Note 9 - Fair Value Measurements and Fair Values of Financial Instruments - Mortgage Loans Held for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Aggregate Unpaid Principal Balance	$ 5,994	$ 8,241
Excess Carrying Amount Over Aggregate Unpaid Principle Balance	44	297
Reported Value Measurement [Member]
Carrying Amount	$ 6,038	$ 8,538

The amount of mortgage loans held for sale in excess of the unpaid principal balance.

No definition available.

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