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Business Combinations - Schedule of Loans Acquired with Deteriorating Credit Quality (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Apr. 02, 2014
Business Acquisition [Line Items]    
Fair value of purchased credit impaired loans $ 3,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue $ 3,900us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
Alaska Pacific Bank    
Business Acquisition [Line Items]    
Contractually required principal payments   7,553us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= nrim_AlaskaPacificBankMember
Nonaccretable difference   (3,654)nrim_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesAcquiredDuringPeriodContractualCashFlowsNotExpectedtoBeCollectedNonAccretable
/ us-gaap_BusinessAcquisitionAxis
= nrim_AlaskaPacificBankMember
Fair value of purchased credit impaired loans   $ 3,899us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= nrim_AlaskaPacificBankMember