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Note 15 - Stock Based Compensation (Details) - Stock-based Compensation (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock-based Compensation [Abstract]      
Stock based compensation expense recognized $ 420,000us-gaap_AllocatedShareBasedCompensationExpense $ 325,000us-gaap_AllocatedShareBasedCompensationExpense $ 370,000us-gaap_AllocatedShareBasedCompensationExpense
Number of unvested stock options (in Shares) 1,039,638us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares 909,313us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares 710,600us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
Fair value of unvested stock options 1,548,840frbk_UnvestedStockOptionsFairValue 1,245,679frbk_UnvestedStockOptionsFairValue 1,091,948frbk_UnvestedStockOptionsFairValue
Amount remaining to be recognized as expense $ 702,220us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions $ 545,862us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions $ 467,314us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions