Note 7 - Fair Value of Financial Instruments (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Servicing Fees	$ 433,000	$ 434,000
Loans Held-for-sale, Write-down	$ 0		$ 0
SBA Servicing Assets [Member]
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Key Assumptions, Percent	10.00%		10.00%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Key Assumptions	20.00%		20.00%
Interest and Fees [Member]
Interest and Fee Income, Loans Held-for-sale, Mortgages	$ 129,000	$ 0

The amount of write-down on loans held-for-sale during the period.

No definition available.

Name:	frbk_LoansHeldforsaleWritedown
Namespace Prefix:	frbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

Name:	frbk_SensitivityAnalysisOfFairValueTransferorsInterestsInTransferredFinancialAssetsImpactOf10PercentAdverseChangeInKeyAssumptionsPercent
Namespace Prefix:	frbk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

Name:	frbk_SensitivityAnalysisOfFairValueTransferorsInterestsInTransferredFinancialAssetsImpactOf20PercentAdverseChangeInKeyAssumptions
Namespace Prefix:	frbk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest and fee income from mortgage loans considered to be held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

Name:	us-gaap_InterestAndFeeIncomeLoansHeldForSaleMortgages
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of fees from providing shareholder services, including, but not limited to, answering shareholder inquiries and providing shareholders with information about their investments.

+ References

No definition available.

+ Details

Name:	us-gaap_ServicingFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_FinancialInstrumentAxis=frbk_SBAServicingAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=frbk_InterestAndFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: