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Purchased Receivables - Summary Of Components Of Net Purchased Receivables (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Purchased Receivables [Abstract]      
Purchased receivables $ 15,543nrim_PurchasedReceivables $ 16,298nrim_PurchasedReceivables  
Reserve for purchased receivable losses (289)nrim_ReserveForPurchasedReceivableGainsLosses (273)nrim_ReserveForPurchasedReceivableGainsLosses (323)nrim_ReserveForPurchasedReceivableGainsLosses
Total $ 15,254nrim_PurchasedReceivablesFairValueDisclosure $ 16,025nrim_PurchasedReceivablesFairValueDisclosure