Consolidated Statement Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities:
Net income	$ 3,633us-gaap_ProfitLoss	$ 2,703us-gaap_ProfitLoss
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Gain on sale of securities, net	(114)us-gaap_GainLossOnSaleOfInvestments	(97)us-gaap_GainLossOnSaleOfInvestments
Depreciation and amortization of premises and equipment	562us-gaap_DepreciationAndAmortization	420us-gaap_DepreciationAndAmortization
Amortization of software	46	45
Intangible asset amortization	73us-gaap_AmortizationOfIntangibleAssets	52us-gaap_AmortizationOfIntangibleAssets
Amortization of investment security premium, net of discount accretion	(61)	(50)
Deferred tax liability	143	155
Stock-based compensation	118us-gaap_ShareBasedCompensation	107us-gaap_ShareBasedCompensation
Deferral of loan fees and costs, net	(89)	(210)
Provision for loan losses	326us-gaap_ProvisionForLoanAndLeaseLosses	0us-gaap_ProvisionForLoanAndLeaseLosses
Reserve for (recovery from) purchased receivables	(54)nrim_PurchasedReceivablesReserve	(37)nrim_PurchasedReceivablesReserve
Purchases of loans held for sale	0	(30,482)
Proceeds from the sale of loans held for sale	158,365	27,455
Origination of loans held for sale	(176,372)	0
Gain on sale of other real estate owned	0	(294)
Impairment on other real estate owned	268nrim_ImpairmentOnOtherRealEstateOwned	0nrim_ImpairmentOnOtherRealEstateOwned
Equity in undistributed earnings from mortgage affiliate	0	148
Net changes in assets and liabilities:
(Increase) in accrued interest receivable	(411)	(205)
Decrease (increase) in other assets	2,643	(4,899)
Decrease in other liabilities	(9,882)	(1,501)
Net Cash (Used) by Operating Activities	(20,806)	(6,690)
Investing Activities:
Purchases of investment securities available for sale	(16,792)	(39,125)
Proceeds from sales/maturities of securities available for sale	44,701	55,742
Proceeds from redemption of FHLB stock	37	78
(Increase) decrease in purchased receivables, net	(24)	6,162
(Increase) decrease in loans, net	(36,254)	5,774
Proceeds from sale of other real estate owned	311	1,294
Decrease in loan to Elliott Cove, net	0nrim_LoanToEntityNetOfRepayments	49nrim_LoanToEntityNetOfRepayments
Purchases of premises and equipment	(1,368)	(794)
Net Cash (Used) Provided by Investing Activities	(9,389)	29,180
Financing Activities:
Increase (decrease) in deposits	11,266us-gaap_IncreaseDecreaseInDeposits	(5,966)us-gaap_IncreaseDecreaseInDeposits
(Decrease) in securities sold under repurchase agreements	(2,023)	(1,257)
(Decrease) in borrowings	(3,735)us-gaap_ProceedsFromRepaymentsOfDebt	(4,330)us-gaap_ProceedsFromRepaymentsOfDebt
Distributions to noncontrolling interest	(63)	(75)
Cash dividends paid	(1,234)us-gaap_PaymentsOfDividends	(1,112)us-gaap_PaymentsOfDividends
Net Cash Provided (Used) by Financing Activities	4,211	(12,740)
Net Change in Cash and Cash Equivalents	(25,984)	9,750
Cash and Cash Equivalents at Beginning of Period	68,556	85,591
Cash and Cash Equivalents at End of Period	42,572	95,341
Supplemental Information:
Income taxes paid	786us-gaap_IncomeTaxesPaidNet	2us-gaap_IncomeTaxesPaidNet
Interest paid	720us-gaap_InterestPaidNet	442us-gaap_InterestPaidNet
Noncash commitments to invest in Low Income Housing Tax Credit Partnerships	55	0
Transfer of loans to other real estate owned	181	1,137
Transfer of premises to other real estate owned	0us-gaap_TransferToOtherRealEstate	904us-gaap_TransferToOtherRealEstate
Cash dividends declared but not paid	$ 11	$ 10

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow for the purchase of other receivables not otherwise defined in the taxonomy.

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The aggregate cash outflow used to purchase all loans that are held with the intention to resell in the near future.

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The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

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Amount of expense related to estimated loss from loan and lease transactions.

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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