Represents percentage of total loans customers with deferred loan payments for financing receivable.

No definition available.

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

- Definition

Represents percentage of total loans customers with deferred loan principal payments for financing receivable.

+ References

No definition available.

+ Details

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

- Definition

Deferred amounts on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19.

+ References

No definition available.

+ Details

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

- Definition

The amount of deferred payments classified as principal of financing receivable.

+ References

No definition available.

+ Details

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

- Definition

Number of payment deferrals on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19.

+ References

No definition available.

+ Details

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

- Definition

Number of mortgage loans in process of foreclosure.

+ References

No definition available.

+ Details

Name:	frbk_NumberOfMortgageLoansInProcessOfForeclosure
Namespace Prefix:	frbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554

+ Details

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

- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5162-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4437-111522

+ Details

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

- Details

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

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=frbk_SecondDeferredLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 6 - Loans Receivable and Allowance for Loan Losses (Details Textual)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	$ 190,000	$ 145,000	$ 587,000	$ 378,000
Financing Receivable, Number of Payment Deferrals	95		95			491
Financing Receivable, Deferred Payments	$ 115,000,000		$ 115,000,000			$ 444,000,000
Financing Receivable, Customers with Deferred Loan Payments, Percentage of Total Loans	6.00%		6.00%			24.00%
Financing Receivable, Deferred Payments, Principal	$ 65,000,000		$ 65,000,000
Financing Receivable, Customers with Deferred Loan Payments, Principal, Percentage of Total Loans	3.00%		3.00%
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0		0		0
Number of Mortgage Loans in Process of Foreclosure			1		1
Real Estate Acquired Through Foreclosure	$ 1,113,000		$ 1,113,000		$ 1,730,000
Residential Portfolio Segment [Member]
Real Estate Acquired Through Foreclosure	$ 0		$ 0		$ 0
Second Deferred Loans [Member]
Financing Receivable, Number of Payment Deferrals	52		52
Financing Receivable, Deferred Payments	$ 70,000,000		$ 70,000,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Number of Payment Deferrals	43		43
Financing Receivable, Deferred Payments	$ 45,000,000		$ 45,000,000