Note 7 - Loans Receivable and Allowance for Credit Losses - Impaired Loans (Details) $ in Thousands	Dec. 31, 2021 USD ($)
With no related allowance - Recorded investment	$ 4,415
With no related allowance - Unpaid principal balance	5,042
With an related allowance - Recorded investment	14,005
With related allowance - Unpaid principal balance	14,684
Related allowance	2,743
Commercial real estate	18,420
Unpaid principal balance	19,726
Commercial Real Estate Portfolio Segment [Member]
With no related allowance - Recorded investment	479
With no related allowance - Unpaid principal balance	691
With an related allowance - Recorded investment	4,014
With related allowance - Unpaid principal balance	4,536
Related allowance	992
Commercial real estate	4,493
Unpaid principal balance	5,227
Construction and Land Development Portfolio Segment [Member]
With no related allowance - Recorded investment	0
With no related allowance - Unpaid principal balance	0
With an related allowance - Recorded investment	0
With related allowance - Unpaid principal balance	0
Related allowance	0
Commercial real estate	0
Unpaid principal balance	0
Commercial Portfolio Segment [Member]
With no related allowance - Recorded investment	80
With no related allowance - Unpaid principal balance	81
With an related allowance - Recorded investment	2,478
With related allowance - Unpaid principal balance	2,616
Related allowance	1,169
Commercial real estate	2,558
Unpaid principal balance	2,697
Owner Occupied Real Estate [Member]
With no related allowance - Recorded investment	2,080
With no related allowance - Unpaid principal balance	2,080
With an related allowance - Recorded investment	7,513
With related allowance - Unpaid principal balance	7,532
Related allowance	582
Commercial real estate	9,593
Unpaid principal balance	9,612
Consumer Portfolio Segment [Member]
With no related allowance - Recorded investment	1,075
With no related allowance - Unpaid principal balance	1,422
With an related allowance - Recorded investment	0
With related allowance - Unpaid principal balance	0
Related allowance	0
Commercial real estate	1,075
Unpaid principal balance	1,422
Residential Portfolio Segment [Member]
With no related allowance - Recorded investment	701
With no related allowance - Unpaid principal balance	768
With an related allowance - Recorded investment	0
With related allowance - Unpaid principal balance	0
Related allowance	0
Commercial real estate	701
Unpaid principal balance	768
Paycheck Protection Program CARES Act [Member]
With no related allowance - Recorded investment	0
With no related allowance - Unpaid principal balance	0
With an related allowance - Recorded investment	0
With related allowance - Unpaid principal balance	0
Related allowance	0
Commercial real estate	0
Unpaid principal balance	$ 0

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524

+ Details

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

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

+ Details

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

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

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

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

+ Details

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

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

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

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
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:

- Details

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