Document And Entity Information Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate After 10 years, available for sale, fair value Note To Financial Statement Details Textual us-gaap_DerivativeGainLossOnDerivativeNet Derivative Gain (Loss), Net Asset Derivatives [Member] Information pertaining to asset derivatives. Significant Accounting Policies Note 2 - Summary of Significant Accounting Policies Due in 1 year or less, available for sale, amortized cost Mortgage-backed Securities, Issued by Private Enterprises [Member] Note 5 - Investment Securities Risk-free interest rate Collateralized Mortgage Obligations [Member] Note 6 - Loans Receivable and Allowance for Loan Losses Due in 1 year or less, available for sale, fair value Note 7 - Fair Value of Financial Instruments After 1 year to 5 years, available for sale, fair value Liability Derivatives [Member] Information pertaining to liability derivatives. Note 8 - Changes in Accumulated Other Comprehensive Income (Loss) By Component (1) After 5 years to 10 years, available for sale, fair value Collateralized Mortgage Backed Securities [Member] Note 9 - Goodwill and Other Intangibles Not Designated as Hedging Instrument [Member] Note 10 - Derivatives and Risk Management Activities Note 11 - Revenue Recognition Unrealized gain (loss) on securities Net unrealized gains/(losses) on securities Note 12 - Leases Note 2 - Summary of Significant Accounting Policies - Valuation Assumptions (Details) Collateralized Debt Obligations [Member] Unrealized gains (losses) on securities (pre-tax $2,473, ($2,300), $4,775, and ($9,008), respectively) Hedging Designation [Axis] Note 2 - Summary of Significant Accounting Policies - Stock-based Compensation (Details) Hedging Designation [Domain] Expected volatility Note 2 - Summary of Significant Accounting Policies - Calculation of EPS (Details) Designated as Hedging Instrument [Member] us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax Reclassification adjustment for securities (gains) losses (pre-tax ($261), $1, ($583), and $1, respectively) Note 2 - Summary of Significant Accounting Policies - Anti-dilutive Securities (Details) Stock held by deferred compensation plan (in shares) The number of shares of the entity's stock held in deferred compensation plan for payment of future benefits. Note 5 - Investment Securities - Unrealized Gain (Loss) on Investments (Details) Note 5 - Investment Securities - Investment Securities by Contractual Maturity (Details) Note 5 - Investment Securities - Credit-related Impairment Losses on Securities (Details) Expected life(4) (in years) (Year) Asset-backed Securities [Member] Note 5 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) Note 6 - Loans Receivable and Allowance for Loan Losses - Gross Loans by Major Category (Details) Note 6 - Loans Receivable and Allowance for Loan Losses - Activity in Allowance for Loan Losses (Details) Note 6 - Loans Receivable and Allowance for Loan Losses - Impaired Loans (Details) Note 6 - Loans Receivable and Allowance for Loan Losses - Impaired Loans, Additional Information (Details) US States and Political Subdivisions Debt Securities [Member] Accrued interest receivable Note 6 - Loans Receivable and Allowance for Loan Losses - Past Due Loans (Details) Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Note 6 - Loans Receivable and Allowance for Loan Losses - Loans by Internal Risk Rating (Details) Note 6 - Loans Receivable and Allowance for Loan Losses - Non-accrual Loans (Details) Note 6 - Loan Receivables and Allowance for Loan Losses - Troubled Debt Restructurings (Details) Mortgage loans held for sale, at fair value Note 7 - Fair Value of Financial Instruments - Financial Assets Measured at on a Recurring Basis (Details) Note 7 - Fair Value of Financial Instruments - SBA Servicing Assets Activity (Details) Note 7 - Fair Value of Financial Instruments - Assets Measured on a Recurring Basis Using Significant Unobservable Inputs (Details) Share-based Payment Arrangement, Activity [Table Text Block] Note 7 - Fair Value of Financial Instruments - Assets Measured on a Nonrecurring Basis (Details) Proceeds from the maturity or call of securities held to maturity Pass [Member] Note 7 - Fair Value of Financial Instruments - Quantitative Information about Level 3 Assets (Details) us-gaap_DerivativeNumberOfInstrumentsHeld Derivative, Number of Instruments Held, Total Note 7 - Fair Value of Financial Instruments - Mortgage Loans Held for Sale (Details) Subprime [Member] Note 7 - Fair Value of Financial Instruments - SBA Servicing Assets Sensitivity Analysis (Details) Note 7 - Fair Value of Financial Instruments - Fair Values of Financial Instruments (Details) Agency Mortgage-backed Securities [Member] Information pertaining to agency mortgage-backed securities. Note 8 - Changes in Accumulated Other Comprehensive Income (Loss) By Component (1) - Accumulated Other Comprehensive Loss (Details) Note 9 - Goodwill and Other Intangibles - Summary of Goodwill and Other Intangibles (Details) Note 10 - Derivatives and Risk Management Activities - Amounts Recorded in Statement of Financial Condition (Details) Note 10 - Derivatives and Risk Management Activities - Derivative Instrument Gain (Loss) Recorded in Statement of Income (Details) Note 11 - Revenue Recognition - Non-interest Income Segregated by Revenue Streams (Details) Internal Credit Assessment [Axis] US Government Agencies Debt Securities [Member] Note 12 - Leases - Operating Lease Costs (Details) Internal Credit Assessment [Domain] Proceeds from the maturity or call of securities available for sale Note 12 - Leases - Maturity Analysis of Operating Lease Liability Obligations (Details) Corporate Debt Securities [Member] Notes To Financial Statements Notes To Financial Statements [Abstract] us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax Amounts reclassified from accumulated other comprehensive income to net income (2) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares us-gaap_PaymentsToAcquireHeldToMaturitySecurities Purchase of investment securities held to maturity Number of unvested stock options (in shares) Financial Instruments [Domain] Financial Instrument [Axis] Goodwill and Intangible Assets Disclosure [Text Block] Interest income recognized us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans us-gaap_DerivativeAssetNotionalAmount Derivative Asset, Notional Amount No specific maturity date, available for sale, fair value us-gaap_DerivativeLiabilityNotionalAmount Derivative Liability, Notional Amount Lessee, Operating Leases [Text Block] No specific maturity date, available for sale, amortized cost us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance us-gaap_PolicyTextBlockAbstract Accounting Policies Special Mention [Member] Substandard [Member] us-gaap_DebtSecuritiesAvailableForSaleRealizedGain Debt Securities, Available-for-sale, Realized Gain Doubtful [Member] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss Debt Securities, Available-for-sale, Realized Loss us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Premises and equipment expenditures Non-monetary transfers from loans to other real estate owned us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Allowance for Credit Losses [Text Block] Measurement Input, Liquidation Expenses [Member] Measurement input using the value of liquidation expenses. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Troubled debt restructurings LIABILITIES AND SHAREHOLDERS' EQUITY us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts us-gaap_Assets Total Assets Supplemental disclosures Impaired Financing Receivables, Average Recorded Investment and Interest Income, Accrual Method [Table Text Block] Tabular disclosure of impaired financing receivables. Includes (1) the average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses; (2) the amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. Plan Name [Axis] Plan Name [Domain] us-gaap_FinancingReceivableModificationsNumberOfContracts2 Financing Receivable, Modifications, Number of Contracts Amount remaining to be recognized as expense Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount us-gaap_SubleaseIncome Sublease income Impaired Financing Receivables [Table Text Block] Financing Receivable, Troubled Debt Restructuring [Table Text Block] Legal Matters and Contingencies [Text Block] us-gaap_CapitalizedContractCostNet Capitalized Contract Cost, Net, Total Other assets Restricted stock, at cost Net income (basic and diluted) Net income Net income Loans receivable greater than 90 days and accruing Financing Receivable Credit Quality Indicators [Table Text Block] Loans receivable, current Loans receivable, total past due Share-based Payment Arrangement, Option [Member] Non-accrual loans Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Financial Asset, 30 to 59 Days Past Due [Member] Financial Asset, 60 to 89 Days Past Due [Member] Antidilutive Securities [Axis] Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Antidilutive Securities, Name [Domain] Financing Receivable, Past Due [Table Text Block] Additions/Adjustments Financial Asset, Period Past Due [Axis] Financial Asset, Period Past Due [Domain] Net proceeds from sale of other real estate owned Effect on fair value of a 20% increase us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate Premises and equipment, net Goodwill Balance Balance us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed Effect on fair value of a 20% increase Commitments to extend credit Effect on fair value of a 10% increase us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed Effect on fair value of a 10% increase us-gaap_DerivativeFairValueOfDerivativeLiability Derivative Liability, Fair Value us-gaap_DerivativeFairValueOfDerivativeAsset Derivative Asset, Fair Value Derivative asset Derivative Asset us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock Net redemption (purchase) of restricted stock Loan and Servicing Fees [Member] Represents fees relating to loans and servicing of loans. Derivative Instrument [Axis] Derivative Contract [Domain] Cash flows from investing activities Investment securities available for sale, at fair value Total, available for sale, fair value Total, held to maturity, amortized cost Investment securities held to maturity, at amortized cost (fair value of $725,796 and $747,323, respectively) Investment securities held to maturity, at amortized cost Net income per share: Interest and Fees [Member] Represents information pertaining to the income statement line item, Interest and Fees. us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments Income before provision for income taxes Decrease in accrued interest payable and other liabilities Provision for income taxes us-gaap_MortgageLoansInProcessOfForeclosureAmount Mortgage Loans in Process of Foreclosure, Amount Other real estate owned, net Real Estate Acquired Through Foreclosure 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). Interest and fees on taxable loans The amount of operating interest income, including amortization and accretion of premiums and discounts, on loans subject to state, federal and other income tax. us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax, Total us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld Balance Balance Interest and fees on tax-exempt loans The amount of operating interest income, including amortization and accretion of premiums and discounts, on loans exempt from state, federal and other income tax. 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 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 Option, Disclosures [Table Text Block] After 5 years to 10 years, held to maturity, amortized cost Mandatory Forward Loan Sales Commitments [Member] Represents information pertaining to mandatory forward loan sales commitments. After 10 years, held to maturity, amortized cost Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block] us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions Fair value adjustments Best Efforts Forward Loan sales Commitments [Member] Represents information pertaining to best efforts forward loan sales commitments. Taxes, other Due in 1 year or less, held to maturity, amortized cost Insurance After 1 year to 5 years, held to maturity, amortized cost Interest bearing deposits with banks Due in 1 year or less, held to maturity, fair value After 1 year to 5 years, held to maturity, fair value After 5 years to 10 years, held to maturity, fair value After 10 years, held to maturity, fair value us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss Investment securities held to maturity, gross unrealized losses Unrealized gains (losses) Investment securities held to maturity, gross unrealized gains Salaries and employee benefits Schedule of Servicing Assets at Fair Value [Table Text Block] Cash and due from banks Aggregate Unpaid Principal Balance Amount of unpaid principal balance of mortgage loans held for sale. Stock based compensation expense recognized Realized losses Excess Carrying Amount Over Aggregate Unpaid Principal Balance The amount of mortgage loans held for sale in excess of the unpaid principal balance. 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. Loans evaluated individually Legal Amortization of net unrealized holding losses to income during the period (pre-tax $332, $30, $644, and $69 respectively) The amount of expense charged against earnings by an entity to record the amortization of gains and losses on securities net of tax. Loans evaluated collectively Write down of other real estate owned Amount of other real estate owned that have been written off. Allowance for loan losses, individually evaluated for impairment Allowance for loan losses, collectively evaluated for impairment Amendment Flag 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. Recoveries Other comprehensive income (loss), net of tax us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs Charge-offs Automated teller machine expenses The amount of ATM expenses. us-gaap_ComprehensiveIncomeNetOfTax Total comprehensive income (loss) 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. frbk_NumberOfWhollyOwnedSubsidiary Number of Wholly Owned Subsidiary Number of wholly owned subsidiary of the entity. Use of Estimates, Policy [Policy Text Block] 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. New Accounting Pronouncements, Policy [Policy Text Block] frbk_NumberOfTrustPreferredSecuritiesIssued Number of Trust Preferred Securities Issued Number of trust preferred securities issued by the entity. 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. frbk_NumberOfUnconsolidatedSubsidiaries Number of Unconsolidated Subsidiaries Number of unconsolidated subsidiaries of the entity. The 2005 Plan [Member] The reporting entity's Stock Option and Restricted Stock Plan or the 2015 Plan. Restricted stock 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, shares outstanding (in shares) Preferred stock, shares outstanding (in shares) frbk_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueAmount Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value, Amount Amount of the weighted average grant-date fair value of options granted during the period. Financing Receivable, Allowance for Credit Loss [Table Text Block] 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. Held to maturity securities in a continuous unrealized loss position, fair value Gain on sales of SBA loans frbk_TreasuryBondTermOnWhichRiskFreeInterestRateIsBased Treasury Bond Term On Which Risk Free Interest Rate is Based Refers to treasury bond term on which risk free interest rate is based. Current Fiscal Year End Date frbk_ChangeInAccumulatedOtherComprehensiveIncomeLossIncludingEffectsResultingFromAdoptionOfAsu201802 Total change in accumulated other comprehensive income Amount increase (decrease) to accumulated other comprehensive income (loss), including effects resulting from the adoption of ASU 2018-02. us-gaap_LeaseCost Total lease cost frbk_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOptionsForfeitedWeightedAverageGrantDateFairValueAmount Share-based Compensation Arrangement by Share-based Payment Award, Options, Options Forfeited, Weighted Average Grant Date Fair Value, Amount Amount of weighted average grant-date fair value of options forfeited during the period. Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value us-gaap_GainLossOnSaleOfMortgageLoans Gains on mortgage loans originated for sale Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss Debt Securities, Available-for-sale, Realized Gain (Loss), Total us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent Operating Lease, Weighted Average Discount Rate, Percent Document Fiscal Period Focus Operating lease cost Document Fiscal Year Focus 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. Lease, Cost [Table Text Block] Document Period End Date us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1 Operating Lease, Weighted Average Remaining Lease Term Assumed forfeiture rate The estimated forfeiture rate of the underlying shares over the option's term. Fair value of unvested stock options Represents the fair value of unvested stock options. Entity Emerging Growth Company No specific maturity date, held to maturity, fair value Document Type Entity Small Business Entity Shell Company frbk_NumberOfSecuritiesInInvestmentPortfolio Number of Securities in Investment Portfolio Refers to number of securities included in investment portfolio. Document Information [Line Items] Document Information [Table] No specific maturity date, held to maturity, amortized cost Other loans held for sale Represents other loans held for sale. Entity Filer Category Entity Current Reporting Status 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. us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet Increase in accrued interest receivable and other assets Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 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. Held to maturity securities in a continuous unrealized loss position, unrealized losses Contract Acquisition Costs [Member] Represents contract acquisition costs. us-gaap_GoodwillImpairmentLoss Goodwill, Impairment Loss Other Non-interest Income From Customers [Member] Non interest income derived from contracts with customers which is within the scope of ASC 606. Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses Fair Value of SBA Servicing Asset SBA Servicing Assets Balance Balance Stock based compensation Statement of Comprehensive Income [Abstract] us-gaap_ServicingAsset Servicing Asset, Total Entity Central Index Key Capitalized Contract Cost [Axis] Depreciation and amortization Entity Registrant Name Capitalized Contract Cost [Domain] Liability Class [Axis] Fair Value by Liability Class [Domain] Entity [Domain] Legal Entity [Axis] Non-interest income (out-of-scope of Topic 606) Represents portion of non-interest income that is not within the scope of ASC 606. us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue Balance Balance us-gaap_FinancingReceivableAllowanceForCreditLosses Total allowance for loan losses Beginning balance Ending balance us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales Proceeds from sales us-gaap_OtherRealEstateAndForeclosedAssets Other real estate owned us-gaap_TreasuryStockValue Treasury stock at cost (503,408 shares as of June 30, 2019 and December 31, 2018) us-gaap_IncreaseDecreaseInNotesReceivables Net increase in loans Entity Common Stock, Shares Outstanding (in shares) Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Advertising Loans receivable (net of allowance for loan losses of $8,056 and $8,615, respectively) Net loans receivable Loans receivable Total loans receivable Professional fees us-gaap_LoansAndLeasesReceivableDeferredIncome Deferred costs (fees) us-gaap_LoansAndLeasesReceivableAllowance Allowance for loan losses Trading Symbol Data processing Conversion of subordinated debt to common stock us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments Occupancy Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Conversion of subordinated debt, shares (in shares) Options exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period us-gaap_TableTextBlock Notes Tables us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale Mortgage loans originated for sale Options exercised Proceeds from sales of mortgage loans originated for sale Gain (loss) on sale of investment securities Net (gain) loss on sale of investment securities SBA servicing assets, unobservable input us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Other real estate owned, measurement input Investment securities held to maturity, at fair value Total, held to maturity, fair value us-gaap_LiabilitiesAndStockholdersEquity Total Liabilities and Shareholders’ Equity Reported Value Measurement [Member] us-gaap_CashCashEquivalentsAndFederalFundsSold Cash and cash equivalents Cash and cash equivalents, beginning of year Cash and cash equivalents, end of period 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. Accumulated deficit Impaired loans, unobservable input Value of input used to measure impaired loans. Accumulated other comprehensive loss Measurement Input, Prepayment Rate [Member] Measurement Input, Discount Rate [Member] us-gaap_InterestExpense Total interest expense Amortization of debt issuance costs us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Derivative Instruments and Hedging Activities Disclosure [Text Block] us-gaap_InterestExpenseBorrowings Other borrowings Operating lease liability Operating Lease, Liability, Total Securities, unobservable input Operating lease right-of-use asset Operating Lease, Right-of-Use Asset us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total undiscounted cash flows us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Discount on cash flows Measurement Input Type [Axis] Measurement Input Type [Domain] More than five years Valuation Technique, Discounted Cash Flow [Member] Operating lease payments due: Valuation, Market Approach [Member] us-gaap_InterestExpenseTimeDeposits Time deposits Valuation Approach and Technique [Axis] Valuation Approach and Technique [Domain] us-gaap_InterestExpenseNegotiableOrderOfWithdrawalNOWDeposits Demand- interest bearing Lessee, Operating Lease, Liability, Maturity [Table Text Block] us-gaap_ShareBasedCompensation Stock based compensation Conversion of subordinated debt to common stock Within one year Earnings Per Share, Policy [Policy Text Block] Interest expense: us-gaap_DepreciationAmortizationAndAccretionNet Depreciation and amortization Fair Value us-gaap_InterestAndDividendIncomeOperating Total interest income us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments Amortization of premiums on investment securities us-gaap_LesseeOperatingLeaseRenewalTerm Lessee, Operating Lease, Renewal Term Interest on federal funds sold and other interest-earning assets Carrying Amount Mortgages Held-for-sale, Fair Value Disclosure Loans held for sale us-gaap_LoansHeldForSaleFairValueDisclosure Standby letters-of-credit Cash and cash equivalents Share-based Payment Arrangement [Policy Text Block] us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations Subordinated debt Interest and dividends on taxable investment securities Interest and dividends on tax-exempt investment securities Treasury stock (in shares) Fair Value, Nonrecurring [Member] Number of Loans Cumulative number of financing receivables that have been modified by troubled debt restructurings. Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Common stock, par value $0.01 per share: 100,000,000 shares authorized; shares issued 59,371,623 as of June 30, 2019 and 59,318,073 as of December 31, 2018; shares outstanding 58,842,778 as of June 30, 2019 and 58,789,228 as of December 31, 2018 Troubled debt restructurings, accrual status Recorded investment in financing receivables that have undergone troubled debt restructuring and are accruing. Troubled debt restructurings, non-accrual status Recorded investment in financing receivables that have undergone troubled debt restructuring and are not accruing. Adjustments to reconcile net income to net cash provided by operating activities: Measurement Frequency [Axis] Measurement Frequency [Domain] us-gaap_ServicingAssetAtFairValueAdditions Additions Fair Value, Recurring [Member] Common stock, shares authorized (in shares) Common stock, shares issued (in shares) Common stock, par value (in dollars per share) 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_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. SBA Servicing Assets [Member] Represents SBA servicing assets. Demand - non-interest bearing Statistical Measurement [Domain] Operating cash flows from operating leases Maximum [Member] Minimum [Member] 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. Weighted Average [Member] Product and Service [Axis] Product and Service [Domain] 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. Statistical Measurement [Axis] us-gaap_InterestAndFeeIncomeLoansHeldForSaleMortgages Interest and Fee Income, Loans Held-for-sale, Mortgages Preferred stock, par value $0.01 per share: 10,000,000 shares authorized; no shares issued and outstanding Prepayment Speed Preferred stock, shares issued (in shares) Weighted Average Remaining Term (in years) (Year) Interest paid Off-Balance Sheet Data Preferred stock, shares authorized (in shares) Weighted Average Discount Rate frbk_AccruedInterestReceivableAtFairValue Accrued interest receivable The fair value of accrued interest on loans and investments. Demand - interest bearing Portion at Fair Value Measurement [Member] [Default] 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. Preferred stock par value (in dollars per share) Estimate of Fair Value Measurement [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. Other non-interest income Fixed Rate SBA Loans [Member] Represents the fixed rate for SBA loans. Total non-interest income frbk_AccruedInterestPayableAtFairValue Accrued interest payable The fair value of accrued interest payable. Non-interest income SBA Servicing Asset Adjustable Rate SBA Loans [Member] Represents the adjustable rate for SBA loans. Measurement Basis [Axis] Composition of SBA loans serviced for others Small Business Administration loans presented as a percentage of an entity's total SBA loans. Fair Value, Inputs, Level 3 [Member] Composition of SBA Loans Serviced for Others Impaired Loans [Member] Represents impaired loans. Fair Value Hierarchy and NAV [Domain] Other Real Estate Owned [Member] Represents other real estate owned. Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Non-interest income: Fair Value Hierarchy and NAV [Axis] Net unrealized holding losses on securities transferred from available-for-sale to held-to-maturity Amount after tax and reclassification adjustments, of appreciation (loss) in value of available-for-sale securities transferred to held-to-maturity, attributable to parent entity. 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 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss Net interest income after provision for loan losses Proceeds from sales of SBA loans originated for sale Amount of cash inflow for the proceeds from sales of SBA loans originated for sale. frbk_GainLossOnSalesOfSbaLoansOriginatedForSale Gains on sales of SBA loans originated for sale Amount of gain (loss) on sales of SBA loans originated for sale. Provision for loan losses us-gaap_InterestIncomeExpenseNet Net interest income Cash flows from operating activities Non-cash expense related to leases Amount of net increase (decrease) in right-of-use assets and operating lease liabilities during the period. Statement [Line Items] us-gaap_NumberOfReportableSegments Number of Reportable Segments Additional paid in capital AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] us-gaap_DeferredCompensationEquity Stock held by deferred compensation plan (25,437 shares as of June 30, 2019 and December 31, 2018) frbk_LesseeFinanceLeaseNumberOfLeases Lessee, Finance Lease, Number of Leases Number of lessee's finance leases. frbk_LesseeOperatingLeaseNumberOfLeases Lessee, Operating Lease, Number of Leases Number of lessee's operating leases. AOCI Attributable to Parent [Member] Shareholders’ Equity Three to five years Amount of lessee's undiscounted obligation for lease payments for operating lease, due in three to five years. Financial liabilities: One to three years Amount of lessee's undiscounted obligation for lease payments for operating lease, due in one to three years. Loans receivable, net Segment Reporting Disclosure [Text Block] Deposit Account [Member] Mortgage Banking [Member] Financial assets: Fair Value Disclosures [Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] ASSETS us-gaap_Liabilities Total Liabilities us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by financing activities us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Other liabilities us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease Net increase (decrease) in cash and cash equivalents Derivatives, Policy [Policy Text Block] Derivative liability Derivative Liability Accounting Standards Update 2016-02 [Member] Accrued interest payable Type of Adoption [Domain] Related allowance Adjustments for New Accounting Pronouncements [Axis] With no related allowance recorded - Interest income recognized With related allowance - Interest income recognized With no related allowance - Recorded investment Interest income: With related allowance - Recorded investment Recorded investment With no related allowance recorded - Average recorded investment With related allowance - Average recorded investment Average recorded investment With no related allowance - Unpaid principal balance With related allowance - Unpaid principal balance Unpaid principal balance Other operating expenses us-gaap_NoninterestExpense Total non-interest expense Regulatory assessments and costs Appraisal and other loan expenses Retained Earnings [Member] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Other real estate owned Appraised Value of Collateral [Member] Valuation technique using the appraised value of collateral. Deferred Compensation, Share-based Payments [Member] Treasury Stock [Member] Non-interest expenses: Additional Paid-in Capital [Member] Common Stock [Member] Equity Components [Axis] Equity Component [Domain] Other Liabilities [Member] Unallocated Financing Receivables [Member] Commercial Real Estate Portfolio Segment [Member] Other Assets [Member] Financing Receivable Portfolio Segment [Domain] Commercial Portfolio Segment [Member] Residential Portfolio Segment [Member] Consumer Portfolio Segment [Member] Financing Receivable Portfolio Segment [Axis] Comprehensive Income (Loss) Note [Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Mortgage Banking Activity [Policy Text Block] Subordinated debt Disaggregation of Revenue [Table Text Block] Revenue from Contract with Customer [Text Block] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Short-term borrowings New operating lease liability obligation Present value of lessee's discounted obligation for lease payments from operating lease, included in operating cash flows. Title of 12(b) Security Income Statement Location [Axis] Income Statement Location [Domain] Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Net (repayment) increase in short-term borrowings frbk_FairValueAdjustmentForMortgageLoansOriginatedForSale Fair value adjustment for mortgage loans originated for sale The amount of fair value adjustment for mortgage loans originated for sale. us-gaap_PaymentsToAcquireAvailableForSaleSecurities Purchase of investment securities available for sale Weighted average shares outstanding (in shares) us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted Proceeds from the sale of securities available for sale Proceeds from Sale of Available-for-sale Securities, Total Investment securities held to maturity Represents the disclosure of fair value value for securities held to maturity. Reclassification due to the adoption of ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income The amount of reclassification of certain tax effects from accumulated other comprehensive income. Anti-dilutive securities (in shares) Weighted average shares outstanding (including dilutive CSEs) (in shares) us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Asset Class [Axis] Asset Class [Domain] Statement [Table] Statement of Financial Position [Abstract] Net income per share – diluted (in dollars per share) Diluted (in dollars per share) Net income per share – basic (in dollars per share) Basic (in dollars per share) Statement of Cash Flows [Abstract] Statement of Stockholders' Equity [Abstract] Income Statement [Abstract] Other comprehensive income, net of tax Total other comprehensive income (loss) Financing Receivable, Nonaccrual [Table Text Block] Available for sale securities in a continuous unrealized loss position, unrealized losses us-gaap_Deposits Total Deposits us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total 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 AltA [Member] A credit rating for mortgages that falls between prime and subprime. Investments Classified by Contractual Maturity Date [Table Text Block] Mortgage Banking Income [Member] Primary financial statement caption encompassing mortgage banking income. frbk_SharebasedCompensationArrangementBySharebasedPaymentAwardPeriodForDeterminingForfeitureRate Share-based Compensation Arrangement by Share-based Payment Award, Period for Determining Forfeiture Rate The period used for determining the forfeiture rate for share based compensation awards. Unrealized Gain (Loss) on Investments [Table Text Block] Schedule of Intangible Assets and Goodwill [Table Text Block] Time deposits Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] 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, fair value us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax Reclassification adjustment for securities losses (gains), pre-tax Increase in time deposits us-gaap_ContractuallySpecifiedServicingFeesAmount Contractually Specified Servicing Fees, Amount Fair Value Measurements, Nonrecurring [Table Text Block] Increase in demand, money market and savings deposits Unrealized gains (losses) on securities, pre-tax Cash flows from financing activities Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Interest Rate Lock Commitments [Member] us-gaap_StockholdersEquity Total Shareholders’ Equity Balance Balance Class of Stock [Axis] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax Investment securities available for sale, gross unrealized losses Investment securities available for sale, gross unrealized gains Investment securities available for sale, at amortized cost us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis Total, available for sale, amortized cost After 1 year to 5 years, available for sale, amortized cost After 5 years to 10 years, available for sale, amortized cost After 10 years, available for sale, amortized cost