Document And Entity Information Capital required for capital adequacy, with capital buffer The minimum amount of Total Capital, including a capital buffer, required for capital adequacy purposes under the regulatory framework for prompt corrective action. Note To Financial Statement Details Textual Tier one risk-based capital required for capital adequacy, with capital buffer The minimum amount of Tier 1 Risk Based Capital, including a capital buffer, required for capital adequacy purposes under the regulatory framework for prompt corrective action. Significant Accounting Policies us-gaap_InterestExpenseNegotiableOrderOfWithdrawalNOWDeposits Demand- interest bearing Investment securities held to maturity, at fair value Total, held to maturity, fair value Note 2 - Summary of Significant Accounting Policies Note 3 - Investment Securities Interest expense: Tier one leverage capital required for capital adequacy, with capital buffer The minimum amount of Tier 1 Leverage Capital, including a capital buffer, required for capital adequacy purposes under the regulatory framework for prompt corrective action. Note 4 - Loans Receivable Total capital (to risk-weighted assets) The minimum Total risk based capital ratio (total capital divided by risk weighted assets), including a capital buffer, required for capital adequacy purposes under the regulatory framework for prompt corrective action. Note 5 - Allowances for Loan Losses Total, held to maturity, amortized cost Investment securities held to maturity, at amortized cost (fair value of $463,799 and $425,183, respectively) Investment securities held to maturity, at amortized cost Common equity tier one risk-based capital required for capital adequacy, with capital buffer The minimum amount of Common Equity Tier 1 Risk Based Capital, including a capital buffer, required for capital adequacy purposes under the regulatory framework for prompt corrective action. frbk_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValueAmount Share Based Compensation Arrangement by Share Based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value Amount The aggregate amount of weighted average grant-date fair value of options vested. Note 6 - Other Real Estate Owned Note 7 - Premises and Equipment Common equity tier 1 capital (CET1) The minimum Common Equity Tier One Capital Ratio (Common Equity Tier one capital divided by risk-weighted assets), including a capital buffer, required for capital adequacy purposes under the regulatory framework for prompt corrective action. frbk_AnnualAnnuityPayments Annual Annuity Payments Amount of annuity payments to which certain officers and directors are entitled upon retirement or death. Note 9 - Deposits us-gaap_AvailableForSaleSecuritiesDebtSecurities Total, available for sale, fair value Note 10 - Income Taxes Note 12 - Commitments and Contingencies Tier 1 capital (to risk weighted assets) The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets), including a capital buffer, required for capital adequacy purposes under the regulatory framework for prompt corrective action. frbk_DeferredCompensationPlanBenefitsNumberOfYearsToVest Deferred Compensation Plan, Benefits, Number of Years to Vest Vesting period of Company contributions (in years) to deferred compensation plan for certain officers and directors. Note 13 - Regulatory Capital us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral Available-for-sale Securities Pledged as Collateral Note 15 - Fair Value Measurements and Fair Values of Financial Instruments Tier one leverage capitalrequired for capital adequacy to average assets, with capital buffer The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets and increased by a capital buffer, as defined in the regulations. frbk_AnnuityPaymentMaximumContractualTerm Annuity Payment, Maximum Contractual Term The maximum term of the retirement or death benefit compensation arrangement. Note 16 - Stock Based Compensation Total income Consolidation, Variable Interest Entity, Policy [Policy Text Block] frbk_RetirementAgeToBeAttainedToReceivePostretirementBenefits Retirement Age to Be Attained to Receive Postretirement Benefits Minimum age to qualify for payments under a benefit plan. Note 19 - Parent Company Financial Information Interest income Total interest income Stock held by deferred compensation plan (in shares) Deferred Compensation Plan, Shares Held The number of shares of the entity's stock held in deferred compensation plan for payment of future benefits. Note 20 - Quarterly Financial Data (Unaudited) frbk_FinancingReceivableModificationsIncreaseInPrincipalBalance Financing Receivable, Modifications, Increase in Principal Balance Amount of investment in financing receivables increased in related to the modification. Note 21 - Changes in Accumulated Other Comprehensive Income (Loss) By Component (1) frbk_DeferredCompensationPlanAmountVested Deferred Compensation Plan, Amount Vested Amount of benefits that have vested. Note 22 - Business Combination Converted From Line of Credit to Term Loan With Five Year Maturity [Member] Loan modification for conversion of a financing receivable from line of credit to term loan with five year maturity. frbk_DeferredCompensationPlanSharesAcquired Deferred Compensation Plan, Shares Acquired Number of shares (or other type of equity)acquired during the period to help fund deferred compensation plan. Note 23 - Goodwill and Other Intangibles Investment securities available for sale, at fair value Investment securities available for sale, at fair value Note 24 - Derivatives and Risk Management Activities Note 2 - Summary of Significant Accounting Policies - Calculation of EPS (Details) Increase in Principal Blance and Reduction in Interest Rate [Member] Loan modification for an increase in the principal balance and reduction in the interest rate. Note 2 - Summary of Significant Accounting Policies - Anti-dilutive Securities (Details) Note 3 - Investment Securities - Unrealized Gain (Loss) on Investments (Details) Note 3 - Investment Securities - Investment Securities by Contractual Maturity (Details) Note 3 - Investment Securities - Credit-related Impairment Losses on Securities (Details) Note 3 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) Note 3 - Investment Securities - Trust Preferred Securities (Details) Note 4 - Loans Receivable - Gross Loans by Major Categories (Details) Note 4 - Loans Receivable - Related Party Loans (Details) Interest on federal funds sold and other interest-earning assets Note 5 - Allowances for Loan Losses - Activity in Allowance for Loan Losses (Details) Note 5 - Allowances for Loan Losses - Impaired Loans (Details) Note 5 - Allowances for Loan Losses - Past Due Loans (Details) Republic Capital Trust IV [Member] Refers to information regarding the entity called Republic Capital Trust IV. Note 5 - Allowance for Loan Losses - Loans by Internal Risk Rating (Details) Note 5 - Allowances for Loan Losses - Non-accrual Loans (Details) Note 5 - Allowances for Loan Losses - Troubled Debt Restructurings (Details) Note 6 - Other Real Estate Owned - Reconciliation of Other Real Estate Owned (Details) Oak Mortgage [Member] Related to the acquisition of Oak Mortgage. Note 7 - Premises and Equipment - Premises and Equipment (Details) Republic Capital Trust III [Member] Refers to information regarding the entity Republic Capital Trust III. Note 9 - Deposits - Contractual Maturities of the Certificates of Deposit (Details) frbk_PeriodBeforeEscrowDisbursement Period Before Escrow Disbursement The amount of time, after the closing of certain contractual commitments, before funds in escrow may be disbursed. Note 10 - Income Taxes - Income Tax Expense (Benefit) (Details) Note 10 - Income Taxes - Income Tax Reconciliation (Details) Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) us-gaap_FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd Federal Home Loan Bank, Advances, Activity for Year, Maximum Outstanding at any Month End Note 12 - Commitments and Contingencies - Minimum Annual Rental Payments (Details) Note 13 - Regulatory Capital - Capital Regulatory Ratios (Details) Interest and dividends on taxable investment securities Note 13 - Regulatory Capital - Required Capital Ratios with Conversion Buffers (Details) Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - Financial Assets Measured at on a Recurring Basis (Details) Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - SBA Servicing Assets Activity (Details) Interest and dividends on tax-exempt investment securities Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - Assets Measured on a Recurring Basis Using Significant Unobservable Inputs (Details) Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - Assets Measured on a Nonrecurring Basis (Details) Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - Quantitative Information about Level 3 Assets (Details) Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - Disclosure of Mortgage Held for Sale (Details) Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - SBA Servicing Assets Sensitivity Analysis (Details) Corporation-obligated mandatorily redeemable capital securities of subsidiary trust holding junior obligations of the corporation Interest and fees on taxable loans Mortgage banking income Mortgage baking income includes primarily gains and losses on loan sales and the changes in fair values of derivatives. Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - Fair Values of Financial Instruments (Details) Investment in subsidiaries Note 16 - Stock Based Compensation - Valuation Assumptions (Details) Note 16 - Stock Based Compensation - Stock-based Compensation (Details) Federal Home Loan Bank of Pittsburgh [Member] Note 16 - Stock Based Compensation - Stock Option Activity (Details) Note 16 - Stock Based Compensation - Stock Option Exercises (Details) Note 16 - Stock Based Compensation - Options Outstanding (Details) Note 16 - Stock Based Compensation - Roll-forward of Non-vested Options (Details) Note 19 - Parent Company Financial Information - Balance Sheet (Details) Interest and fees on tax-exempt loans Federal Home Loan Bank Branch [Domain] Note 19 - Parent Company Financial Information - Statements of Income, Comprehensive Income (Loss), and Changes in Shareholders' Equity (Details) Federal Home Loan Bank Branch [Axis] Note 19 - Parent Company Financial Information - Statements of Cash Flows (Details) Note 20 - Quarterly Financial Data (Unaudited) - Summary of Selected Quarterly Financial Data (Details) Note 21 - Changes in Accumulated Other Comprehensive Income (Loss) By Component (1) - Accumulated Other Comprehensive Loss (Details) Note 22 - Business Combination - Consideration Paid and Assets Acquired and Liabilities Assumed (Details) Note 23 - Goodwill and Other Intangibles - Summary of Goodwill and Other Intangibles (Details) Note 24 - Derivatives and Risk Management Activities - Amounts Recorded in Statement to Financial Condition (Details) Note 24 - Derivatives and Risk Management Activities - Derivative Instrument Gain (Loss) Recorded in Statement of Income (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] us-gaap_PriorPeriodReclassificationAdjustment Prior Period Reclassification Adjustment New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_InterestAndFeeIncomeLoansHeldForSaleMortgages Interest and Fee Income, Loans Held-for-sale, Mortgages Reclassification, Policy [Policy Text Block] Related Party Transaction [Domain] Other real estate owned, net Real Estate Acquired Through Foreclosure Related Party Transaction [Axis] Cumulative OTTI Life to Date Beginning Balance Ending Balance us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold Reductions for securities sold during the period Subsequent Event [Member] Director [Member] Additional credit-related impairment loss on securities for which an other-than-temporary impairment was previously recognized Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses Related Party [Axis] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block] Subsequent Event Type [Domain] Subsequent Event Type [Axis] Related Party [Domain] Cash and due from banks Cash us-gaap_Cash Interest bearing deposits with banks Pension and Other Postretirement Benefits Disclosure [Text Block] us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense Deferred Compensation Arrangement with Individual, Compensation Expense Held to maturity securities in a continuous unrealized loss position, fair value Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value Relationship to Entity [Domain] Title of Individual [Axis] Certificates of Deposit, thereafter Certificates of Deposit, 2022 Certificates of Deposit, 2019 Certificates of Deposit, 2021 Certificates of Deposit, 2020 Certificates of Deposit, 2018 No specific maturity date, held to maturity, fair value No specific maturity date, held to maturity, amortized cost Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Demand - non-interest bearing After 10 years, held to maturity, fair value After 5 years to 10 years, held to maturity, fair value After 1 year to 5 years, held to maturity, fair value Due in 1 year or less, held to maturity, fair value After 1 year to 5 years, held to maturity, amortized cost us-gaap_ServicingAsset Servicing Asset Due in 1 year or less, held to maturity, amortized cost After 10 years, held to maturity, amortized cost After 5 years to 10 years, held to maturity, amortized cost Fair Value of SBA Servicing Asset SBA Servicing Assets Beginning balance, January 1st Ending balance, December 31st us-gaap_ImpairmentOfInvestments Impairment charges on Level 3 Held to maturity securities in a continuous unrealized loss position, unrealized losses Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses Investment securities held to maturity, gross unrealized gains Demand - interest bearing us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss Investment securities held to maturity, gross unrealized losses Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses us-gaap_FinancingReceivableAllowanceForCreditLosses Total allowance for loan losses Beginning balance Ending balance us-gaap_OtherRealEstate Beginning Balance Ending Balance Real Estate, Policy [Policy Text Block] us-gaap_OtherRealEstateAndForeclosedAssets Other real estate owned us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit Time Deposits, at or Above FDIC Insurance Limit Deposit Liabilities Disclosures [Text Block] us-gaap_DeferredTaxAssetsValuationAllowance Deferred Tax Assets, Valuation Allowance Less: valuation allowance us-gaap_CashSurrenderValueOfLifeInsurance Cash Surrender Value of Life Insurance Loans receivable, allowance for loan losses Allowance for loan losses Loans receivable (net of allowance for loan losses of $8,599 and $9,155, respectively) Net loans receivable Loans receivable Total loans receivable us-gaap_LoansAndLeasesReceivableDeferredIncome Deferred costs (fees) Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] us-gaap_DeferredIncomeTaxLiabilities Total deferred tax liabilities us-gaap_NoninterestIncomeOtherOperatingIncome Other non-interest income us-gaap_DeferredTaxAssetsGross Total deferred tax assets us-gaap_DeferredTaxAssetsLiabilitiesNet Net deferred tax asset Non-interest income Total non-interest income Other us-gaap_DeferredTaxAssetsOther Non-interest income: us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss Net interest income after provision for loan losses Provision for loan losses us-gaap_NumberOfReportableSegments Number of Reportable Segments Unrealized losses on securities available for sale Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross us-gaap_InterestIncomeExpenseNet Net interest income Interest income Interest income on non-accrual loans Realized losses in other than temporary impairment charge us-gaap_FederalHomeLoanBankStock Federal Home Loan Bank Stock Interest and Fees [Member] Represents information pertaining to the income statement line item, Interest and Fees. Segment Reporting Disclosure [Text Block] us-gaap_CashCashEquivalentsAndFederalFundsSold Cash and cash equivalents Cash and cash equivalents, beginning of year Cash and cash equivalents, end of year Service fees on deposit accounts Derivative Instruments and Hedging Activities Disclosure [Text Block] Allowance for loan losses us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Deferred compensation Earnings Per Share, Policy [Policy Text Block] Mandatory Forward Loan Sales Commitments [Member] Represents information pertaining to mandatory forward loan sales commitments. Comprehensive Income, Policy [Policy Text Block] Best Efforts Forward Loan sales Commitments [Member] Represents information pertaining to best efforts forward loan sales commitments. Income Tax, Policy [Policy Text Block] Net operating loss carryforward Deferred Tax Assets, Operating Loss Carryforwards Aggregate Unpaid Principal Balance Amount of unpaid principal balance of mortgage loans held for sale. Deferred tax assets Excess Carrying Amount Over Aggregate Unpaid Principle Balance The amount of mortgage loans held for sale in excess of the unpaid principal balance. us-gaap_DeferredTaxLiabilitiesOther Other us-gaap_IntangibleAssetsNetIncludingGoodwill Total Total Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Amendment Flag Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance [Table Text Block] Tabular disclosure for other derivative instruments not designated as hedging instruments of the location and amount of gains and losses reported in the statement of financial performance. frbk_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNetTotal Net assets acquired, adjustments This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with identifiable assets acquired in excess of (less than) the aggregate liabilities assumed in connection with business combination for which the initial accounting was incomplete. Other liabilities, adjustments This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to other liabilities assumed in connection with a business combination for which the initial accounting was incomplete. Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Position [Table Text Block] Tabular disclosure for other derivative instruments not designated as hedging instruments of the location and fair value amounts of the instruments reported in the statement of financial position. Deferred loan costs Advertising Costs, Policy [Policy Text Block] Current Fiscal Year End Date frbk_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLiabilitiesTotal Total liabilities, adjustments This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to total liabilities assumed in connection with a business combination for which the initial accounting was incomplete. Document Fiscal Period Focus Document Fiscal Year Focus Document Period End Date Non-compete agreements, amortization period (Year) Deferred tax liabilities Document Type Document Information [Line Items] Document Information [Table] Entity Public Float Entity Filer Category Entity Current Reporting Status Entity Voluntary Filers Entity Well-known Seasoned Issuer us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability State Entity Central Index Key Entity Registrant Name Entity [Domain] Legal Entity [Axis] Federal Entity Common Stock, Shares Outstanding (in shares) Stockholders' Equity, Policy [Policy Text Block] Loan and servicing fees Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Trading Symbol Comprehensive Income (Loss) Note [Text Block] Guarantees, Indemnifications and Warranties Policies [Policy Text Block] Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Appraisal and other loan expenses Regulatory assessments and costs Non-interest expense Total non-interest expense Other operating expenses Other real estate owned us-gaap_PropertyPlantAndEquipmentUsefulLife Property, Plant and Equipment, Useful Life Condensed Financial Information of Parent Company Only Disclosure [Text Block] Construction in Progress [Member] ASSETS Non-interest expenses: Furniture and Fixtures [Member] Net cash provided by financing activities Net cash provided by financing activities Net cash used in investing activities Net cash used in investing activities Net cash used in operating activities Net cash (used in) provided by operating activities Leasehold Improvements [Member] Increase (decrease) in cash Net increase (decrease) in cash and cash equivalents Building [Member] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Axis] Land [Member] Property, Plant and Equipment, Policy [Policy Text Block] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Transfers and Servicing of Financial Assets, Policy [Policy Text Block] Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges [Policy Text Block] Derivatives, Policy [Policy Text Block] Net proceeds from exercise of stock options Net proceeds from stock offering Proceeds from Issuance of Common Stock Investment, Policy [Policy Text Block] Concentration Risk, Credit Risk, Policy [Policy Text Block] Related allowance us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod Impaired Financing Receivable, Interest Income, Accrual Method With related allowance recorded - Interest income recognized Recorded investment With related allowance - Recorded investment With no related allowance recorded - Interest income recognized Average recorded investment Impaired Financing Receivable, Average Recorded Investment With related allowance recorded - Average recorded investment With no related allowance - Recorded investment Unpaid principal balance With related allowance - Unpaid principal balance With no related allowance recorded - Average recorded investment us-gaap_ProceedsFromRepurchaseOfTrustPreferredSecurities Proceeds from (Repurchase of) Trust Preferred Securities With no related allowance - Unpaid principal balance Asset Class [Axis] Asset Class [Domain] Weighted average shares outstanding (including dilutive CSEs) (in shares) Anti-dilutive securities (in shares) Weighted average shares outstanding (in shares) us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet Net assets acquired us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities Total liabilities Warehouse lines of credit Diluted (in dollars per share) us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther Other liabilities Consumer Portfolio Segment [Member] Commercial Real Estate Portfolio Segment [Member] Unallocated Financing Receivables [Member] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Axis] Liabilities assumed: Residential Portfolio Segment [Member] Commercial Portfolio Segment [Member] us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets Total assets Basic (in dollars per share) us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment Premises and equipment Loans and Leases Receivable, Mortgage Banking Activities, Policy [Policy Text Block] us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets Other assets Schedule of Financing Receivables, Non Accrual Status [Table Text Block] Intangible assets – non compete agreements us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables Loans receivable Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents Cash and cash equivalents Finance, Loans and Leases Receivable, Policy [Policy Text Block] us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt Proceeds from Issuance of Subordinated Long-term Debt Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block] Assets acquired: Value of consideration Cash and Cash Equivalents, Policy [Policy Text Block] Basis of Accounting, Policy [Policy Text Block] Consideration paid: Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Equity instruments Significant Accounting Policies [Text Block] Accounting Policies [Abstract] Subsidiaries [Member] Parent Company [Member] Statement of Financial Position [Abstract] Consolidated Entities [Domain] (Repayment) increase in short-term borrowings Consolidated Entities [Axis] Condensed Cash Flow Statement [Table Text Block] Statement of Cash Flows [Abstract] Statement of Stockholders' Equity [Abstract] Condensed Balance Sheet [Table Text Block] us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss Business Acquisition, Pro Forma Net Income (Loss) us-gaap_BusinessAcquisitionsProFormaRevenue Business Acquisition, Pro Forma Revenue Quarterly Financial Information [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Unrealized Gain (Loss) on Investments [Table Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Intangible Assets and Goodwill [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value Measurements, Nonrecurring [Table Text Block] us-gaap_OperatingLossCarryforwards Operating Loss Carryforwards Derivative Liability, Notional Amount Derivative Asset, Notional Amount Net increase (decrease) in time deposits Net increase in demand, money market and savings deposits Cash flows from financing activities Class of Stock [Axis] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Special Mention [Member] Doubtful [Member] Substandard [Member] us-gaap_IncomeTaxReconciliationOtherReconcilingItems Other us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effect of change in tax rate Not Designated as Hedging Instrument [Member] Deferred tax asset valuation allowance adjustment Hedging Designation [Domain] us-gaap_LoansAndLeasesReceivableRelatedParties Loans and Leases Receivable, Related Parties Balance at beginning of year Balance at end of year us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries Investment in subsidiary Hedging Designation [Axis] us-gaap_IncomeTaxReconciliationTaxExemptIncome Tax exempt interest Cash Payments to Acquire Businesses, Gross Share-based Compensation, Activity [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Share-based Compensation, Stock Options, Activity [Table Text Block] Goodwill resulting from acquisition of Oak Mortgage, adjustments Schedule of Nonvested Share Activity [Table Text Block] Goodwill, additions/adjustments Schedule of Business Acquisitions, by Acquisition [Table Text Block] Business Combination Disclosure [Text Block] us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate Tax provision computed at statutory rate Proceeds from the paydowns, maturity or call of securities held to maturity Income Tax Disclosure [Text Block] Proceeds from the paydowns, maturity or call of securities available for sale Proceeds from the sale of securities available for sale Proceeds from Sale of Available-for-sale Securities us-gaap_GuaranteeObligationsCurrentCarryingValue Guarantor Obligations, Current Carrying Value us-gaap_GuaranteeObligationsMaximumExposure Guarantor Obligations, Maximum Exposure, Undiscounted Pass [Member] Subprime [Member] Long-term Debt, Type [Axis] Non-compete agreements, additions/adjustments Long-term Debt, Type [Domain] Internal Credit Assessment [Domain] Internal Credit Assessment [Axis] Guarantor Obligations, Nature [Axis] us-gaap_PaymentsToAcquireHeldToMaturitySecurities Purchase of investment securities held to maturity us-gaap_PaymentsToAcquireAvailableForSaleSecurities Purchase of investment securities available for sale Guarantor Obligations, Nature [Domain] Subordinated Debt [Member] Primary financial statement caption encompassing subordinated debt. Goodwill and Intangible Assets Disclosure [Text Block] us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Premises and equipment expenditures Net income Net income us-gaap_RelatedPartyDepositLiabilities Related Party Deposit Liabilities Troubled debt restructurings Financing Receivable, Modifications, Recorded Investment Antidilutive Securities, Name [Domain] Employee Stock Option [Member] Convertible Debt Securities [Member] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Non-cash transfers from loans to other real estate owned us-gaap_DebtInstrumentConvertibleConversionPrice1 Debt Instrument, Convertible, Conversion Price Schedule of Related Party Transactions [Table Text Block] us-gaap_RelatedPartyTransactionAmountsOfTransaction Related Party Transaction, Amounts of Transaction Antidilutive Securities [Axis] us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 Financing Receivable, Modifications, Subsequent Default, Number of Contracts us-gaap_FinancingReceivableModificationsNumberOfContracts2 Financing Receivable, Modifications, Number of Contracts Related Party Transactions Disclosure [Text Block] us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 Financing Receivable, Modifications, Pre-Modification Recorded Investment Loan Restructuring Modification [Axis] Supplemental disclosures Income taxes paid Loan Restructuring Modification [Domain] Impaired Financing Receivables [Table Text Block] Troubled Debt Restructurings on Financing Receivables [Table Text Block] Debt Instrument [Axis] Debt Instrument, Name [Domain] us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate us-gaap_DebtInstrumentInterestRateStatedPercentage Debt Instrument, Interest Rate, Stated Percentage Performance Guarantee Expiring in 2020 [Member] Refers to information regarding the performance guarantee expiring in 2020. Performance Guarantee Expiring in 2024 [Member] Refers to information regarding the performance guarantee expiring in 2024. Mandatory Forward Loan Sales Commitments, Policy [Policy Text Block] Disclosure of accounting policy for mandatory forward loan sales commitments. Financing Receivable Credit Quality Indicators [Table Text Block] Loans receivable, current Loans receivable greater than 90 days and accruing Non-accrual loans Net proceeds from sale of other real estate owned Loans receivable, total past due Lowest Credit Rating Assigned Net income per share Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Financing Receivables, 60 to 89 Days Past Due [Member] Asset Derivatives [Member] Information pertaining to asset derivatives. London Interbank Offered Rate (LIBOR) [Member] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Axis] Financing Receivables, 30 to 59 Days Past Due [Member] Liability Derivatives [Member] Information pertaining to liability derivatives. Variable Rate [Domain] Variable Rate [Axis] Past Due Financing Receivables [Table Text Block] us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax frbk_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetValuationAllowance Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax Asset Valuation Allowance Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax asset valuation allowance for enacted changes in tax laws or rates or a change in the tax status of the entity. us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock Net (purchase) redemption of restricted stock Agency Mortgage-backed Securities [Member] Information pertaining to agency mortgage-backed securities. Cash flows from investing activities Reported Value Measurement [Member] Stock options issued in acquisition Amount of increase in additional paid in capital (APIC) resulting from the issuance of stock options in an acquisition. Net (decrease) increase in other liabilities frbk_CommonEquityTierOneDeductionsAndOtherAdjustmentsPhaseOne Common Equity Tier 1, Deductions and Other Adjustments, Phase 1 The percentage of decrease applied to common equity tier 1 for deductions and other adjustments during the first phase. Schedule of Compliance with Regulatory Capital Requirements with Conversion Buffers [Table Text Block] Tabular disclosure of the capital amounts and ratios as of the balance sheet date, calculated with conversion buffers. Total comprehensive income (loss) Total comprehensive income (loss) Other comprehensive income (loss), net of tax frbk_CommonEquityTierOneDeductionsAndOtherAdjustmentsPhaseTwo Common Equity Tier 1, Deductions and Other Adjustments, Phase 2 The percentage of decrease applied to common equity tier 1 for deductions and other adjustments during the second phase. frbk_CommonEquityTierOneDeductionsAndOtherAdjustmentsPhaseThree Common Equity Tier 1, Deductions and Other Adjustments, Phase 3 The percentage of decrease applied to common equity tier 1 for deductions and other adjustments during the third phase. Net increase (decrease) in accrued interest payable and other liabilities Quarterly Financial Information [Text Block] Preferred stock, shares outstanding (in shares) Common stock, shares outstanding (in shares) us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Lender [Domain] Lender Name [Axis] Fair Value, Option, Quantitative Disclosures [Table Text Block] us-gaap_DebtConversionConvertedInstrumentSharesIssued1 Debt Conversion, Converted Instrument, Shares Issued Conversion of subordinated debt to common stock us-gaap_DebtConversionOriginalDebtAmount1 Debt Conversion, Original Debt, Amount Debt Disclosure [Text Block] Stock based compensation Discount Rate Offering costs Conditional prepayment rate us-gaap_TreasuryStockValue Treasury stock at cost (503,408 shares as of December 31, 2017 and December 31, 2016) Valuation Technique [Domain] us-gaap_IncreaseDecreaseInOtherOperatingAssets Increase in other assets Valuation Technique [Axis] Income Approach Valuation Technique [Member] Market Approach Valuation Technique [Member] Other Debt Obligations [Member] Conversion of subordinated debt, shares (in shares) Junior Subordinated Debt [Member] Fair Value by Liability Class [Domain] Conversion of subordinated debt to common stock (36,922 shares) Conversion of subordinated debt to common shares Liability Class [Axis] Fair Value Inputs, Assets, Quantitative Information [Table Text Block] Stock based compensation expense recognized Unrealized (losses) gains Loans evaluated individually Options exercised (in shares) Exercised, shares (in shares) us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet Increase in accrued interest receivable and other assets Options exercised Loans evaluated collectively Allowance for loan losses, collectively evaluated for impairment Realized losses Allowance for loan losses, individually evaluated for impairment Recoveries us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs Charge-offs us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Forfeited, shares (in shares) Granted, number of shares (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Allowance for Credit Losses on Financing Receivables [Table Text Block] Shares issued (in shares) Proceeds from shares issued under common stock offering, net of offering costs Total Liabilities and Shareholders’ Equity Total Liabilities and Shareholders’ Equity us-gaap_IncreaseDecreaseInNotesReceivables Net increase in loans Accumulated deficit Accumulated other comprehensive loss us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale Mortgage loans originated for sale us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue Balance Balance Proceeds from sales of mortgage loans originated for sale us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements Paydowns Security transferred to Level 3 measurement us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales Proceeds from sales us-gaap_AmountAvailableForDividendDistributionWithoutAffectingCapitalAdequacyRequirements Amount Available for Dividend Distribution without Affecting Capital Adequacy Requirements Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Money market and savings Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts. Also includes amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs). Unobservable Input frbk_InterestExpenseOnMoneyMarketAndSavingsDeposits Money market and savings Interest expense incurred on all money market deposits and Interest expense incurred on all savings account deposits. Fair Value, Measurements, Nonrecurring [Member] Fair Value, Measurements, Recurring [Member] Valuation Technique Fair Value, Measurement Frequency [Domain] Measurement Frequency [Axis] Property, Plant and Equipment [Table Text Block] Property, Plant and Equipment Disclosure [Text Block] us-gaap_ServicingFees Servicing Fees us-gaap_OperatingLeasesRentExpenseNet Operating Leases, Rent Expense, Net Amortization of net unrealized holding losses to income during the period, pre-tax The amount of expense charged against earnings by an entity to record the amortization of gains and losses on securities before tax. Amortization of net unrealized holding losses during the period (pre-tax $163, $219 and $173, respectively) The amount of expense charged against earnings by an entity to record the amortization of gains and losses on securities net of tax. Deferred income taxes Write down of other real estate owned Amount of other real estate owned that have been written off. Treasury stock (in shares) Accretion of discounts on retained SBA loans The SBA servicing asset is initially recorded when loans are sold and the servicing rights are retained and recorded on the balance sheet. Updated fair values are obtained on a quarterly basis and adjustments are presented as loan advisory and servicing fees on the consolidated statement of operations. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations. Standby letters-of-credit Common stock, par value $0.01 per share: 100,000,000 shares authorized; shares issued 57,518,609 as of December 31, 2017 and 57,283,712 as of December 31, 2016; shares outstanding 56,989,764 as of December 31, 2017 and 56,754,867 as of December 31, 2016 Fair value adjustments on SBA servicing assets The SBA servicing asset is initially recorded when loans are sold and the servicing rights are retained and recorded on the balance sheet. Updated fair values are obtained on a quarterly basis and adjustments are presented as loan advisory and servicing fees on the consolidated statement of operations. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations. The 2005 Plan [Member] The reporting entity's Stock Option and Restricted Stock Plan or the 2015 Plan. Common stock, shares authorized (in shares) us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations Subordinated debt Common stock, shares issued (in shares) Stock Options and Restricted Stock Plan [Member] Represents the Stock Options and Restricted Stock Plan. The 2014 Republic First Bancorp, Inc. Equity Incentive Plan [Member] Represents the 2014 Republic First Bancorp, Inc. Equity Incentive Plan. Common stock, par value (in dollars per share) Share based compensation Stock based compensation frbk_MinimumPercentageOfOutstandingSharesAsAnnualAdjustment Minimum Percentage of Outstanding Shares as Annual Adjustment Refers to percentage of outstanding shares as an annual adjustment available for grant under the terms of the plan. us-gaap_DepreciationAmortizationAndAccretionNet Depreciation and amortization Risks and Uncertainties and Certain Significant Estimates [Policy Text Block] Description of the business risk faced by the entity due to concentration of revenue from a single source. Preferred stock, par value $0.01 per share: 10,000,000 shares authorized; no shares issued and outstanding us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments Amortization of premiums on investment securities Assumed forfeiture rate(5) The estimated forfeiture rate of the underlying shares over the option's term. Preferred stock, shares issued (in shares) Fair value of unvested stock options Represents the fair value of unvested stock options. Other comprehensive income (loss), net of tax Total other comprehensive loss Net current-period other comprehensive income (loss) Preferred stock, shares authorized (in shares) frbk_NumberOfSecuritiesInInvestmentPortfolio Number of Securities in Investment Portfolio Refers to number of securities included in investment portfolio. Preferred stock par value (in dollars per share) us-gaap_Depreciation Depreciation Estimate of Fair Value Measurement [Member] frbk_SecuritiesContinuousLossPositionAccumulatedLoss Securities, Continuous Loss Position, Accumulated Loss Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity and available-for-sale in a continuous loss position. Measurement Basis [Axis] Portion at Fair Value Measurement [Member] frbk_SecuritiesContinuousUnrealizedLossPositionFairValue Securities, Continuous Unrealized Loss Position, Fair Value This item represents the fair value of securities categorized as held-to-maturity and available-for-sale which are in an unrealized loss position. us-gaap_ServicingAssetAtFairValueAdditions Additions Adjustments to reconcile net income to net cash (used in) provided by operating activities: Fair Value Reclassification adjustment for impairment charge, pre-tax Unrealized loss on securities, pre-tax us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax Reclassification adjustment for securities losses (gains), pre-tax Loans held for sale, at fair value Mortgages Held-for-sale, Fair Value Disclosure Schedule of Trust Preferred Securities [Table Text Block] Tabular disclosure of unrealized losses and collateral information on pooled trust preferred investments. Loans held for sale us-gaap_LoansHeldForSaleFairValueDisclosure Additional paid in capital us-gaap_DeferredCompensationEquity Stock held by deferred compensation plan (25,437 shares as of December 31, 2017 and December 31, 2016) Interest paid Cash and cash equivalents Shareholders’ Equity us-gaap_LettersOfCreditOutstandingAmount Letters of Credit Outstanding, Amount Interest income: Total Shareholders’ Equity Total Shareholders’ Equity Balance Balance Total Liabilities Total Liabilities US Government Agencies Debt Securities [Member] Other liabilities us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities Liability, Defined Benefit Pension Plan Cash flows from operating activities us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability TPREF Funding II [Member] Represents TPREF Funding II. Statement [Line Items] Class / Tranche Represents the class and trance of trust preferred securities. Unrealized loss on securities Net unrealized losses on securities Financial liabilities: Derivative liability Derivative Liability Number of Banks Currently Performing Represents the number of banks currently performing. Deferrals / Defaults as % of Current Balance Represents the current number of deferrals and defaults as a percentage of the current collateral balance. Weighted Average Remaining Term (years) (Year) Accrued interest payable Prepayment Speed Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Loans receivable, net Reclassification adjustment for impairment charge (pre-tax $-, $7 and $3, respectively) Conditional Default Rates for 2018 and beyond Represents conditional default rates for 2017 and beyond. us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax Reclassification adjustment for securities losses (gains) (pre-tax $146, $(656) and $(108), respectively) Interest Rate Lock Commitments [Member] Financial assets: Weighted Average Discount Rate AOCI Attributable to Parent [Member] Unrealized loss on securities (pre-tax $(646), $(6,011), and $(4,021), respectively) Commitments to Extend Credit [Member] Fair Value, by Balance Sheet Grouping [Table Text Block] Accrued expenses Fair Value Disclosures [Text Block] Construction and Land Development Portfolio Segment [Member] Represents the construction and land development portfolio segment. Owner Occupied Real Estate [Member] Represents the owner occupied real estate. us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax Amounts reclassified from accumulated other comprehensive income to net income (2) us-gaap_OperatingLeasesFutureMinimumPaymentsDue Total us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter Thereafter us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears 2021 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears 2022 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears 2019 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears 2020 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent 2018 Financial Instruments [Domain] Financial Instrument [Axis] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 1 [Member] Retained Earnings [Member] Fair Value, Inputs, Level 3 [Member] us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod Line of Credit Facility, Maximum Amount Outstanding During Period Additional Paid-in Capital [Member] us-gaap_LineOfCredit Long-term Line of Credit Treasury Stock [Member] Fair Value Hierarchy [Domain] Deferred Compensation, Share-based Payments [Member] Fair Value, Hierarchy [Axis] Subordinated debt Corporation-obligated mandatorily redeemable securities of subsidiary trust holding solely junior subordinated debentures of the corporation Equity Component [Domain] us-gaap_DeferredFinanceCostsNet Debt Issuance Costs, Net Common Stock [Member] Report Date [Axis] Equity Components [Axis] Financial Statement Filing Date [Domain] Allowance for Credit Losses [Text Block] Other Assets [Member] Other Liabilities [Member] Allowance for loan losses: Loans receivable: Number of Loans Cumulative number of financing receivables that have been modified by troubled debt restructurings. Troubled debt restructurings, accrual status Recorded investment in financing receivables that have undergone troubled debt restructuring and are accruing. us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis Total, available for sale, amortized cost Troubled debt restructurings, non-accrual status Recorded investment in financing receivables that have undergone troubled debt restructuring and are not accruing. frbk_SensitivityAnalysisOfFairValueTransferorsInterestsInTransferredFinancialAssetsImpactOf10PercentAdverseChangeInKeyAssumptionsPercent Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Key Assumptions, Percent The measurement of the hypothetical financial impact of a 10 percent adverse changes in key assumptions on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. frbk_LoansHeldforsaleWritedown Loans Held-for-sale, Write-down The amount of write-down on loans held-for-sale during the period. frbk_SensitivityAnalysisOfFairValueTransferorsInterestsInTransferredFinancialAssetsImpactOf20PercentAdverseChangeInKeyAssumptions Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Key Assumptions The measurement of the hypothetical financial impact of a 20 percent adverse changes in key assumptions on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. Derivative Gain (Loss), Net SBA Servicing Assets [Member] Represents SBA servicing assets. us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax Unrealized Losses Investment securities available for sale, gross unrealized gains Amortized Cost frbk_ImpairedLoansReceivableFairValueDisclosure Impaired loans This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents impaired loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date. Accumulated Net Investment Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity [Member] Represents accumulated net investment gain (loss) on securities transferred from available-for-sale to held-to-maturity. Available for sale securities in a continuous unrealized loss position, unrealized losses Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses Off-Balance Sheet Data Balance Sheet Location [Domain] frbk_CommonEquityTier1DeductionsAndOtherAdjustmentsInitial Common Equity Tier 1, Deductions and Other Adjustments, Initial The percentage of decrease applied to common equity tier 1 for deductions and other adjustments initially recorded. Balance Sheet Location [Axis] frbk_AccruedInterestReceivableAtFairValue Accrued interest receivable The fair value of accrued interest on loans and investments. Scenario, Unspecified [Domain] Time This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes the amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts. Scenario, Forecast [Member] Demand, savings and money market This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure. This item represents the aggregate of all deposits in demand deposits, saving deposits, and money market funds as of the balance sheet date. Fixed Rate SBA Loans [Member] Represents the fixed rate for SBA loans. frbk_AccruedInterestPayableAtFairValue Accrued interest payable The fair value of accrued interest payable. Scenario [Axis] SBA Servicing Asset Adjustable Rate SBA Loans [Member] Represents the adjustable rate for SBA loans. us-gaap_CollateralizedFinancings Collateralized Financings Composition of SBA loans serviced for others Small Business Administration loans presented as a percentage of an entity's total SBA loans. us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Composition of SBA Loans Serviced for Others Impaired Loans [Member] Represents impaired loans. Other Real Estate Owned [Member] Represents other real estate owned. Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value Sales Price Valuation Technique [Member] Represents the sale price valuation technique. frbk_PaymentsForSBALoansOriginatedForSale SBA loans originated for sale Amount of cash outflow for payments for SBA loans originated for sale Proceeds from sales of SBA loans originated for sale Amount of cash inflow for the proceeds from sales of SBA loans originated for sale. Available for sale securities in a continuous unrealized loss position, fair value Income Statement Location [Domain] Income Statement Location [Axis] frbk_GainLossOnSalesOfSbaLoansOriginatedForSale Gains on sales of SBA loans originated for sale Amount of gain (loss) on sales of SBA loans originated for sale. frbk_FairValueMeasurementsSignificantAssumptions1 Unobservable Input Description of significant assumptions used by management to measure fair value. Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] frbk_PaymentsToAcquireBusinessesNet Net cash paid in acquisition The cash outflow associated with the acquisition of business during the period, net of assets aquired. Maximum [Member] Range [Domain] Liquidation expenses Percentage of adjustment to the observed price for a similar asset or liability for estimated liquidation expenses, used as an input to measure fair value. Weighted Average [Member] Minimum [Member] No specific maturity date, available for sale, fair value Range [Axis] After 10 years, available for sale, fair value Due in 1 year or less, available for sale, fair value After 5 years to 10 years, available for sale, fair value After 1 year to 5 years, available for sale, fair value No specific maturity date, available for sale, amortized cost us-gaap_Deposits Total Deposits After 10 years, available for sale, amortized cost After 5 years to 10 years, available for sale, amortized cost After 1 year to 5 years, available for sale, amortized cost Due in 1 year or less, available for sale, amortized cost us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses Available-for-sale Securities, Gross Realized Losses us-gaap_AvailableForSaleSecuritiesGrossRealizedGains Available-for-sale Securities, Gross Realized Gains Certificates of Deposit Time deposits Deferred additional purchase price Amount of deferred additional purchase price in a business combination. frbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansHeldForSale Loans held for sale The amount of loans held for sale recognized as of the acquisition date. Derivative liabilities The amount of derivative liabilities assumed which have been recognized as of the acquisition date. Deposits Derivative assets The amount of derivative assets recognized as of the acquisition date. Additions/adjustments Amount of goodwill and intangible assets acquired during period. Net loss before taxes Income before benefit for income taxes Equity in undistributed income of subsidiaries Equity in undistributed income of subsidiaries Benefit for income taxes Total benefit for income taxes us-gaap_PolicyTextBlockAbstract Accounting Policies Corporate Debt Securities [Member] US States and Political Subdivisions Debt Securities [Member] Impairment charges on investment securities Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Net securities impairment losses recognized in earnings Major Types of Debt and Equity Securities [Domain] Statement [Table] Major Types of Debt and Equity Securities [Axis] us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet Available-for-sale Securities, Gross Realized Gain (Loss) Income Statement [Abstract] Award Type [Axis] Equity Award [Domain] Gain (loss) on sale of investment securities Loss (gain) on sale of investment securities Gain on sales of SBA loans Effect on fair value of a 20% increase us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate Options exercisable (in shares) us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed Effect on fair value of a 20% increase Options outstanding, weighted-average remaining contractual life (Year) Effect on fair value of a 10% increase us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate Options exercisable, weighted-average exercise price (in dollars per share) Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] Total expenses us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed Effect on fair value of a 10% increase Options outstanding, weighted-average exercise price (in dollars per share) Options outstanding (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Upper range limit (in dollars per share) Lower range limit (in dollars per share) Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Taxes, other us-gaap_LiabilityForUncertainTaxPositionsCurrent Liability for Uncertainty in Income Taxes, Current Exercise Price Range [Axis] Financial Standby Letter of Credit [Member] Insurance Dividend yield(1) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Salaries and employee benefits Derivative Asset, Fair Value Collateralized Mortgage Obligations [Member] Derivative Liability, Fair Value Risk-free interest rate(3) Expected volatility(2) Loss Contingency, Nature [Domain] Mortgage-backed Securities, Issued by Private Enterprises [Member] Collateralized Mortgage Backed Securities [Member] Loss Contingency Nature [Axis] Expected life (in years) (4) (Year) Legal Collateralized Debt Obligations [Member] Derivative Contract [Domain] Asset-backed Securities [Member] Derivative Instrument [Axis] Commitments to extend credit Commitments and Contingencies Disclosure [Text Block] us-gaap_GainLossOnSaleOfMortgageLoans Gains on mortgage loans originated for sale us-gaap_MortgageLoansInProcessOfForeclosureAmount Mortgage Loans in Process of Foreclosure, Amount us-gaap_PensionAndOtherPostretirementBenefitExpense Pension and Other Postretirement Benefits Cost (Reversal of Cost) Legal settlements us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value us-gaap_OtherRealEstateDisposals Dispositions Intrinsic value Options exercisable at year-end, weighted average exercise price (in dollars per share) Options exercisable at year-end, shares (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Accrued interest receivable us-gaap_OtherRealEstateValuationAdjustments Valuation adjustments us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Other Real Estate, Roll Forward [Table Text Block] us-gaap_OtherRealEstateAdditions Additions Loans held for sale (includes $43,375 and $23,911 at fair value respectively) Granted, Weighted-Average Grant Date Fair Value (in dollars per share) Forfeited, Weighted-Average Grant Date Fair Value (in dollars per share) Vested, Weighted-Average Grant Date Fair Value (in dollars per share) us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue Nonvested, beginning of year, Weighted-Average Grant Date Fair Value (in dollars per share) Nonvested, end of year, Weighted-Average Grant Date Fair Value (in dollars per share) us-gaap_GoodwillImpairmentLoss Goodwill, Impairment Loss us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares Forfeited, number of shares (in shares) us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions Fair value adjustments Number of unvested stock options (in shares) Nonvested, beginning year, number of shares (in shares) Nonvested, end of year, number of shares (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice Outstanding, beginning of year, weighted average exercise price (in dollars per share) Outstanding, end of year, weighted average exercise price (in dollars per share) us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Vested, number of shares (in shares) frbk_FairValueAdjustmentForMortgageLoansOriginatedForSale Fair value adjustment for mortgage loans originated for sale The amount of fair value adjustment for mortgage loans originated for sale. Forfeited, weighted average exercise price (in dollars per share) Fiscal 2015 [Member] Represents fiscal 2015. Granted, weighted average exercise price (in dollars per share) frbk_ReclassificationOfCertainTaxEffectsFromAccumulatedOtherComprehensiveIncome Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income The amount of reclassification of certain tax effects from accumulated other comprehensive income. Schedule of Servicing Assets at Fair Value [Table Text Block] Depreciation and amortization Fiscal 2016 [Member] Represents fiscal 2016. Exercise, weighted average exercise price (in dollars per share) Amortization of intangible assets Amortization us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding, beginning of year, shares (in shares) Outstanding, end of year, shares (in shares) us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions Additions Professional fees Advertising us-gaap_DefinedContributionPlanCostRecognized Defined Contribution Plan, Cost us-gaap_LoansAndLeasesReceivableRelatedPartiesProceeds Repayments us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans LIABILITIES AND SHAREHOLDERS' EQUITY Total Assets Total Assets Atlantic Community Bankers Bank (ACBB) [Member] Refers to information regarding the Atlantic Community Bankers Bank. Data processing frbk_LoanToValueRatio Loan to Value Ratio The loan to value ratio. Interest income recognized us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch Defined Contribution Plan, Employer Matching Contribution, Percent of Match Occupancy Performance Guarantee Expiring in 2019 [Member] Refers to information regarding the performance guarantee expiring in 2019. Performance Guarantee Expiring in 2018 [Member] Refers to information regarding the performance guarantee expiring in 2018. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Restricted Stock [Policy Text Block] Disclosure of accounting policy for restricted stock. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period frbk_MaximumPercentageOfCapitalPermittedToInvestInTrustPreferredSecurities Maximum Percentage of Capital Permitted to Invest in Trust Preferred Securities The maximum percentage of total capital permitted to be invested in trust preferred securities under adoption of ASC 810 under Federal Reserve final guidance. AltA [Member] A credit rating for mortgages that falls between prime and subprime. Tier one leverage capital to average assets Mortgage Banking Income [Member] Primary financial statement caption encompassing mortgage banking income. Tier one leverage capitalrequired to be well capitalized to average assets Trust Preferred Securities [Policy Text Block] Disclosure of accounting policy related to trust preferred securities. Tier one leverage capital required for capital adequacy to risk average assets Tier One Leverage Capital Required for Capital Adequacy to Average Assets Plan Name [Axis] Capital required to be well capitalized to risk-weighted assets Capital required for capital adequacy to risk-weighted assets Capital Required for Capital Adequacy to Risk Weighted Assets Common equity tier one risk-based capital to risk-weighted assets Plan Name [Domain] Other assets us-gaap_EscrowDeposit Escrow Deposit Statements of Operations Comprehensive Income (Loss) and Changes in Shareholders Equity [Table Text Block] Tabular disclosure of condensed income statement, including, but not limited to, income statements of consolidated entities and consolidation eliminations, comprehensive income and shareholder's equity. Restricted stock, at cost Tier one risk-based capital required to be well capitalized to risk-weighted assets Capital to risk-weighted assets Standby Letters of Credit [Member] InterArch [Member] An entity owned by the spouse of a major shareholder in the company. frbk_MajorShareholderOwnershipPercentage Major Shareholder Ownership Percentage The percentage of ownership of common stock or equity participation in the Company by major shareholder. Tier one risk-based capital required for capital adequacy to risk-weighted assets Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Amount remaining to be recognized as expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Loss before undistributed income of subsidiaries Amount of Income (loss) before undistributed income of subsidiaries. Purchase of Marketing and Graphic Design Services [Member] Represents the amount paid for marketing and graphic design services by the Company to entity owned by spouse of major shareholder in Company. Tier one risk-based capital to risk-weighted assets Site Development [Member] Services related to site development as part of the Company's expansive strategy. Capital SDI Commercial Real Estate LLC [Member] The entity, SDI Commercial Real Estate LLC, a commercial real estate firm. Intangible asset Non-compete agreements Non-compete agreements Tax benefit us-gaap_RestrictedCashAndCashEquivalents Restricted Cash and Cash Equivalents Vernon W Hill [Member] A major shareholder of the Company. Capital required to be well capitalized Glassboro Properties, LLC. [Member] The entity Glassboro Properties, LLC. Capital required for capital adequacy Brian Communications [Member] A related party entity run by a member of the board of directors. Other Real Estate Owned [Text Block] The entire disclosure of other real estate owned. Tier one leverage capitalrequired to be well capitalized Consulting Arrangement [Member] Represents the consulting arrangement the Company has with a major shareholder. Public Relations Services [Member] Amount of transactions with related party during the financial reporting period. Other expenses frbk_ConstructionInProgressLandPurchased Construction in Progress Land Purchased Amount of land purchased for building of store locations. Common equity tier one risk-based capital required to be well capitalized Tier one leverage capital required for capital adequacy Scheduled Maturities of Time Deposits [Table Text Block] Tabular disclosure of maturities of time deposits. Tier one leverage capital Financial Instruments With Off-balance Sheet Risk [Text Block] The entire disclosure of financial instruments with off balance sheet risk. frbk_NumberOfSpecificStoreLocations Number of Specific Store Locations Number of specific store locations related to land purchases. Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Common equity tier one risk-based capital required for capital adequacy frbk_CostOfCompletion Cost of Completion Costs to complete projects in process. Statement of Comprehensive Income [Abstract] Common equity tier one risk-based capital Overnight Advances [Member] Overnight advances made to the Company by FHLB or correspondent banks with a fixed term. Tier one risk-based capital Tier one risk based capital Tier one risk-based capital required to be well capitalized Tier one risk-based capital required for capital adequacy frbk_DeferredTaxAssetsTemporaryTimingDifferences Deferred Tax Assets, Temporary Timing Differences Amount of deferred tax assets on items associated with temporary timing differences which will reverse at some point in the future. Interest expense Total interest expense Foreclosed real estate write-downs Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from foreclosed real estate write-down. frbk_NetDeferredTaxAssetBeforeValuationAllowance Net Deferred Tax Asset Before Valuation Allowance Net deferred tax asset before valuation allowance Amount of deferred tax assets after subtracting gross deferred tax liabilities. us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities Correspondent Bank [Member] Banking entity providing financial support to allow Company to purchase federal funds. Amortization of debt issuance costs Amortization of Debt Issuance Costs Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Goodwill Goodwill Goodwill Goodwill Regulatory Capital Requirements under Banking Regulations [Text Block] Trust preferred interest expense Premises and equipment, net Net premises and equipment Republic Capital Trust II [Member] The entity of Republic Capital Trust II. us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Less accumulated depreciation Premises and equipment Property, Plant and Equipment, Gross us-gaap_InterestExpenseBorrowings Other borrowings frbk_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueAggregate Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value, Aggregate The aggregate weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. frbk_FairValueAssumptionsExpectedVolatilityRateTermCalculation Fair Value Assumptions, Expected Volatility Rate, Term Calculation The expected volatility is based on Bloomberg’s five and one-half to seven year volatility calculation for “FRBK” stock. Restricted stock frbk_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateTermCalculation Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Term Calculation The risk-free interest rate is based on the five to seven year Treasury bond. Common equity tier one risk-based capital required for capital adequacy to risk-weighted assets Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets The minimum Common Equity Tier One Capital Ratio (Common Equity Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. Common equity tier one risk-based capital required to be well capitalized to risk-weighted assets The Common Equity Tier 1 capital ratio (Common Equity Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. us-gaap_TableTextBlock Notes Tables frbk_CapitalConservationBuffer Capital Conservation Buffer A mandatory minimum capital requirement equivalent to 2.5% of risk-weighted assets above the minimum risk-based capital requirements. CET 1 risk based capital Tier one leveraged capital Total risk based capital Range 1 [Member] Range 1 in a series of ranges. Schedule of Share-based Compensation, Options, Exercises [Table Text Block] Tabular disclosure of stock option exercises. Range 4 [Member] Range 4 in a series of ranges. us-gaap_InterestExpenseTimeDeposits Time deposits Derivative asset Derivative Asset Range 2 [Member] Range 2 in a series of ranges. Range 3 [Member] Range 3 in a series of ranges.