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Purchased Receivables - Summary of Components of Net Purchased Receivables (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Purchased Receivables [Abstract]        
Purchased receivables $ 15,597nrim_PurchasedReceivables $ 15,543nrim_PurchasedReceivables    
Reserve for purchased receivable losses (265)nrim_ReserveForPurchasedReceivableGainsLosses (289)nrim_ReserveForPurchasedReceivableGainsLosses (236)nrim_ReserveForPurchasedReceivableGainsLosses (273)nrim_ReserveForPurchasedReceivableGainsLosses
Total $ 15,332nrim_PurchasedReceivablesFairValueDisclosure $ 15,254nrim_PurchasedReceivablesFairValueDisclosure