Note 6 - Loans Receivable and Allowances for Loan Losses (Details) - Troubled Debt Restructurings $ in Thousands	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Financing Receivable, Modifications [Line Items]
Number of loans	4	4
Troubled debt restructurings, accrual status	$ 6,001	$ 6,030
Troubled debt restructurings, non-accrual status	2,174	2,760
Troubled debt restructurings	$ 8,175	$ 8,790
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	1	1
Troubled debt restructurings, accrual status	$ 5,751	$ 5,778
Troubled debt restructurings, non-accrual status	0	0
Troubled debt restructurings	$ 5,751	$ 5,778
Construction and Land Development Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	0	0
Troubled debt restructurings, accrual status	$ 0	$ 0
Troubled debt restructurings, non-accrual status	0	0
Troubled debt restructurings	$ 0	$ 0
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	2	2
Troubled debt restructurings, accrual status	$ 250	$ 252
Troubled debt restructurings, non-accrual status	349	935
Troubled debt restructurings	$ 599	$ 1,187
Owner Occupied Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	1	1
Troubled debt restructurings, accrual status	$ 0	$ 0
Troubled debt restructurings, non-accrual status	1,825	1,825
Troubled debt restructurings	$ 1,825	$ 1,825
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	0	0
Troubled debt restructurings, accrual status	$ 0	$ 0
Troubled debt restructurings, non-accrual status	0	0
Troubled debt restructurings	$ 0	$ 0
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of loans	0	0
Troubled debt restructurings, accrual status	$ 0	$ 0
Troubled debt restructurings, non-accrual status	0	0
Troubled debt restructurings	$ 0	$ 0

Cumulative number of financing receivables that have been modified by troubled debt restructurings.

No definition available.

Name:	frbk_FinancingReceivableModificationsCumulativeNumberOfContracts
Namespace Prefix:	frbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Recorded investment in financing receivables that have undergone troubled debt restructuring and are accruing.

+ References

No definition available.

+ Details

Name:	frbk_TroubledDebtRestructuredFinancingReceivableRecordedInvestmentAndAccruing
Namespace Prefix:	frbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Recorded investment in financing receivables that have undergone troubled debt restructuring and are not accruing.

+ References

No definition available.

+ Details

Name:	frbk_TroubledDebtRestructuredFinancingReceivableRecordedInvestmentAndNotAccruing
Namespace Prefix:	frbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

+ Details

Name:	us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=frbk_ConstructionAndLandDevelopmentPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=frbk_OwnerOccupiedRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: