - Summary of Branch Assets and Liabilities Classified as Held-for-Sale (Detail) false false R63.htm 1064 - Disclosure - Investment Securities - Available for Sale and Held to Maturity Investment (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureInvestmentSecuritiesAvailableForSaleAndHeldToMaturityInvestment Investment Securities - Available for Sale and Held to Maturity Investment (Detail) false false R64.htm 1065 - Disclosure - Investment Securities - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureInvestmentSecuritiesAdditionalInformation Investment Securities - Additional Information (Detail) false false R65.htm 1066 - Disclosure - Investment Securities - Gross Unrealized Losses by Investment Category (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureInvestmentSecuritiesGrossUnrealizedLossesByInvestmentCategory Investment Securities - Gross Unrealized Losses by Investment Category (Detail) false false R66.htm 1067 - Disclosure - Investment Securities - Contractual Maturities of Investment Securities (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureInvestmentSecuritiesContractualMaturitiesOfInvestmentSecurities Investment Securities - Contractual Maturities of Investment Securities (Detail) false false R67.htm 1068 - Disclosure - Loans Receivable - Loan Components (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureLoansReceivableLoanComponents Loans Receivable - Loan Components (Detail) false false R68.htm 1069 - Disclosure - Loans Receivable - Loans on Non-accrual Status (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureLoansReceivableLoansOnNonaccrualStatus Loans Receivable - Loans on Non-accrual Status (Detail) false false R69.htm 1070 - Disclosure - Loans Receivable - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureLoansReceivableAdditionalInformation Loans Receivable - Additional Information (Detail) false false R70.htm 1071 - Disclosure - Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Financing Receivables (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureAllowanceForLoanLossesAllowanceForLoanLossesAndRecordedInvestmentInFinancingReceivables Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Financing Receivables (Detail) false false R71.htm 1072 - Disclosure - Allowance for Loan Losses - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureAllowanceForLoanLossesAdditionalInformation Allowance for Loan Losses - Additional Information (Detail) false false R72.htm 1073 - Disclosure - Allowance for Loan Losses - Components of Impaired Loans Held-for-Investment (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureAllowanceForLoanLossesComponentsOfImpairedLoansHeldforInvestment Allowance for Loan Losses - Components of Impaired Loans Held-for-Investment (Detail) false false R73.htm 1074 - Disclosure - Allowance for Loan Losses - Analysis of Company's TDR Agreements (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureAllowanceForLoanLossesAnalysisOfCompanysTDRAgreements Allowance for Loan Losses - Analysis of Company's TDR Agreements (Detail) false false R74.htm 1075 - Disclosure - Allowance for Loan Losses - Information Regarding Types of Concessions Granted on Loans (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureAllowanceForLoanLossesInformationRegardingTypesOfConcessionsGrantedOnLoans Allowance for Loan Losses - Information Regarding Types of Concessions Granted on Loans (Detail) false false R75.htm 1076 - Disclosure - Allowance for Loan Losses - Company's Distribution of Risk Ratings within Held-for-Investment Loan Portfolio (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureAllowanceForLoanLossesCompanysDistributionOfRiskRatingsWithinHeldforInvestmentLoanPortfolio Allowance for Loan Losses - Company's Distribution of Risk Ratings within Held-for-Investment Loan Portfolio (Detail) false false R76.htm 1077 - Disclosure - Allowance for Loan Losses - Company's Analysis of Past Due Held-for-Investment Loans (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureAllowanceForLoanLossesCompanysAnalysisOfPastDueHeldforInvestmentLoans Allowance for Loan Losses - Company's Analysis of Past Due Held-for-Investment Loans (Detail) false false R77.htm 1078 - Disclosure - Restricted Equity Investments - Restricted Equity Investments (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureRestrictedEquityInvestmentsRestrictedEquityInvestments Restricted Equity Investments - Restricted Equity Investments (Detail) false false R78.htm 1079 - Disclosure - Bank Properties and Equipment - Summary of Bank Properties and Equipment (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureBankPropertiesAndEquipmentSummaryOfBankPropertiesAndEquipment Bank Properties and Equipment - Summary of Bank Properties and Equipment (Detail) false false R79.htm 1080 - Disclosure - Bank Properties and Equipment - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureBankPropertiesAndEquipmentAdditionalInformation Bank Properties and Equipment - Additional Information (Detail) false false R80.htm 1081 - Disclosure - Real Estate Owned - Schedule of Real Estate Owned (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureRealEstateOwnedScheduleOfRealEstateOwned Real Estate Owned - Schedule of Real Estate Owned (Detail) false false R81.htm 1082 - Disclosure - Real Estate Owned - Summary of Real Estate Owned Activity (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureRealEstateOwnedSummaryOfRealEstateOwnedActivity Real Estate Owned - Summary of Real Estate Owned Activity (Detail) false false R82.htm 1083 - Disclosure - Real Estate Owned - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureRealEstateOwnedAdditionalInformation Real Estate Owned - Additional Information (Detail) false false R83.htm 1084 - Disclosure - Real Estate Owned - Summary of Real Estate Owned Expenses, Net (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureRealEstateOwnedSummaryOfRealEstateOwnedExpensesNet Real Estate Owned - Summary of Real Estate Owned Expenses, Net (Detail) false false R84.htm 1085 - Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformation Goodwill and Intangible Assets - Additional Information (Detail) false false R85.htm 1086 - Disclosure - Deposits - Major Classifications of Deposits (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureDepositsMajorClassificationsOfDeposits Deposits - Major Classifications of Deposits (Detail) false false R86.htm 1087 - Disclosure - Deposits - Time Deposits by Year of Maturity (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureDepositsTimeDepositsByYearOfMaturity Deposits - Time Deposits by Year of Maturity (Detail) false false R87.htm 1088 - Disclosure - Deposits - Interest Expense on Deposits (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureDepositsInterestExpenseOnDeposits Deposits - Interest Expense on Deposits (Detail) false false R88.htm 1089 - Disclosure - Advances from the Federal Home Loan Bank of New York - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureAdvancesFromTheFederalHomeLoanBankOfNewYorkAdditionalInformation Advances from the Federal Home Loan Bank of New York - Additional Information (Detail) false false R89.htm 1090 - Disclosure - Advances from the Federal Home Loan Bank of New York - Contractual Maturities of Advances from the FHLB NY (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureAdvancesFromTheFederalHomeLoanBankOfNewYorkContractualMaturitiesOfAdvancesFromTheFHLBNY Advances from the Federal Home Loan Bank of New York - Contractual Maturities of Advances from the FHLB NY (Detail) false false R90.htm 1091 - Disclosure - Junior Subordinated Debentures Held by Trusts that Issued Capital Debt - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureJuniorSubordinatedDebenturesHeldByTrustsThatIssuedCapitalDebtAdditionalInformation Junior Subordinated Debentures Held by Trusts that Issued Capital Debt - Additional Information (Detail) false false R91.htm 1092 - Disclosure - Junior Subordinated Debentures Held by Trusts that Issued Capital Debt - Summary of Capital Securities and Junior Subordinated Debentures (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureJuniorSubordinatedDebenturesHeldByTrustsThatIssuedCapitalDebtSummaryOfCapitalSecuritiesAndJuniorSubordinatedDebentures Junior Subordinated Debentures Held by Trusts that Issued Capital Debt - Summary of Capital Securities and Junior Subordinated Debentures (Detail) false false R92.htm 1093 - Disclosure - Stock-Based Incentive Plans - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureStockBasedIncentivePlansAdditionalInformation Stock-Based Incentive Plans - Additional Information (Detail) false false R93.htm 1094 - Disclosure - Stock-Based Incentive Plans - Summary of Stock Options Granted and Outstanding (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureStockBasedIncentivePlansSummaryOfStockOptionsGrantedAndOutstanding Stock-Based Incentive Plans - Summary of Stock Options Granted and Outstanding (Detail) false false R94.htm 1095 - Disclosure - Stock-Based Incentive Plans - Summary of Stock Options Granted and Outstanding (Parenthetical) (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureStockBasedIncentivePlansSummaryOfStockOptionsGrantedAndOutstandingParenthetical Stock-Based Incentive Plans - Summary of Stock Options Granted and Outstanding (Parenthetical) (Detail) false false R95.htm 1096 - Disclosure - Stock-Based Incentive Plans - Summary of Stock Option Activity (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureStockBasedIncentivePlansSummaryOfStockOptionActivity Stock-Based Incentive Plans - Summary of Stock Option Activity (Detail) false false R96.htm 1097 - Disclosure - Stock-Based Incentive Plans - Summary of Stock Option Activity (Parenthetical) (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureStockBasedIncentivePlansSummaryOfStockOptionActivityParenthetical Stock-Based Incentive Plans - Summary of Stock Option Activity (Parenthetical) (Detail) false false R97.htm 1098 - Disclosure - Stock-Based Incentive Plans - Summary of Nonvested Option Activity (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureStockBasedIncentivePlansSummaryOfNonvestedOptionActivity Stock-Based Incentive Plans - Summary of Nonvested Option Activity (Detail) false false R98.htm 1099 - Disclosure - Stock-Based Incentive Plans - Summary of Nonvested Option Activity (Parenthetical) (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureStockBasedIncentivePlansSummaryOfNonvestedOptionActivityParenthetical Stock-Based Incentive Plans - Summary of Nonvested Option Activity (Parenthetical) (Detail) false false R99.htm 1100 - Disclosure - Stock-Based Incentive Plans - Summary of Nonvested Stock Award Activity (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureStockBasedIncentivePlansSummaryOfNonvestedStockAwardActivity Stock-Based Incentive Plans - Summary of Nonvested Stock Award Activity (Detail) false false R100.htm 1101 - Disclosure - Stock-Based Incentive Plans - Summary of Nonvested Stock Award Activity (Parenthetical) (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureStockBasedIncentivePlansSummaryOfNonvestedStockAwardActivityParenthetical Stock-Based Incentive Plans - Summary of Nonvested Stock Award Activity (Parenthetical) (Detail) false false R101.htm 1102 - Disclosure - Employee and Director Stock Purchase Plans - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureEmployeeAndDirectorStockPurchasePlansAdditionalInformation Employee and Director Stock Purchase Plans - Additional Information (Detail) false false R102.htm 1103 - Disclosure - Benefits - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureBenefitsAdditionalInformation Benefits - Additional Information (Detail) false false R103.htm 1104 - Disclosure - Commitments and Contingent Liabilities - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureCommitmentsAndContingentLiabilitiesAdditionalInformation Commitments and Contingent Liabilities - Additional Information (Detail) false false R104.htm 1105 - Disclosure - Commitments and Contingent Liabilities - Schedule of Future Minimum Lease Payments under Capital Leases (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureCommitmentsAndContingentLiabilitiesScheduleOfFutureMinimumLeasePaymentsUnderCapitalLeases Commitments and Contingent Liabilities - Schedule of Future Minimum Lease Payments under Capital Leases (Detail) false false R105.htm 1106 - Disclosure - Commitments and Contingent Liabilities - Future Minimum Payments under Noncancelable Operating Leases (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureCommitmentsAndContingentLiabilitiesFutureMinimumPaymentsUnderNoncancelableOperatingLeases Commitments and Contingent Liabilities - Future Minimum Payments under Noncancelable Operating Leases (Detail) false false R106.htm 1107 - Disclosure - Derivative Financial Instruments and Hedging Activities - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesAdditionalInformation Derivative Financial Instruments and Hedging Activities - Additional Information (Detail) false false R107.htm 1108 - Disclosure - Derivative Financial Instruments and Hedging Activities - Summary of Interest Rate Swaps Designated as Fair Value Hedges (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesSummaryOfInterestRateSwapsDesignatedAsFairValueHedges Derivative Financial Instruments and Hedging Activities - Summary of Interest Rate Swaps Designated as Fair Value Hedges (Detail) false false R108.htm 1109 - Disclosure - Derivative Financial Instruments and Hedging Activities - Summary of Interest Rate Swap Components (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesSummaryOfInterestRateSwapComponents Derivative Financial Instruments and Hedging Activities - Summary of Interest Rate Swap Components (Detail) false false R109.htm 1110 - Disclosure - Derivative Financial Instruments and Hedging Activities - Summary of Interest Rate Swaps Not Designated as Hedging Instruments (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesSummaryOfInterestRateSwapsNotDesignatedAsHedgingInstruments Derivative Financial Instruments and Hedging Activities - Summary of Interest Rate Swaps Not Designated as Hedging Instruments (Detail) false false R110.htm 1111 - Disclosure - Income Taxes - Summary of Income Tax Expense (Benefit) (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureIncomeTaxesSummaryOfIncomeTaxExpenseBenefit Income Taxes - Summary of Income Tax Expense (Benefit) (Detail) false false R111.htm 1112 - Disclosure - Income Taxes - Details of Deferred Tax Asset (Liability), Net (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureIncomeTaxesDetailsOfDeferredTaxAssetLiabilityNet Income Taxes - Details of Deferred Tax Asset (Liability), Net (Detail) false false R112.htm 1113 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureIncomeTaxesAdditionalInformation Income Taxes - Additional Information (Detail) false false R113.htm 1114 - Disclosure - Income Taxes - Reconciliation of Federal Statutory Income Tax (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureIncomeTaxesReconciliationOfFederalStatutoryIncomeTax Income Taxes - Reconciliation of Federal Statutory Income Tax (Detail) false false R114.htm 1115 - Disclosure - Loss Per Common Share - Summary of Loss Per Common Share Computation (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureLossPerCommonShareSummaryOfLossPerCommonShareComputation Loss Per Common Share - Summary of Loss Per Common Share Computation (Detail) false false R115.htm 1116 - Disclosure - Loss Per Common Share - Summary of Loss Per Common Share Computation (Parenthetical) (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureLossPerCommonShareSummaryOfLossPerCommonShareComputationParenthetical Loss Per Common Share - Summary of Loss Per Common Share Computation (Parenthetical) (Detail) false false R116.htm 1117 - Disclosure - Regulatory Matters - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureRegulatoryMattersAdditionalInformation Regulatory Matters - Additional Information (Detail) false false R117.htm 1118 - Disclosure - Regulatory Matters - Risk-Based Capital Ratios (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureRegulatoryMattersRiskBasedCapitalRatios Regulatory Matters - Risk-Based Capital Ratios (Detail) false false R118.htm 1119 - Disclosure - Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsSummaryOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) false false R119.htm 1120 - Disclosure - Fair Value of Financial Instruments - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsAdditionalInformation Fair Value of Financial Instruments - Additional Information (Detail) false false R120.htm 1121 - Disclosure - Fair Value of Financial Instruments - Summary of Level 3 Fair Value Measurement Activity (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsSummaryOfLevel3FairValueMeasurementActivity Fair Value of Financial Instruments - Summary of Level 3 Fair Value Measurement Activity (Detail) false false R121.htm 1122 - Disclosure - Fair Value of Financial Instruments - Summary of Assets Measured at Fair Value on Non Recurring Basis (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsSummaryOfAssetsMeasuredAtFairValueOnNonRecurringBasis Fair Value of Financial Instruments - Summary of Assets Measured at Fair Value on Non Recurring Basis (Detail) false false R122.htm 1123 - Disclosure - Fair Value of Financial Instruments - Valuation Methods for Determining Fair Value of Impairment Loans (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsValuationMethodsForDeterminingFairValueOfImpairmentLoans Fair Value of Financial Instruments - Valuation Methods for Determining Fair Value of Impairment Loans (Detail) false false R123.htm 1124 - Disclosure - Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsCarryingAmountsAndEstimatedFairValuesOfFinancialInstruments Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) false false R124.htm 1125 - Disclosure - Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values of Financial Instruments (Parenthetical) (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsParenthetical Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values of Financial Instruments (Parenthetical) (Detail) false false R125.htm 1126 - Disclosure - Related Party Transactions - Summary of Loans to Related Parties (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureRelatedPartyTransactionsSummaryOfLoansToRelatedParties Related Party Transactions - Summary of Loans to Related Parties (Detail) false false R126.htm 1127 - Disclosure - Related Party Transactions - Additional Information (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformation Related Party Transactions - Additional Information (Detail) false false R127.htm 1128 - Disclosure - Related Party Transactions - Summary of Leases (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureRelatedPartyTransactionsSummaryOfLeases Related Party Transactions - Summary of Leases (Detail) false false R128.htm 1129 - Disclosure - Related Party Transactions - Summary of Leases (Parenthetical) (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureRelatedPartyTransactionsSummaryOfLeasesParenthetical Related Party Transactions - Summary of Leases (Parenthetical) (Detail) false false R129.htm 1130 - Disclosure - Condensed Financial Information of Parent Company - Condensed Statements of Financial Condition (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureCondensedFinancialInformationOfParentCompanyCondensedStatementsOfFinancialCondition Condensed Financial Information of Parent Company - Condensed Statements of Financial Condition (Detail) false false R130.htm 1131 - Disclosure - Condensed Financial Information of Parent Company - Condensed Statements of Operations (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureCondensedFinancialInformationOfParentCompanyCondensedStatementsOfOperations Condensed Financial Information of Parent Company - Condensed Statements of Operations (Detail) false false R131.htm 1132 - Disclosure - Condensed Financial Information of Parent Company - Condensed Statements of Cash Flows (Detail) Sheet http://www.sunnationalbank.com/taxonomy/role/DisclosureCondensedFinancialInformationOfParentCompanyCondensedStatementsOfCashFlows Condensed Financial Information of Parent Company - Condensed Statements of Cash Flows (Detail) true false All Reports Book All Reports Element invest_DerivativeNotionalAmount had a mix of decimals attribute values: -5 -3. Element snbc_CashIncludedInAssetsHeldForSale had a mix of decimals attribute values: -6 -3. Element snbc_HedgeCommercialLoanAdjustmentToMarketChange had a mix of decimals attribute values: -5 -2. Element snbc_LoansHeldForSale had a mix of decimals attribute values: -6 -3. Element snbc_PropertyPlantAndEquipmentHeldForSale had a mix of decimals attribute values: -6 -3. Element us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs had a mix of decimals attribute values: -5 -3. Element us-gaap_AvailableForSaleSecuritiesGrossRealizedGains had a mix of decimals attribute values: -5 -3. Element us-gaap_CapitalLeaseObligations had a mix of decimals attribute values: -5 -3. Element us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets had a mix of decimals attribute values: 3 4. Element us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3 had a mix of decimals attribute values: -3 0. Element us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue had a mix of decimals attribute values: -3 0. Element us-gaap_LoansHeldForSaleMortgages had a mix of decimals attribute values: -3 0. Element us-gaap_OperatingLossCarryforwards had a mix of decimals attribute values: -5 -4. Element us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets had a mix of decimals attribute values: 3 4. Element us-gaap_TierOneRiskBasedCapital had a mix of decimals attribute values: -5 -3. Element us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets had a mix of decimals attribute values: 3 4. Element us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets had a mix of decimals attribute values: 2 4. 'Monetary' elements on report '1056 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1062 - Disclosure - Branch Sales and Consolidations - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1065 - Disclosure - Investment Securities - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1070 - Disclosure - Loans Receivable - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1072 - Disclosure - Allowance for Loan Losses - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1077 - Disclosure - Allowance for Loan Losses - Company's Analysis of Past Due Held-for-Investment Loans (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1089 - Disclosure - Advances from the Federal Home Loan Bank of New York - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1093 - Disclosure - Stock-Based Incentive Plans - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1104 - Disclosure - Commitments and Contingent Liabilities - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1107 - Disclosure - Derivative Financial Instruments and Hedging Activities - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1113 - Disclosure - Income Taxes - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1117 - Disclosure - Regulatory Matters - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1120 - Disclosure - Fair Value of Financial Instruments - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1123 - Disclosure - Fair Value of Financial Instruments - Valuation Methods for Determining Fair Value of Impairment Loans (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '1124 - Disclosure - Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail)' had a mix of different decimal attribute values. Process Flow-Through: 1003 - Statement - Consolidated Statements of Financial Condition Process Flow-Through: Removing column 'Dec. 31, 2012' Process Flow-Through: Removing column 'Dec. 31, 2011' Process Flow-Through: 1004 - Statement - Consolidated Statements of Financial Condition (Parenthetical) Process Flow-Through: Removing column 'Dec. 31, 2012' Process Flow-Through: Removing column 'Dec. 31, 2011' Process Flow-Through: 1005 - Statement - Consolidated Statements of Operations Process Flow-Through: 1006 - Statement - Consolidated Statements of Operations (Parenthetical) Process Flow-Through: 1007 - Statement - Consolidated Statements of Comprehensive Loss Process Flow-Through: 1009 - Statement - Consolidated Statements of Cash Flows snbc-20141231.xml snbc-20141231.xsd snbc-20141231_cal.xml snbc-20141231_def.xml snbc-20141231_lab.xml snbc-20141231_pre.xml true true