Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

+ Details

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

- Definition

Amortized cost of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447

+ Details

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

- Definition

Amortized cost of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease.

+ References

+ Details

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

- Definition

Amortized cost of financing receivable originated in current fiscal year. Excludes net investment in lease.

+ References

+ Details

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

- Definition

Amortized cost of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

+ Details

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

- Definition

Amortized cost of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease.

+ References

+ Details

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

- Definition

Amortized cost of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease.

+ References

+ Details

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

- Definition

Amortized cost of financing receivable that can be withdrawn, repaid, and redrawn.

+ References

+ Details

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

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- 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:

Note 7 - Loans Receivable and Allowance for Credit Losses - Loans by Internal Risk Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Pass	$ 841,918
Pass	468,038
Pass	390,683
Pass	337,074
Pass	380,343
Pass	404,624
Pass	241,539
Total loans receivable	3,064,219	$ 2,754,394	$ 2,562,068	$ 2,514,123
Loans receivable	3,064,219	$ 2,754,394	$ 2,562,068	2,514,123
Pass [Member]
Pass	841,918
Pass	468,038
Pass	381,162
Pass	332,394
Pass	380,118
Pass	399,585
Pass	240,770
Total loans receivable	3,043,985			2,495,467
Loans receivable	3,043,985			2,495,467
Special Mention [Member]
Pass	0
Pass	0
Pass	0
Pass	555
Pass	0
Pass	232
Pass	100
Total loans receivable	887			236
Loans receivable	887			236
Substandard [Member]
Pass	0
Pass	0
Pass	9,521
Pass	4,125
Pass	225
Pass	4,807
Pass	669
Total loans receivable	19,347			18,420
Loans receivable	19,347			18,420
Doubtful [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Commercial Real Estate Portfolio Segment [Member]
Pass	190,987
Pass	206,253
Pass	132,016
Pass	111,402
Pass	74,899
Pass	191,344
Pass	8,593
Total loans receivable	915,494			780,311
Loans receivable	915,494			780,311
Commercial Real Estate Portfolio Segment [Member] \| Pass [Member]
Pass	190,987
Pass	206,253
Pass	131,546
Pass	111,402
Pass	74,899
Pass	191,218
Pass	8,593
Total loans receivable	914,898			775,818
Loans receivable	914,898			775,818
Commercial Real Estate Portfolio Segment [Member] \| Special Mention [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Commercial Real Estate Portfolio Segment [Member] \| Substandard [Member]
Pass	0
Pass	0
Pass	470
Pass	0
Pass	0
Pass	126
Pass	0
Total loans receivable	596			4,493
Loans receivable	596			4,493
Commercial Real Estate Portfolio Segment [Member] \| Doubtful [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Construction and Land Development Portfolio Segment [Member]
Pass	23,633
Pass	104,483
Pass	71,394
Pass	18,849
Pass	55
Pass	5,340
Pass	2,874
Total loans receivable	226,627			216,008
Loans receivable	226,627			216,008
Construction and Land Development Portfolio Segment [Member] \| Pass [Member]
Pass	23,633
Pass	104,483
Pass	62,342
Pass	18,849
Pass	55
Pass	5,340
Pass	2,874
Total loans receivable	217,576			216,008
Loans receivable	217,576			216,008
Construction and Land Development Portfolio Segment [Member] \| Special Mention [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Construction and Land Development Portfolio Segment [Member] \| Substandard [Member]
Pass	0
Pass	0
Pass	9,051
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	9,051			0
Loans receivable	9,051			0
Construction and Land Development Portfolio Segment [Member] \| Doubtful [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Commercial Portfolio Segment [Member]
Pass	82,914
Pass	34,435
Pass	15,145
Pass	11,650
Pass	10,407
Pass	18,640
Pass	130,327
Total loans receivable	303,518			252,376
Loans receivable	303,518			252,376
Commercial Portfolio Segment [Member] \| Pass [Member]
Pass	82,914
Pass	34,435
Pass	15,145
Pass	11,650
Pass	10,407
Pass	18,336
Pass	130,227
Total loans receivable	303,114			249,818
Loans receivable	303,114			249,818
Commercial Portfolio Segment [Member] \| Special Mention [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	100
Total loans receivable	100			0
Loans receivable	100			0
Commercial Portfolio Segment [Member] \| Substandard [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	304
Pass	0
Total loans receivable	304			2,558
Loans receivable	304			2,558
Commercial Portfolio Segment [Member] \| Doubtful [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Owner Occupied Real Estate [Member]
Pass	79,930
Pass	96,545
Pass	86,586
Pass	47,221
Pass	71,098
Pass	157,293
Pass	18,823
Total loans receivable	557,496			526,570
Loans receivable	557,496			526,570
Owner Occupied Real Estate [Member] \| Pass [Member]
Pass	79,930
Pass	96,545
Pass	86,586
Pass	42,541
Pass	70,982
Pass	152,707
Pass	18,823
Total loans receivable	548,114			516,741
Loans receivable	548,114			516,741
Owner Occupied Real Estate [Member] \| Special Mention [Member]
Pass	0
Pass	0
Pass	0
Pass	555
Pass	0
Pass	232
Pass	0
Total loans receivable	787			236
Loans receivable	787			236
Owner Occupied Real Estate [Member] \| Substandard [Member]
Pass	0
Pass	0
Pass	0
Pass	4,125
Pass	116
Pass	4,354
Pass	0
Total loans receivable	8,595			9,593
Loans receivable	8,595			9,593
Owner Occupied Real Estate [Member] \| Doubtful [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Consumer Portfolio Segment [Member]
Pass	5,730
Pass	1,892
Pass	1,625
Pass	1,659
Pass	1,349
Pass	2,441
Pass	80,922
Total loans receivable	95,618			83,487
Loans receivable	95,618			83,487
Consumer Portfolio Segment [Member] \| Pass [Member]
Pass	5,730
Pass	1,892
Pass	1,625
Pass	1,659
Pass	1,240
Pass	2,418
Pass	80,253
Total loans receivable	94,817			82,412
Loans receivable	94,817			82,412
Consumer Portfolio Segment [Member] \| Special Mention [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Consumer Portfolio Segment [Member] \| Substandard [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	109
Pass	23
Pass	669
Total loans receivable	801			1,075
Loans receivable	801			1,075
Consumer Portfolio Segment [Member] \| Doubtful [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Residential Portfolio Segment [Member]
Pass	458,724
Pass	14,950
Pass	82,611
Pass	146,293
Pass	222,535
Pass	29,566
Pass	0
Total loans receivable	954,679			536,332
Loans receivable	954,679			536,332
Residential Portfolio Segment [Member] \| Pass [Member]
Pass	458,724
Pass	14,950
Pass	82,611
Pass	146,293
Pass	222,535
Pass	29,566
Pass	0
Total loans receivable	954,679			535,631
Loans receivable	954,679			535,631
Residential Portfolio Segment [Member] \| Special Mention [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Residential Portfolio Segment [Member] \| Substandard [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			701
Loans receivable	0			701
Residential Portfolio Segment [Member] \| Doubtful [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Paycheck Protection Program CARES Act [Member]
Pass	0
Pass	9,480
Pass	1,307
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	10,787			119,039
Loans receivable	10,787			119,039
Paycheck Protection Program CARES Act [Member] \| Pass [Member]
Pass	0
Pass	9,480
Pass	1,307
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	10,787			119,039
Loans receivable	10,787			119,039
Paycheck Protection Program CARES Act [Member] \| Special Mention [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Paycheck Protection Program CARES Act [Member] \| Substandard [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	0			0
Paycheck Protection Program CARES Act [Member] \| Doubtful [Member]
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Pass	0
Total loans receivable	0			0
Loans receivable	$ 0			$ 0