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Purchased Receivables - Allowance on Net Purchase Receivables (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]    
Balance at beginning of period $ 289nrim_ReserveForPurchasedReceivableGainsLosses $ 273nrim_ReserveForPurchasedReceivableGainsLosses
Charge-offs (188)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs (329)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Balance at end of period 265nrim_ReserveForPurchasedReceivableGainsLosses 236nrim_ReserveForPurchasedReceivableGainsLosses
Purchased Receivable    
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]    
Charge-offs 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nrim_PurchasedReceivableMember
0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nrim_PurchasedReceivableMember
Recoveries 30us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nrim_PurchasedReceivableMember
0us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nrim_PurchasedReceivableMember
Charge-offs net of recoveries 30us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nrim_PurchasedReceivableMember
0us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nrim_PurchasedReceivableMember
Reserve for (recovery from) purchased receivables $ (54)us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nrim_PurchasedReceivableMember
$ (37)us-gaap_ProvisionForDoubtfulAccounts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nrim_PurchasedReceivableMember