Basis of Presentation and Significant Accounting Policies	9 Months Ended
Sep. 30, 2016
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies The accompanying unaudited consolidated financial statements and corresponding footnotes have been prepared by Northrim BanCorp, Inc. (the “Company”) in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and with instructions to Form 10-Q under the Securities Exchange Act of 1934, as amended. The year-end Consolidated Balance Sheet data was derived from the Company's audited financial statements. Accordingly, they do not include all of the information and footnotes required by Generally Accepted Accounting Principles ("GAAP") for complete financial statements. The Company owns a 100% interest in Residential Mortgage Holding Company, LLC ("RML"), the parent company of Residential Mortgage, LLC ("Residential Mortgage") and a 50.1% interest in Northrim Benefits Group, LLC ("NBG") and consolidates their balance sheets and income statements into its financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Certain immaterial reclassifications have been made to prior year amounts to maintain consistency with the current year with no impact on net income or total shareholders’ equity. The Company determined that it operates in two primary operating segments: Community Banking and Home Mortgage Lending. The Company has evaluated subsequent events and transactions for potential recognition or disclosure. Operating results for the interim period ended September 30, 2016, are not necessarily indicative of the results anticipated for the year ending December 31, 2016. These consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2015. The Company’s significant accounting policies are discussed in Note 1 to the audited consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2015. Correction of an Error The Company identified and has corrected an error regarding the accounting for payments to be made by the Company to the four former equity owners of RML that were negotiated as part of the Company’s acquisition of 76.5% of the equity interest in RML on December 1, 2014. Three of the four former equity owners of RML have continuing employment contracts with the Company, and under the terms of the acquisition agreement, the payments are terminated for future periods if any two of these three continuing employees terminate employment before November 30, 2019. The fair value of the estimated payments was recorded as acquisition consideration on December 1, 2014, and accrued as a contingent liability. The Company has determined that these payments are more appropriately accounted for as compensation expense in the period they are incurred. Changes in the value of the contingent liability that was initially recorded when the Company acquired RML have previously been reflected on the Company’s Consolidated Statements of Income in the “Change in fair value, RML earn-out liability” line item in prior periods. As of September 30, 2016, this line item has been renamed to “Compensation expense - RML acquisition payments”, and the payments to the sellers of RML are expensed and recorded in the Consolidated Statements of Income in that same line item. Management evaluated the materiality of the error from qualitative and quantitative perspectives and concluded that the error was immaterial to the prior period financial statements taken as a whole. Consequently, the financial statements contained in this report have been revised for the three- and nine-month periods ended September 30, 2016, and prior period financial statements have not been restated. The error correction reduces the total purchase price of RML from $29.5 million to $22.2 million and reduces the amount of goodwill recorded in the RML acquisition from $14.8 million to $7.5 million. The error correction eliminates the contingent liability originally recorded as part of the purchase consideration and results in the accrual of compensation expense, which is included in other liabilities on the Consolidated Balance Sheet. Accrued compensation expense related to these payments is $3.3 million as of September 30, 2016 and represents compensation accrued for the period of December 1, 2015 through September 30, 2016. The error correction reduced net income by $1.4 million and covered the period from December 1, 2014, through June 30, 2016. Additionally, the change in the accounting treatment of these payments also reduced net income for the third quarter of 2016 by $213,000 for a total decrease in net income of $1.6 million in the third quarter of 2016. The change did not affect the total cash flows from operating, investing or financing activities in the Consolidated Statement of Cash Flows. Recent Accounting Pronouncements In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 requires that equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. However, an entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer; simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. When a qualitative assessment indicates that impairment exists, an entity is required to measure the investment at fair value; eliminate the requirement to disclose the fair value of financial instruments measured at amortized cost for entities that are not public business entities; eliminate the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; and clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. ASU 2016-01 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2017, and the Company will apply the amendments by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption and the amendments related to equity securities without readily determinable fair values (including disclosure requirements) will be applied prospectively to equity investments that exist as of the date of adoption of ASU 2016-01. The Company does not believe that the adoption of this standard will have a material impact on the Company’s consolidated financial position or results of operations. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (“ASU 2016-02”). ASU 2016-02 increases transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about lease arrangements. ASU 2016-02 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2018, and must be applied prospectively. The Company is currently evaluating how the adoption of this standard will impact the Company’s consolidated financial position and results of operations. In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Option in Debt Instruments (“ASU 2016-06”). ASU 2016-06 simplifies the embedded derivative analysis for debt instruments containing contingent call or put options by removing the requirement to assess whether a contingent event is related to interest rates or credit risks. ASU 2016-06 is effective for the Company's financial statements for annual and interim periods beginning on or after December 15, 2016, and interim periods within those fiscal years. The Company does not believe that the adoption of this standard will have a material impact on the Company’s consolidated financial position or results of operations. In March 2016, the FASB issued ASU 2016-07, Simplifying the Transition to the Equity Method of Accounting (“ASU 2016-07”). ASU 2016-07 eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. ASU 2016-07 requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. ASU 2016-17 requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. ASU 2016-07 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2016, and must be applied prospectively. The Company does not believe that the adoption of this standard will have a material impact on the Company’s consolidated financial position or results of operations. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2016, and must be applied prospectively. The Company does not believe that the adoption of this standard will have a material impact on the Company’s consolidated financial position or results of operations. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (“ASU 2016-13”). ASU 2016-13 requires a financial asset (or a group of financial assets) that is measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset or assets to present the net carrying value at the amount expected to be collected on the financial asset. The income statement reflects the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The allowance for credit losses for purchased financial assets with a more-than insignificant amount of credit deterioration since origination ("PCD assets") that are measured at amortized cost basis is determined in a similar manner to other financial assets measured at amortized cost basis; however, the initial allowance for credit losses is added to the purchase price rather than being reported as a credit loss expense. Only subsequent changes in the allowance for credit losses are recorded as a credit loss expense for these assets. Interest income for PCD assets should be recognized based on the effective interest rate, excluding the discount embedded in the purchase price that is attributable to the acquirer’s assessment of credit losses at acquisition. ASU 2016-13 requires credit losses relating to available-for-sale debt securities to be recorded through an allowance for credit losses. Available-for-sale accounting recognizes that value may be realized either through collection of contractual cash flows or through sale of the security. Therefore, the amendments limit the amount of the allowance for credit losses to the amount by which fair value is below amortized cost because the classification as available for sale is premised on an investment strategy that recognizes that the investment could be sold at fair value, if cash collection would result in the realization of an amount less than fair value. The allowance for credit losses for purchased available-for-sale securities with a more-than-insignificant amount of credit deterioration since origination is determined in a similar manner to other available-for-sale debt securities; however, the initial allowance for credit losses is added to the purchase price rather than reported as a credit loss expense. Only subsequent changes in the allowance for credit losses are recorded in credit loss expense. Interest income should be recognized based on the effective interest rate, excluding the discount embedded in the purchase price. ASU 2016-13 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2019, and must be applied prospectively. The Company is currently evaluating the impact that the adoption of this standard will have on the Company’s consolidated financial position and results of operations. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). ASU 2016-15 provides guidance on eight specific cash flow issues: debt prepayment or debt extinguishment costs; settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2017, and must be applied retrospectively for each period presented. The Company does not believe that the adoption of this standard will have a material impact on the Company’s consolidated financial position or results of operations.

Basis of Presentation and Significant Accounting Policies

The accompanying unaudited consolidated financial statements and corresponding footnotes have been prepared by Northrim BanCorp, Inc. (the “Company”) in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and with instructions to Form 10-Q under the Securities Exchange Act of 1934, as amended. The year-end Consolidated Balance Sheet data was derived from the Company's audited financial statements. Accordingly, they do not include all of the information and footnotes required by Generally Accepted Accounting Principles ("GAAP") for complete financial statements. The Company owns a 100% interest in Residential Mortgage Holding Company, LLC ("RML"), the parent company of Residential Mortgage, LLC ("Residential Mortgage") and a 50.1% interest in Northrim Benefits Group, LLC ("NBG") and consolidates their balance sheets and income statements into its financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Certain immaterial reclassifications have been made to prior year amounts to maintain consistency with the current year with no impact on net income or total shareholders’ equity. The Company determined that it operates in two primary operating segments: Community Banking and Home Mortgage Lending. The Company has evaluated subsequent events and transactions for potential recognition or disclosure. Operating results for the interim period ended September 30, 2016, are not necessarily indicative of the results anticipated for the year ending December 31, 2016. These consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2015. The Company’s significant accounting policies are discussed in Note 1 to the audited consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2015.

Correction of an Error

The Company identified and has corrected an error regarding the accounting for payments to be made by the Company to the four former equity owners of RML that were negotiated as part of the Company’s acquisition of 76.5% of the equity interest in RML on December 1, 2014. Three of the four former equity owners of RML have continuing employment contracts with the Company, and under the terms of the acquisition agreement, the payments are terminated for future periods if any two of these three continuing employees terminate employment before November 30, 2019. The fair value of the estimated payments was recorded as acquisition consideration on December 1, 2014, and accrued as a contingent liability. The Company has determined that these payments are more appropriately accounted for as compensation expense in the period they are incurred. Changes in the value of the contingent liability that was initially recorded when the Company acquired RML have previously been reflected on the Company’s Consolidated Statements of Income in the “Change in fair value, RML earn-out liability” line item in prior periods. As of September 30, 2016, this line item has been renamed to “Compensation expense - RML acquisition payments”, and the payments to the sellers of RML are expensed and recorded in the Consolidated Statements of Income in that same line item. Management evaluated the materiality of the error from qualitative and quantitative perspectives and concluded that the error was immaterial to the prior period financial statements taken as a whole. Consequently, the financial statements contained in this report have been revised for the three- and nine-month periods ended September 30, 2016, and prior period financial statements have not been restated.

The error correction reduces the total purchase price of RML from $29.5 million to $22.2 million and reduces the amount of goodwill recorded in the RML acquisition from $14.8 million to $7.5 million. The error correction eliminates the contingent liability originally recorded as part of the purchase consideration and results in the accrual of compensation expense, which is included in other liabilities on the Consolidated Balance Sheet. Accrued compensation expense related to these payments is $3.3 million as of September 30, 2016 and represents compensation accrued for the period of December 1, 2015 through September 30, 2016. The error correction reduced net income by $1.4 million and covered the period from December 1, 2014, through June 30, 2016. Additionally, the change in the accounting treatment of these payments also reduced net income for the third quarter of 2016 by $213,000 for a total decrease in net income of $1.6 million in the third quarter of 2016. The change did not affect the total cash flows from operating, investing or financing activities in the Consolidated Statement of Cash Flows.

Recent Accounting Pronouncements

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 requires that equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. However, an entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer; simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. When a qualitative assessment indicates that impairment exists, an entity is required to measure the investment at fair value; eliminate the requirement to disclose the fair value of financial instruments measured at amortized cost for entities that are not public business entities; eliminate the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; and clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. ASU 2016-01 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2017, and the Company will apply the amendments by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption and the amendments related to equity securities without readily determinable fair values (including disclosure requirements) will be applied prospectively to equity investments that exist as of the date of adoption of ASU 2016-01. The Company does not believe that the adoption of this standard will have a material impact on the Company’s consolidated financial position or results of operations.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (“ASU 2016-02”). ASU 2016-02 increases transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about lease arrangements. ASU 2016-02 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2018, and must be applied prospectively. The Company is currently evaluating how the adoption of this standard will impact the Company’s consolidated financial position and results of operations.

In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Option in Debt Instruments (“ASU 2016-06”). ASU 2016-06 simplifies the embedded derivative analysis for debt instruments containing contingent call or put options by removing the requirement to assess whether a contingent event is related to interest rates or credit risks. ASU 2016-06 is effective for the Company's financial statements for annual and interim periods beginning on or after December 15, 2016, and interim periods within those fiscal years. The Company does not believe that the adoption of this standard will have a material impact on the Company’s consolidated financial position or results of operations.

In March 2016, the FASB issued ASU 2016-07, Simplifying the Transition to the Equity Method of Accounting (“ASU 2016-07”). ASU 2016-07 eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. ASU 2016-07 requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. ASU 2016-17 requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. ASU 2016-07 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2016, and must be applied prospectively. The Company does not believe that the adoption of this standard will have a material impact on the Company’s consolidated financial position or results of operations.

In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2016, and must be applied prospectively. The Company does not believe that the adoption of this standard will have a material impact on the Company’s consolidated financial position or results of operations.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (“ASU 2016-13”). ASU 2016-13 requires a financial asset (or a group of financial assets) that is measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset or assets to present the net carrying value at the amount expected to be collected on the financial asset. The income statement reflects the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The allowance for credit losses for purchased financial assets with a more-than insignificant amount of credit deterioration since origination ("PCD assets") that are measured at amortized cost basis is determined in a similar manner to other financial assets measured at amortized cost basis; however, the initial allowance for credit losses is added to the purchase price rather than being reported as a credit loss expense. Only subsequent changes in the allowance for credit losses are recorded as a credit loss expense for these assets. Interest income for PCD assets should be recognized based on the effective interest rate, excluding the discount embedded in the purchase price that is attributable to the acquirer’s assessment of credit losses at acquisition. ASU 2016-13 requires credit losses relating to available-for-sale debt securities to be recorded through an allowance for credit losses. Available-for-sale accounting recognizes that value may be realized either through collection of contractual cash flows or through sale of the security. Therefore, the amendments limit the amount of the allowance for credit losses to the amount by which fair value is below amortized cost because the classification as available for sale is premised on an investment strategy that recognizes that the investment could be sold at fair value, if cash collection would result in the realization of an amount less than fair value. The allowance for credit losses for purchased available-for-sale securities with a more-than-insignificant amount of credit deterioration since origination is determined in a similar manner to other available-for-sale debt securities; however, the initial allowance for credit losses is added to the purchase price rather than reported as a credit loss expense. Only subsequent changes in the allowance for credit losses are recorded in credit loss expense. Interest income should be recognized based on the effective interest rate, excluding the discount embedded in the purchase price. ASU 2016-13 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2019, and must be applied prospectively. The Company is currently evaluating the impact that the adoption of this standard will have on the Company’s consolidated financial position and results of operations.

In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). ASU 2016-15 provides guidance on eight specific cash flow issues: debt prepayment or debt extinguishment costs; settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2017, and must be applied retrospectively for each period presented. The Company does not believe that the adoption of this standard will have a material impact on the Company’s consolidated financial position or results of operations.