Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Impaired loans	$ 5,678	$ 5,730
Other real estate owned	364	899
Fair Value, Inputs, Level 1 [Member]
Impaired loans	0	0
Other real estate owned	0	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans	0	0
Other real estate owned	0	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans	5,678	5,730
Other real estate owned	$ 364	$ 899

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents impaired loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date.

No definition available.

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