Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Interest Income
Interest and fees on loans	$ 13,467	$ 10,871
Interest on investment securities available for sale	885	730
Interest on investment securities held to maturity	23	23
Interest on deposits in other banks	11	49
Total Interest Income	14,386	11,673
Interest Expense
Interest expense on deposits, borrowings and junior subordinated debentures	754us-gaap_InterestExpense	440us-gaap_InterestExpense
Net Interest Income	13,632us-gaap_InterestIncomeExpenseNet	11,233us-gaap_InterestIncomeExpenseNet
Provision for loan losses	326us-gaap_ProvisionForLoanAndLeaseLosses	0us-gaap_ProvisionForLoanAndLeaseLosses
Net Interest Income After Provision for Loan Losses	13,306	11,233
Other Operating Income
Mortgage banking income	7,283	0
Employee benefit plan income	777nrim_EmployeeBenefitPlanIncome	876nrim_EmployeeBenefitPlanIncome
Electronic banking income	622nrim_ElectronicBankingIncome	500nrim_ElectronicBankingIncome
Purchased receivable income	589	481
Service charges on deposit accounts	490	476
Gain on sale of securities, net	114us-gaap_GainLossOnSaleOfSecuritiesNet	97us-gaap_GainLossOnSaleOfSecuritiesNet
Equity in earnings from RML	0nrim_EquityInEarningsLossFromEntity	(131)nrim_EquityInEarningsLossFromEntity
Other income	660us-gaap_OtherOperatingIncome	435us-gaap_OtherOperatingIncome
Total Other Operating Income	10,535us-gaap_NoninterestIncome	2,734us-gaap_NoninterestIncome
Other Operating Expense
Salaries and other personnel expense	10,550us-gaap_LaborAndRelatedExpense	5,920us-gaap_LaborAndRelatedExpense
Occupancy expense	1,604us-gaap_OccupancyNet	877us-gaap_OccupancyNet
Change in fair value, RML earn-out liability	1,502	0
Professional and outside services	751us-gaap_ProfessionalFees	322us-gaap_ProfessionalFees
Marketing expense	617us-gaap_MarketingExpense	614us-gaap_MarketingExpense
Equipment expense	434us-gaap_EquipmentExpense	298us-gaap_EquipmentExpense
Insurance expense	324us-gaap_GeneralInsuranceExpense	185us-gaap_GeneralInsuranceExpense
Software expense	312	260
OREO (income) expense, net rental income and gains on sale	297	(238)
Internet banking expense	220nrim_InternetBankingExpense	200nrim_InternetBankingExpense
Intangible asset amortization expense	73us-gaap_AmortizationOfIntangibleAssets	52us-gaap_AmortizationOfIntangibleAssets
Merger and acquisition expense	0	480
Reserve for (recovery from) purchased receivables	(54)nrim_PurchasedReceivablesReserve	(37)nrim_PurchasedReceivablesReserve
Other operating expense	1,831us-gaap_OtherNoninterestExpense	1,034us-gaap_OtherNoninterestExpense
Total Other Operating Expense	18,461us-gaap_NoninterestExpense	9,967us-gaap_NoninterestExpense
Income Before Provision for Income Taxes	5,380	4,000
Provision for income taxes	1,747us-gaap_IncomeTaxExpenseBenefit	1,297us-gaap_IncomeTaxExpenseBenefit
Net Income	3,633us-gaap_ProfitLoss	2,703us-gaap_ProfitLoss
Less: Net income attributable to the noncontrolling interest	72	45
Net Income Attributable to Northrim BanCorp	$ 3,561us-gaap_NetIncomeLoss	$ 2,658us-gaap_NetIncomeLoss
Earnings Per Share, Basic (USD per share)	$ 0.52us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted (USD per share)	$ 0.51us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted
Weighted Average Shares Outstanding, Basic (shares)	6,854,189	6,537,652
Weighted Average Shares Outstanding, Diluted (shares)	6,930,873	6,629,330

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Equity in earning from investment in affiliate. Earnings from affiliates are recorded using the equity method of accounting.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.

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Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.

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The noninterest income derived from mortgage banking activities (fees and commissions), excluding fees earned from servicing third-party assets.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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The expense in the period incurred with respect to protection provided by insurance entities against risks other than risks associated with production (which are allocated to cost of sales).

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on available-for-sale securities.

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