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Business Combinations - Schedule of Loans Acquired (Details) (Alaska Pacific Bank, USD $)
In Thousands, unless otherwise specified
Apr. 02, 2014
Alaska Pacific Bank
 
Business Acquisition [Line Items]  
Contractually required principal payments $ 133,921us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount
/ us-gaap_BusinessAcquisitionAxis
= nrim_AlaskaPacificBankMember
Purchase adjustment for credit, interest rate, and liquidity 612nrim_BusinessCombinationAcquiredReceivablesPurchaseAdjustmentforCreditInterestRateandLiquidity
/ us-gaap_BusinessAcquisitionAxis
= nrim_AlaskaPacificBankMember
Fair value of purchased non-credit impaired loans $ 134,533us-gaap_BusinessCombinationAcquiredReceivablesFairValue
/ us-gaap_BusinessAcquisitionAxis
= nrim_AlaskaPacificBankMember