Northrim BanCorp (NRIM) 10-K 13 Mar 18 2017 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Mar. 13, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Entity Registrant Name	NORTHRIM BANCORP INC
Entity Central Index Key	1,163,370
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding		6,871,963
Entity Public Float			$ 205,581,946
Trading Symbol	NRIM

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 25,016	$ 34,485
Interest bearing deposits in other banks	52,825	16,066
Investment securities available for sale	312,750	331,219
Investment securities held to maturity	0	899
Total portfolio investments	312,750	332,118
Investment in Federal Home Loan Bank stock	2,115	1,965
Loans held for sale	43,778	43,596
Loans	955,667	975,015
Allowance for loan losses	(21,461)	(19,697)
Net loans	934,206	955,318
Purchased receivables, net	22,231	20,491
Mortgage servicing rights, at fair value	7,305	4,157
OREO, net	8,651	6,574
Premises and equipment, net	37,867	39,318
Goodwill	15,017	15,017
Other intangible assets, net	1,207	1,307
Other assets	56,141	56,128
Total assets	1,519,109	1,526,540
Deposits:
Demand	414,686	449,206
Interest-bearing demand	252,009	201,349
Savings	247,458	241,088
Money market	243,603	244,295
Certificates of deposit less than $250,000	69,283	86,053
Certificates of deposit $250,000 and greater	31,244	45,662
Total deposits	1,258,283	1,267,653
Securities sold under repurchase agreements	27,746	27,607
Borrowings	7,362	4,338
Junior subordinated debentures	10,310	18,558
Other liabilities	22,606	21,672
Total liabilities	1,326,307	1,339,828
COMMITMENTS AND CONTINGENTCIES (NOTE 17)
SHAREHOLDERS' EQUITY
Preferred stock, $1 par value, 2,500,000 shares authorized, none issued or outstanding	0	0
Common stock, $1 par value, 10,000,000 shares authorized, 6,871,963 and 6,897,890 shares issued and outstanding at December 31, 2017 and December 31, 2016, respectively	6,872	6,898
Additional paid-in capital	61,793	62,952
Retained earnings	124,407	117,141
Accumulated other comprehensive loss	(270)	(397)
Total Northrim BanCorp, Inc. shareholders' equity	192,802	186,594
Noncontrolling interest	0	118
Total shareholders' equity	192,802	186,712
Total liabilities and shareholders' equity	$ 1,519,109	$ 1,526,540

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value (in USD per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	2,500,000	2,500,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in USD per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares issued (in shares)	6,871,963	6,897,890
Common stock, shares outstanding (in shares)	6,871,963	6,897,890

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Income
Interest and fees on loans and loans held for sale	$ 55,041	$ 54,777	$ 56,166
Interest on investment securities available for sale	4,575	3,895	3,393
Interest on investment securities held to maturity	59	41	68
Interest on deposits in other banks	433	205	153
Total Interest Income	60,108	58,918	59,780
Interest Expense
Interest expense on deposits	1,707	1,870	1,939
Interest expense on securities sold under agreements to repurchase	34	30	23
Interest expense on borrowings	173	127	446
Interest expense on junior subordinated debentures	516	534	463
Total Interest Expense	2,430	2,561	2,871
Net Interest Income	57,678	56,357	56,909
Provision for loan losses	3,200	2,298	1,754
Net Interest Income After Provision for Loan Losses	54,478	54,059	55,155
Other Operating Income
Mortgage banking income	23,287	29,507	29,613
Gain on sale of Northrim Benefits Group	4,445	0	0
Purchased receivable income	2,975	2,347	2,287
Bankcard fees	2,597	2,670	2,671
Employee benefit plan income	2,506	3,770	3,651
Service charges on deposit accounts	1,614	1,998	2,103
Gain (loss) on sale of securities	11	(11)	271
Other income	3,039	2,982	4,012
Total Other Operating Income	40,474	43,263	44,608
Other Operating Expense
Salaries and other personnel expense	44,721	46,752	43,931
Occupancy expense	6,752	6,462	6,332
Data processing expense	5,549	4,879	4,313
Marketing expense	2,566	2,449	2,728
Professional and outside services	2,365	2,797	2,980
Insurance expense	1,161	1,023	1,339
OREO expense, net of rental income and gains on sale	837	98	190
Compensation expense - RML acquisition payments	130	4,775	4,094
Intangible asset amortization expense	100	135	258
Reserve (benefit) for purchased receivables	29	(10)	(138)
Loss on sale of premises and equipment	3	352	37
Other operating expense	6,940	6,568	6,581
Total Other Operating Expense	71,153	76,280	72,645
Income Before Provision for Income Taxes	23,799	21,042	27,118
Provision for income taxes	10,321	6,052	8,784
Net Income	13,478	14,990	18,334
Less: Net income attributable to the noncontrolling interest	327	579	551
Net Income Attributable to Northrim BanCorp, Inc.	$ 13,151	$ 14,411	$ 17,783
Earnings per share, basic (in USD per share)	$ 1.91	$ 2.09	$ 2.59
Earnings per share, diluted (in USD per share)	$ 1.88	$ 2.06	$ 2.56
Weighted Average Shares Outstanding, Basic (in shares)	6,889,621	6,883,663	6,859,209
Weighted Average Shares Outstanding, Diluted (in shares)	6,977,910	6,974,864	6,948,474

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 13,478	$ 14,990	$ 18,334
Securities available for sale:
Unrealized holding gains (losses) arising during the period	175	42	(795)
Reclassification of net (gains) losses included in net income (net of tax benefit (expense) $5, ($5), and $111 in 2017, 2016 and 2015, respectively)	(6)	6	(160)
Derivatives and hedging activities:
Unrealized holding gains arising during the period	184	0	0
Income tax (expense) benefit related to unrealized gains and losses	(141)	(33)	296
Other comprehensive income (loss), net of tax	212	15	(659)
Comprehensive income	13,690	15,005	17,675
Less: comprehensive income attributable to the noncontrolling interest	327	579	551
Comprehensive income attributable to Northrim BanCorp, Inc.	$ 13,363	$ 14,426	$ 17,124

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Reclassification of net gains, tax (expense) benefit	$ 5	$ (5)	$ 111

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interest
Beginning balance (in shares) at Dec. 31, 2014		6,854,000
Beginning balance, value at Dec. 31, 2014	$ 164,441	$ 6,854	$ 61,729	$ 95,493	$ 247	$ 118
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend declared	(5,126)			(5,126)
Stock-based compensation expense	608		608
Exercise of stock options and vesting of restricted stock units, net (in shares)		23,000
Exercise of stock options and vesting of restricted stock units, net	50	$ 23	27
Excess tax benefits from share-based payment arrangements	56		56
Distributions to noncontrolling interest	(490)					(490)
Other comprehensive income (loss), net of tax	(659)				(659)
Net income attributable to the noncontrolling interest	551					551
Net income attributable to Northrim BanCorp, Inc.	17,783			17,783
Ending balance (in shares) at Dec. 31, 2015		6,877,000
Ending balance, value at Dec. 31, 2015	177,214	$ 6,877	62,420	108,150	(412)	179
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend declared	(5,420)			(5,420)
Stock-based compensation expense	778		778
Exercise of stock options and vesting of restricted stock units, net (in shares)		21,000
Exercise of stock options and vesting of restricted stock units, net	$ (162)	$ 21	(183)
Treasury stock buy-back (in shares)	0
Excess tax benefits from share-based payment arrangements	$ (63)		(63)
Distributions to noncontrolling interest	(640)					(640)
Other comprehensive income (loss), net of tax	15				15
Net income attributable to the noncontrolling interest	579					579
Net income attributable to Northrim BanCorp, Inc.	$ 14,411			14,411
Ending balance (in shares) at Dec. 31, 2016	6,897,890	6,898,000
Ending balance, value at Dec. 31, 2016	$ 186,712	$ 6,898	62,952	117,141	(397)	118
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend declared	(5,970)			(5,970)
Stock-based compensation expense	665		665
Exercise of stock options and vesting of restricted stock units, net (in shares)		32,000
Exercise of stock options and vesting of restricted stock units, net	$ (243)	$ 32	(275)
Treasury stock buy-back (in shares)	(58,341)	(58,000)
Treasury stock buy-back	$ (1,607)	$ (58)	(1,549)
Distributions to noncontrolling interest	(445)					(445)
Other comprehensive income (loss), net of tax	212				212
Reclassification for remeasuring of deferred tax asset related to investment securities	0			85	(85)
Net income attributable to the noncontrolling interest	327					327
Net income attributable to Northrim BanCorp, Inc.	$ 13,151			13,151
Ending balance (in shares) at Dec. 31, 2017	6,871,963	6,872,000
Ending balance, value at Dec. 31, 2017	$ 192,802	$ 6,872	$ 61,793	$ 124,407	$ (270)	$ 0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities:
Net income	$ 13,478	$ 14,990	$ 18,334
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Loss (gain) on sale of securities, net	(11)	11	(271)
Loss on sale of premises and equipment	3	352	37
Gain on sale of Northrim Benefits Group	(4,445)	0	0
Depreciation and amortization of premises and equipment	2,867	2,439	2,264
Amortization of software	675	157	179
Intangible asset amortization	100	135	258
Amortization of investment security premium, net of discount accretion	332	27	(202)
Deferred tax expense (benefit)	4,004	(325)	148
Stock-based compensation	665	778	608
Excess tax expense (benefit) from share-based payment arrangements	0	63	(56)
Deferral of loan fees and costs, net	(278)	(178)	61
Provision for loan losses	3,200	2,298	1,754
Reserve (benefit) for purchased receivables	29	(10)	(138)
Additions to mortgage servicing rights carried at fair value	(3,146)	(3,029)	(802)
Change in fair value of mortgage servicing rights carried at fair value	(2)	526	158
Gain on sale of loans	(18,013)	(25,413)	(26,398)
Proceeds from the sale of loans held for sale	571,909	768,169	773,526
Origination of loans held for sale	(554,078)	(735,799)	(753,815)
Gain on sale of other real estate owned	(371)	(295)	(315)
Impairment on other real estate owned	904	187	361
Impairment on equity method investment	686	0	0
Net changes in assets and liabilities:
Increase in accrued interest receivable	(651)	(114)	(247)
(Increase) decrease in other assets	841	10,015	6,232
Increase (decrease) in other liabilities	586	(14,861)	(11,041)
Net Cash Provided by Operating Activities	19,284	20,123	10,635
Investment in securities:
Purchases of investment securities available for sale	(84,339)	(145,707)	(210,308)
Purchases of FHLB stock	(3,665)	(751)	0
Proceeds from sales/calls/maturities of securities available for sale	102,660	105,621	200,343
Proceeds from calls/maturities of securities held to maturity	890	0	1,285
Proceeds from maturities of domestic certificates of deposit	0	0	3,500
Proceeds from redemption of FHLB stock	3,515	602	1,588
(Increase) decrease in purchased receivables, net	(1,769)	(7,155)	2,066
Decrease (increase) in loans, net	12,278	1,160	(57,927)
Proceeds from sale of other real estate owned	3,302	934	2,733
Proceeds from the sale of Northrim Benefits Group	4,625	0	0
Investment in other real estate owned	0	(311)	0
Elliott Cove divestiture, net of cash received	0	0	219
Purchases of software	(5,680)	0	(116)
Proceeds from sales of premises and equipment	116	1,401	188
Purchases of premises and equipment	(1,555)	(3,293)	(7,026)
Net Cash Provided (Used) by Investing Activities	30,378	(47,499)	(63,455)
Financing Activities:
Increase (decrease) in deposits	(9,370)	26,861	61,045
Increase (decrease) in securities sold under repurchase agreements	139	(3,813)	11,577
Proceeds from borrowings	3,097	2,265	0
Repayments of borrowings	(73)	(47)	(24,184)
Distributions to noncontrolling interest	(445)	(640)	(490)
Repayment of junior subordinated debentures	(8,248)	0	0
Proceeds from the issuance of common stock	100	0	50
Repurchase of common stock	(1,607)	0	0
Excess tax benefits from share-based payment arrangements	0	0	56
Cash dividends paid	(5,965)	(5,372)	(5,117)
Net Cash (Used) Provided by Financing Activities	(22,372)	19,254	42,937
Net Change in Cash and Cash Equivalents	27,290	(8,122)	(9,883)
Cash and Cash Equivalents at Beginning of Year	50,551	58,673	68,556
Cash and Cash Equivalents at End of Year	77,841	50,551	58,673
Supplemental Information:
Income taxes paid	7,764	4,414	5,674
Interest paid	2,470	2,553	2,833
Noncash commitments to invest in Low Income Housing Tax Credit Partnerships	0	6,809	55
Transfer of loans to other real estate owned	5,912	4,036	1,259
Cash dividends declared but not paid	$ 53	$ 48	$ 46

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations: Northrim BanCorp, Inc. (the “Company”), is a publicly traded bank holding company headquartered in Anchorage, Alaska that is primarily engaged in the delivery of business and personal banking services through its wholly-owned banking subsidiary, Northrim Bank ("the Bank"). The Bank also engages in retail mortgage origination services through its wholly-owned subsidiary, Residential Mortgage Holding Company, LLC (“RML”). Additionally, the Bank operates a factoring division in Bellevue, Washington. Related companies include Pacific Wealth Advisors, LLC (“PWA”) and Homestate Mortgage Company, LLC ("Homestate"). The Company also has a 50.1% ownership interest in Northrim Benefits Group, LLC ("NBG"), however, the Company sold all of the assets of NBG in 2017. Method of Accounting: The Company prepares its consolidated financial statements in conformity with accounting principles generally accepted in the United States and prevailing practices within the banking industry. The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of income, gains, expenses, and losses during the reporting periods. Actual results could differ from those estimates. Significant estimates include the allowance for loan losses (“Allowance”), valuation of goodwill and other intangibles, valuation of other real estate owned (“OREO”), valuation of mortgage servicing rights, and fair value disclosures. Consolidation: The Company consolidates affiliates in which we have a controlling interest. The accompanying consolidated financial statements include the accounts of the Company, the Bank, RML, NBG, and Northrim Investment Services Company (“NISC”). Significant intercompany balances have been eliminated in consolidation. As of December 31, 2017, the Company had one wholly-owned trust ("Trust") that was formed to issue trust preferred securities and related common securities of the Trust. The Company has not consolidated the accounts of the Trust in its consolidated financial statements in accordance with Financial Accounting Standards Board Accounting Standards Codification (“FASB”) ASC 810, Consolidation (“ASC 810”). As a result, the junior subordinated debentures issued by the Company to the Trust are reflected on the Company’s consolidated balance sheet as junior subordinated debentures. The Company has determined that PWA and Homestate are not variable interest entities and therefore, the Company does not consolidate the balance sheets and income statements of PWA or Homestate into its financial statements. The Company's investments in PWA and Homestate are accounted for as equity method investments. Results of PWA and Homestate are included in "Other income" in our Consolidated Statements of Income. Investments in associated companies are presented on a one-line basis in the caption “Other assets” in our Consolidated Balance Sheets. Operating Segments: Public enterprises are required to report certain information about their operating segments in a complete set of financial statements to shareholders. The basis for determining the Company's operating segments is the manner in which management operates the business. Management has identified two primary business segments; Community Banking and Home Mortgage Lending. Reclassifications: Certain 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. Subsequent Events: The Company has evaluated events and transactions subsequent to December 31, 2017 for potential recognition or disclosure. Cash and Cash Equivalents: For purposes of reporting cash flows, cash and cash equivalents include cash on hand, amounts due from banks, interest-bearing deposits with other banks, federal funds sold, and securities with original maturities of less than 90 days at acquisition. Investment Securities: Securities available for sale are stated at fair value with unrealized holding gains and losses, net of tax, excluded from earnings and reported as a separate component of other comprehensive income, unless an unrealized loss is deemed other than temporary. Gains and losses on available for sale securities sold are determined on a specific identification basis. Held to maturity securities are stated at cost, adjusted for amortization of premium and accretion of discount on a level-yield basis. The Company has the ability and intent to hold these securities to maturity. A decline in the market value of any available for sale or held to maturity security below cost that is deemed other than temporary results in a charge to earnings and the establishment of a new cost basis for the security. Unrealized investment securities losses are evaluated at least quarterly on a specific identification basis to determine whether such declines in value should be considered "other than temporary" and therefore be subject to immediate loss recognition in income. Although these evaluations involve significant judgment, an unrealized loss in the fair value of a debt security is generally deemed to be temporary when the fair value of the security is below the carrying value primarily due to changes in interest rates and there has not been significant deterioration in the financial condition of the issuer. The Company does not intend to sell, nor is it more likely than not that it will be required to sell, securities whose market value is less than carrying value. Because it is more likely than not that the Company will hold these investments until a market price recovery or maturity, these investments are not considered other than temporarily impaired. Other factors that may be considered in determining whether a decline in the value is "other than temporary" include the financial condition, capital strength, and near-term prospects of the issuer; actions of commercial banks or other lenders relative to the continued extension of credit facilities to the issuer of the security; recommendations of investment advisors or market analysts; and ratings by recognized rating agencies. Federal Home Loan Bank Stock: The Company’s investment in Federal Home Loan Bank of Des Moines (“FHLB”) stock is carried at par value because the shares can only be redeemed with the FHLB at par. The Company is required to maintain a minimum level of investment in FHLB stock based on the Company’s total Bank assets and outstanding advances. FHLB stock is carried at cost and is subject to recoverability testing at least annually. Loans held for sale: The Company designates loans held for sale as either fair value or the lower of cost or fair value at origination. Loans held for sale include residential mortgage loans that have been originated for sale in the secondary market. Related gains or losses on the sale of these loans are recognized in mortgage banking income. Loans: Loans are carried at their principal amount outstanding, net of charge-offs, unamortized fees, and direct loan origination costs. Loan balances are charged-off to the Allowance when management believes that collection of principal is unlikely. Interest income on loans is accrued and recognized on the principal amount outstanding except for loans in a nonaccrual status. All classes of loans are placed on nonaccrual when management believes doubt exists as to the collectability of the interest or principal. Cash payments received on nonaccrual loans are directly applied to the principal balance. Generally, a loan may be returned to accrual status when the delinquent principal and interest is brought current in accordance with the terms of the loan agreement and certain ongoing performance criteria have been met. Loans are reported as past due when installment payments, interest payments, or maturity payments are past due based on contractual terms. The Company considers a loan to be impaired when it is probable that it will be unable to collect all amounts due according to the contractual terms of the loan agreement. Once a loan is determined to be impaired, the impairment is measured based on the present value of the expected future cash flows discounted at the loan’s effective interest rate, unless the loan is collateral dependent, in which case the impairment is measured by using the fair value of the loan’s collateral. Nonperforming loans greater than $50,000 are individually evaluated for impairment based upon the borrower’s overall financial condition, resources, and payment record, and the prospects for support from any financially responsible guarantors. The Company uses either in-house evaluations or external appraisals to estimate the fair value of collateral-dependent impaired loans as of each reporting date. The Company’s determination of which method to use is based upon several factors. The Company takes into account compliance with legal and regulatory guidelines, the amount of the loan, the estimated value of the collateral, the location and type of collateral to be valued, and how critical the timing of completion of the analysis is to the assessment of value. Those factors are balanced with the level of internal expertise, internal experience, and market information available, versus external expertise available such as qualified appraisers, brokers, auctioneers, and equipment specialists. The Company uses external appraisals to estimate fair value for projects that are not fully constructed as of the date of valuation. These projects are generally valued as if complete, with an appropriate allowance for cost of completion, including contingencies developed from external sources such as vendors, engineers, and contractors. The Company classifies fair value measurements using observable inputs, such as external appraisals, as level 2 valuations in the fair value hierarchy, and fair value measurements with unobservable inputs, such as in-house evaluations, as level 3 valuations in the fair value hierarchy. When the fair value measurement of the impaired loan is less than the recorded amount of the loan, an impairment is recognized by recording a charge-off to the Allowance or by designating a specific reserve in accordance with GAAP. The Company’s policy is to record cash payments received on impaired loans that are not also nonaccrual loans in the same manner that cash payments are applied to performing loans. A loan is classified as a troubled debt restructuring ("TDR") when a borrower is experiencing financial difficulties that lead to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. These concessions may include interest rate reductions, principal forgiveness, extension of maturity date and other actions intended to minimize potential losses. Generally, a nonaccrual loan that is restructured remains on nonaccrual status for a period of at least six months to demonstrate that the borrower can meet the restructured terms. If the borrower's performance under the new terms is not reasonably assured, the loan remains classified as a nonaccrual loan. Interest on TDRs will be accrued at the restructured rates when it is anticipated that no loss of original principal will occur, and the interest can be collected, which is generally after a period of six months. Loan origination fees received in excess of direct origination costs are deferred and accreted to interest income using a method approximating the level-yield method over the life of the loan. Acquired Loans: Loans are recorded at their fair value at the acquisition date. Credit discounts are included in the determination of fair value; therefore, an allowance for loan losses is not recorded at the acquisition date. Purchased loans are evaluated upon acquisition and classified as either purchased credit impaired or purchased non-credit-impaired. Purchased credit impaired loans reflect credit deterioration since origination such that it is probable at acquisition that the Company will be unable to collect all contractually required payments. Purchased credit impaired loans were individually evaluated for credit impairment at acquisition using expected future cash flows or the estimated value of underlying collateral. A purchased credit impaired loan will be removed from impaired loans only if the loan is sold, foreclosed, or assets are received in full satisfaction of the loan, and it will be removed from impaired loans at its carrying value. If an individual loan is removed, the difference between its relative carrying amount and its cash, fair value of the collateral, or other assets received will be recognized in other income immediately as a gain and would not affect the effective yield used to recognize the accretable yield on purchased credit impaired loans. The excess of the undiscounted contractual balances due over the cash flows expected to be collected is considered to be the nonaccretable difference. The nonaccretable difference represents our estimate of the credit losses expected to occur and was considered in determining the fair value of the purchased credit impaired loans as of the acquisition date. Subsequent to the acquisition date, any increases in expected cash flows over those expected at purchase date in excess of fair value are adjusted through an increase to the accretable yield on a prospective basis. The purchased credit impaired loans are and will continue to be subject to the Company’s internal and external credit review and monitoring. If credit deterioration is experienced subsequent to the initial acquisition fair value amount, such deterioration will be measured, and a charge-off will be recorded. For purchased non-credit-impaired loans, the difference between the fair value and unpaid principal balance of the loan at the acquisition date is amortized or accreted to interest income over the estimated life of the loans. For the purpose of estimating the Allowance, the Company has evaluated the credit quality of purchased non-credit-impaired loans separately from loans that were originated by the Company; however, purchased non-credit-impaired loans that have been identified as impaired subsequent to the merger are included in the Company's normal process for reporting impaired loans and calculation of a specific valuation allowance. Purchases of non-credit-impaired loans that have not been identified as impaired subsequent to the merger are evaluated for significant changes subsequent to the merger to determine if the underlying credit quality of these loans would require a provision and establishment of an allowance specific to these loans. Allowance for Loan Losses: The Allowance for Loan Losses is management’s best estimate of probable losses inherent in its loan portfolio. Accordingly, the methodology is based on historical loss experience by loan segment and class with adjustments for current events and conditions. The Company’s process for determining the appropriate level of the Allowance for probable loan losses is designed to account for credit deterioration as it occurs. The provision for loan losses reflects loan quality trends, including levels of and trends related to past due and nonaccrual loans, net charge-offs or recoveries, and other factors. The Company has identified the following segments: commercial, real estate construction one-to-four family, real estate construction other, real estate term owner occupied, real estate term non-owner occupied, real estate term other, consumer loans secured by 1 st deeds of trust, and other consumer loans. Then the Company further disaggregates each segment into the following classes, which are also known as asset quality ratings: pass (grades 1-6), special mention (grade 7), substandard (grade 8), doubtful (grade 9), and loss (grade 10). The level of the Allowance reflects management’s continuing evaluation of industry concentrations, specific credit risks, loan loss experience, current loan portfolio quality, present economic, political and regulatory conditions and unidentified losses inherent in the current loan portfolio. Portions of the allowance may be allocated for specific credits; however, the entire allowance is available for any credit that, in management’s judgment, should be charged off. While management utilizes its best judgment and information available, the ultimate adequacy of the Allowance is dependent upon a variety of factors beyond the Company’s control including, among other things, the performance of the Company’s loan portfolio, the economy, changes in interest rates, and the view of the regulatory authorities toward loan classification. The Company’s Allowance consists of three elements: (1) specific valuation allowances based on probable losses on specific loans, (2) general valuation allowances based on historical loan loss experience for similar loans with similar characteristics and trends, adjusted as necessary to reflect the impact of current conditions, and (3) unallocated general valuation allowances based on general economic conditions and other qualitative risk factors both internal and external to the Company. The specific valuation allowance is an allocated allowance for impaired loans. This analysis is based upon a specific analysis for each impaired loan that is collateral dependent, including appraisals and in-house evaluations on loans secured by real property, management’s assessment of the current market, recent payment history, and an evaluation of other sources of repayment. The Company obtains appraisals on real and personal property that secure its loans during the loan origination process in accordance with regulatory guidance and its loan policy. The Company then estimates a general allocated allowance for all other loans that were not impaired as of the balance sheet date using a formula-based approach that includes average historical loss factors that are adjusted for quantitative and qualitative factors. Qualitative factors are based on management’s assessment of current trends that may cause losses inherent in the current loan portfolio to differ significantly from historical losses. The Company uses a formula-based approach that includes average historical loss factors that are adjusted for qualitative factors to establish this portion of the Allowance. After the portfolio has been disaggregated into segments and classes, the Company calculates a general reserve for each segment and class based on the average five year loss history for each segment and class. This general reserve is then adjusted for qualitative factors, by segment and class. Qualitative factors are based on management’s assessment of current trends that may cause losses inherent in the current loan portfolio to differ significantly from historical losses. Some factors that management considers in determining the qualitative adjustment to the general reserve include our concentration of large borrowers; national and local economic trends; general business conditions; economic, political, and industry specific factors that affect resource development in Alaska; underwriting policies and standards; trends in local real estate markets; effects of various political activities; peer group data; and internal factors such as underwriting policies and expertise of the Company’s employees. The unallocated general valuation portion of the Allowance is based on several factors, including the level of the Allowance as compared to total loans and nonperforming loans in light of current economic conditions. This portion of the Allowance is deemed “unallocated” because it is not allocated to any segment or class of the loan portfolio. This portion of the Allowance provides for coverage of credit losses inherent in the loan portfolio but not captured in the credit loss factors that are utilized in the risk rating-based component or in the specific impairment component of the Allowance and acknowledges the inherent imprecision of all loss prediction models. This portion of the Allowance is based upon management’s evaluation of various factors that are not directly measured in the determination of the allocated portions of the Allowance. Such factors include uncertainties in identifying triggering events that directly correlate to subsequent loss rates, uncertainties in economic conditions, risk factors that have not yet manifested themselves in loss allocation factors, and historical loss experience data that may not precisely correspond to the current portfolio. In addition, the unallocated reserve may fluctuate based upon the direction of various risk indicators. Examples of such factors include the risk as to current and prospective economic conditions, the level and trend of charge offs or recoveries, and the risk of heightened imprecision or inconsistency of appraisals used in estimating real estate values. Although this allocation process may not accurately predict credit losses by loan type or in aggregate, the total allowance for credit losses is available to absorb losses that may arise from any loan type or category. Based on our methodology and its components, management believes the resulting Allowance is adequate and appropriate for the risk identified in the Company's loan portfolio. While management believes that it uses the best information available to determine the Allowance, unforeseen market conditions and other events could result in adjustment to the Allowance, and net income could be significantly affected if circumstances differed substantially from the assumptions used in making the final determination. Our banking regulators, as an integral part of their examination process, periodically review the Company's Allowance. Our regulators may require the Company to recognize additions to the Allowance based on their judgments related to information available to them at the time of their examinations. Reserve for Unfunded Loan Commitments and Letters of Credit: The Company maintains a separate reserve for losses related to unfunded loan commitments and letters of credit. The determination of the adequacy of the reserve is based on periodic evaluations of the unfunded credit facilities including assessment of historical losses and current economic conditions. The allowance for unfunded loan commitments and letters of credit is included in other liabilities on the Consolidated Balance Sheets, with changes to the balance charged against noninterest expense. Purchased Receivables: The Bank purchases accounts receivable from its customers. The purchased receivables are carried at their principal amount outstanding, net of a reserve for anticipated losses that have not yet been identified. Fees charged to the customer are earned while the balances of the purchases are outstanding, which is typically less than one year. The Company maintains a separate reserve for losses related to purchased receivable assets. The determination of the adequacy of the reserve is based on periodic evaluations of purchased receivable assets including an assessment of historical losses and current economic conditions. The reserve for purchased receivable assets is included in the balance of these accounts on a net basis on the consolidated balance sheets, with changes to the balance charged against noninterest expense. Other Real Estate Owned: Other real estate owned represents properties acquired through foreclosure or its equivalent. Prior to foreclosure, the carrying value is adjusted to the fair value, less cost to sell, of the real estate to be acquired by an adjustment to the Allowance. Management’s evaluation of fair value is based on appraisals or discounted cash flows of anticipated sales. After foreclosure, any subsequent reduction in the carrying value is charged against earnings. Operating expenses associated with other real estate owned are charged to earnings in the period they are incurred. Premises and Equipment: Premises and equipment, including leasehold improvements, are stated at cost, less accumulated depreciation and amortization. Depreciation and amortization expense for financial reporting purposes is computed using the straight-line method based upon the shorter of the lease term or the estimated useful lives of the assets that vary according to the asset type and include; furniture and equipment ranging between 3 and 7 years , leasehold improvements ranging between 2 and 15 years , and buildings at 39 years . Maintenance and repairs are charged to current operations, while renewals and betterments are capitalized. Long-lived assets such as premises and equipment are reviewed for impairment at least annually or whenever events or changes in business circumstances indicate that the remaining useful life may warrant revision, or that the carrying amount of the long-lived asset may not be fully recoverable. If impairment is determined to exist, any related impairment loss is calculated based on fair value. Impairment losses on assets to be disposed of, if any, are based on the estimated proceeds to be received, less costs of disposal. Goodwill and Other Intangible Assets: Intangible assets are comprised of goodwill and other intangibles acquired in business combinations. Goodwill and intangible assets with indefinite useful lives are not amortized. Intangible assets with definite useful lives are amortized to their estimated residual values over their respective useful lives, and are also reviewed for impairment. Amortization of intangible assets is included in other operating expense in the Consolidated Statements of Income. The Company performs a goodwill impairment analysis at the segment level on an annual basis. Additionally, the Company performs a goodwill impairment evaluation on an interim basis when events or circumstances indicate impairment potentially exists. Low Income Housing Tax Credit Partnerships: The Company earns a return on its investments in these partnerships in the form of tax credits and deductions that flow through to it as a limited partner. The Company amortizes these investments in tax expense over the period during which tax credits are used. Mortgage Servicing Rights: Mortgage servicing rights ("MSRs") are the rights to service mortgage loans for others. The Company measures MSRs at fair value and reports changes in fair value through earnings. Changes in the fair value of MSRs occur primarily due to the collection/realization of expected cash flows, as well as changes in valuation inputs and assumptions. Under the fair value method, MSRs are carried on the balance sheet at fair value and the changes in fair value are reported in earnings in other operating income in the period in which the change occurs. Fair value measurements are determined using a discounted cash flow model. In order to determine the fair value of MSRs, the present value of net expected future cash flows is estimated. Assumptions used include market discount rates, anticipated prepayment speeds, escrow calculations, delinquency rates, and ancillary fee income net of servicing costs. The model assumptions are also compared to publicly filed information from several large MSR holders, as available. Other Assets: Other assets include purchased software and prepaid expenses. Purchased software is carried at amortized cost and is amortized using the straight-line method over its estimated useful life or the term of the agreement. Also included in other assets is the net deferred tax asset, bank owned life insurance, accrued interest receivable, taxes receivable, rate lock derivatives, and the Company’s equity method investments. The Company performs an impairment analysis on it's equity method investments when events or circumstances indicate impairment potentially exists. Derivatives: The Company records all derivatives on the Consolidated Balance Sheets at fair value. The accounting for change in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate the derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Interest rate swaps that are designated as a cash flow hedge and satisfy the hedge accounting requirements involve the receipt of variable amounts from a counter-party in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. For derivatives which are designed as cash flow hedges and satisfy hedge accounting requirements, the effective portion of changes in the fair value of the derivative is recorded in accumulated other comprehensive income (loss). The ineffective portion of a change in the fair value of the derivative is recognized directly in earnings. The fair value of the Company's derivatives is determined using discounted cash flow analysis sing observable market based inputs. The Company considers all free-standing derivatives not designated in a hedging relationship as economic hedges and recognizes these derivatives as either assets or liabilities in the balance sheet and requires measurement of those instruments at fair value through adjustments to current earnings. By using derivatives, the Company is exposed to counterparty credit risk, which is the risk that counterparties to the derivative contracts do not perform as expected. If a counterparty fails to perform, our counterparty credit risk is equal to the amount reported as a derivative asset on our balance sheet, net of cash collateral received. We minimize counterparty credit risk through credit approvals, limits, monitoring procedures, and obtaining collateral, where appropriate. For derivative instruments executed with the same counterparty under a master netting arrangement, we do not offset fair value amounts of interest rate swaps in liability position with the ones in asset position. For further detail, see Note 18. Transfers or sales of financial assets: For transfers of entire financial assets or a participating interest in an entire financial asset recorded as sales, we recognize and initially measure at fair value all assets obtained and liabilities incurred. We record a gain or loss in noninterest income for the difference between the carrying amount and the fair value of the assets sold. Fair values are based on quoted market prices, quoted market prices for similar assets, or if market prices are not available, then the fair value is estimated using discounted cash flow analysis with assumptions for credit losses, prepayments and discount rates that are corroborated by and verified against market observable data, where possible. Advertising: Advertising, promotion, and marketing costs are expensed as incurred. The Company reported total expenses in these areas of $2.6 million , $2.4 million , and $2.7 million for each of the periods ending December 31, 2017 , 2016 , and 2015 , respectively. Stock Incentive Plans: The Company accounts for its stock incentive plans using a fair-value-based method of accounting for stock-based employee compensation plans. The Company has elected the modified prospective method for recognition of compensation cost associated with stock-based employee compensation awards. The Company amortizes stock-based compensation expense over the vesting period of each award. Income Taxes: The Company uses the asset and liability method of accounting for income taxes. Under the asset and liability method, deferred income taxes are recognized for the future consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date. Our policy is to recognize interest and penalties on unrecognized tax benefits in “Provision for income taxes” in the Consolidated Statements of Income. Earnings Per Share: Earnings per share is calculated using the weighted average number of shares and dilutive common stock equiv

Cash and Due from Banks

Cash and Due from Banks	12 Months Ended
	Dec. 31, 2017
Cash and Due from Banks [Abstract]
Cash and Due from Banks	Cash and Due from Banks The Company is required to maintain a $710,000 minimum average daily balance with the Federal Reserve Bank of San Francisco ("Federal Reserve Bank") for purposes of settling financial transactions and charges for Federal Reserve Bank services. The Company is also required to maintain cash balances or deposits with the Federal Reserve Bank sufficient to meet its statutory reserve requirements. The average reserve requirement for the maintenance period, which included December 31, 2017 , was $0 . The Company is required to maintain a $500,000 balance with a correspondent bank for outsourced servicing of ATMs. The Company is required to maintain a $100,000 and $300,000 balance with a correspondent bank to collateralize the initial margin and the fair value exposure of one of its interest rate swaps, respectively.

Interest Bearing Deposits in Ot

Interest Bearing Deposits in Other Banks	12 Months Ended
	Dec. 31, 2017
Interest Bearing Deposits In Other Banks [Abstract]
Interest Bearing Deposits in Other Banks	Interest Bearing Deposits in Other Banks All interest bearing deposits in other banks have a maturity of one year or less. Balances at December 31 for the respective years are as follows: (In Thousands) 2017 2016 Interest bearing deposits at Federal Reserve Bank $52,083 $15,734 Interest bearing deposits at FHLB 41 31 Other interest bearing deposits at other institutions 701 301 Total $52,825 $16,066

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2017
Marketable Securities [Abstract]
Investment Securities	Investment Securities The carrying values and approximate fair values of investment securities at the periods indicated are presented below: (In Thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value December 31, 2017 Securities available for sale U.S. Treasury and government sponsored entities $250,794 $3 $1,336 $249,461 Municipal securities 14,395 72 46 14,421 Corporate bonds 36,654 478 — 37,132 Collateralized loan obligations 6,000 5 — 6,005 Preferred stock 5,422 338 29 5,731 Total securities available for sale $313,265 $896 $1,411 $312,750 December 31, 2016 Securities available for sale U.S. Treasury and government sponsored entities $264,267 $150 $1,056 $263,361 Municipal securities 18,184 26 53 18,157 U.S. Agency mortgage-backed securities 2 — — 2 Corporate bonds 44,437 295 — 44,732 Preferred stock 4,922 49 4 4,967 Total securities available for sale $331,812 $520 $1,113 $331,219 Securities held to maturity Municipal securities $899 $23 $— $922 Total securities held to maturity $899 $23 $— $922 Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2017 and 2016 , were as follows: Less Than 12 Months More Than 12 Months Total (In Thousands) Fair Unrealized Losses Fair Unrealized Losses Fair Unrealized Losses 2017: Securities Available for Sale U.S. Treasury and government sponsored entities $116,331 $496 $122,605 $840 $238,936 $1,336 Municipal securities 3,994 17 2,298 29 6,292 46 Preferred stock 1,013 29 — — 1,013 29 Total $121,338 $542 $124,903 $869 $246,241 $1,411 2016: Securities Available for Sale U.S. Treasury and government sponsored entities $180,638 $1,051 $489 $5 $181,127 $1,056 Municipal securities 11,533 33 1,786 20 13,319 53 Preferred stock — — 1,038 4 1,038 4 Total $192,171 $1,084 $3,313 $29 $195,484 $1,113 The unrealized losses on investments in government sponsored entities, corporate bonds, municipal securities, and preferred stock in both periods were caused by changes in interest rates. At December 31, 2017 and 2016 , there were 24 and 34 available for sale securities in an unrealized loss position, respectively, that have been in a loss position for less than twelve months. There were 17 and 4 securities with unrealized losses at December 31, 2017 and 2016 , respectively, that have been at a loss position for more than twelve months. The contractual terms of these investments do not permit the issuer to settle the securities at a price less than the amortized cost of the investment. Because it is more likely than not that the Company will hold these investments until a market price recovery or maturity, these investments are not considered other-than-temporarily impaired. At December 31, 2017 and 2016 , $51.6 million and $50.9 million in securities were pledged for deposits and borrowings, respectively. The amortized cost and fair values of debt securities at December 31, 2017 , are distributed by contractual maturity as shown below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Although preferred stock has no stated maturity, it is aggregated in the calculation of weighted average yields presented below in the category of investments that mature in ten years or more. (In Thousands) Amortized Cost Fair Value Weighted Average Yield U.S. Treasury and government sponsored entities Within 1 year $113,087 $112,755 1.08 % 1-5 years $137,707 $136,706 1.63 % Total $250,794 $249,461 1.38 % Corporate bonds Within 1 year $4,500 $4,504 2.10 % 1-5 years 21,704 21,952 2.14 % 5-10 years 10,450 10,676 2.58 % Total $36,654 $37,132 2.26 % Collateralized loan obligations 5-10 years $3,000 $3,000 3.03 % Over 10 years 3,000 3,005 3.09 % Total $6,000 $6,005 3.06 % Preferred stock Over 10 years $5,422 $5,731 6.37 % Total $5,422 $5,731 6.37 % Municipal securities Within 1 year $3,730 $3,728 1.64 % 1-5 years 10,665 10,693 2.66 % Total $14,395 $14,421 2.40 % The proceeds and resulting gains and losses, computed using specific identification, from sales of investment securities for the years ending December 31, 2017 , 2016 , and 2015 , respectively, are as follows: (In Thousands) Proceeds Gross Gains Gross Losses 2017 Available for sale securities $25,006 $14 $3 2016 Available for sale securities $5,785 $12 $23 2015 Available for sale securities $20,522 $271 $— A summary of interest income for the years ending December 31, 2017 , 2016 , and 2015 on available for sale investment securities is as follows: (In Thousands) 2017 2016 2015 U.S. Treasury and government sponsored entities $2,983 $2,661 $2,378 U.S. Agency mortgage-backed securities — 4 25 Other 1,225 948 670 Total taxable interest income $4,208 $3,613 $3,073 Municipal securities $367 $282 $320 Total tax-exempt interest income $367 $282 $320 Total $4,575 $3,895 $3,393

Loans and Credit Quality

Loans and Credit Quality	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loans and Credit Quality	Loans and Credit Quality As part of the on-going monitoring of the credit quality of the Company’s loan portfolio, management tracks certain credit quality indicators including trends in past due and nonaccrual loans, gross and net charge-offs, and movement in loan balances within the risk classifications. The Company utilizes a loan risk grading system called the Asset Quality Rating (“AQR”) system to assign a risk classification to each of its loans. The risk classification is a dual rating system that contemplates both probability of default and risk of loss given default. Loans are graded on a scale of 1 to 10 and, loans graded 1 – 6 are considered “pass” grade loans. A description of the general characteristics of the AQR risk classifications are as follows: Pass grade loans – 1 through 6: The borrower demonstrates sufficient cash flow to fund debt service, including acceptable profit margins, cash flows, liquidity and other balance sheet ratios. Historic and projected performance indicates that the borrower is able to meet obligations under most economic circumstances. The company has competent management with an acceptable track record. The category does not include loans with undue or unwarranted credit risks that constitute identifiable weaknesses. Special Mention – 7: A "special mention" credit has weaknesses that deserve management's close attention. If left uncorrected, these potential weaknesses may result in deterioration of either the repayment prospects for the asset or the Bank's credit position at some future date. Special mention assets are not adversely classified and do not expose the Bank to sufficient risk to warrant adverse classification. Loans are currently protected, but are weak due to negative trends in the balance sheet and income statement. Current cash flow may be insufficient to meet debt service, with prospects that the condition may not be temporary. Profitability and key balance sheet ratios are below peers. There is a lack of effective control over collateral or there are documentation deficiencies as well as a potential risk of payment default. Collateral coverage is minimal in gross dollars or due to quality issues. Financial information may be inadequate to show the recent condition of borrower. The loan would not be approved as a new credit, and new loans would not be granted. Management may not be adequately qualified or may have very limited prior experience with similar activities or markets. The ability of management to cope with current conditions is questionable. Internal conflict and turnover in key positions may be present. Succession is unclear. The borrower's asset quality is below average. The capital base may be insufficient to cover capital losses. Leverage is above average or increasing. The industry outlook is generally negative but there are reasonable expectations of a turnaround within 12-18 months. The firm may be new, resulting in competitive deficiencies in comparison to the older, more established firms in the industry. Over-capacity may be evident in the industry. Collateral and guarantor strength are comparable to Management Attention-6, but agings and certifications of accounts receivable and inventory are required and are not being provided on a regular basis. Substandard – 8: A "substandard" credit is inadequately protected by the current sound worth and paying capacity of the obligor or by the collateral pledged, if any. Assets so classified must have a well-defined weakness, or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected. Loans have well-defined weaknesses where a payment default and/or a loss are possible, but not yet probable. Cash flow is insufficient to service debt, with prospects that the condition is permanent. Assets classified as substandard are inadequately protected by the current net worth and paying capacity of the borrower, and there is a likelihood that collateral will have to be liquidated and/or the guarantor called upon to repay the debt. Generally, the loan is considered collectible as to both principal and interest, primarily because of collateral coverage. Loan(s) may have been restructured at less than market terms or have been partially charged off. If deficiencies are not corrected quickly, there is a probability of loss and the borrower’s ability to operate as a going concern may be deemed questionable/is questionable. Management has no prior experience with similar activities, demonstrating inability to realistically address problems and meet commitments. The borrower’s asset quality is poor. The capital base is weak and insufficient to absorb continuing losses, and leverage is significantly above peers. Liquidity is poor with significant reliance on short-term borrowing to support trade debt. Key balance sheet ratios are substantially inferior to industry norms. The industry is currently trending downward or demonstrating recovery from an adverse cycle. The outlook is generally negative at this time. Timing of recovery is unclear, but expectations are that market conditions will improve within 18 - 24 months. The borrower has substantial competitive deficiencies when compared to other firms, such as excess capacity and over-supply, resulting in frequent and significant concessions and discounting. Business failures are prevalent. Collateral coverage is marginal or non-existent. Collateral may be located outside the borrower’s market area. There are no agings or certifications of accounts receivable and inventory being received from the borrower, and collateral has doubtful marketability/convertibility. If guaranteed, the guarantor has limited outside worth and is highly leveraged with a poor credit report, which may reflect liens, collection problems, or lawsuits. Doubtful – 9: An asset classified "doubtful" has all the weaknesses inherent in one that is classified "substandard-8" with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently known facts, conditions, and values, highly questionable and improbable. The loan has substandard characteristics, and available information suggests that it is unlikely that the loan will be repaid in its entirety. Cash flow is insufficient to service debt. The company has had a series of substantial losses. If the current material adverse trends continue, it is unlikely the borrower will have the ability to meet the terms of the loan agreement. It may be difficult to predict the exact amount of loss, but the probability of some loss is greater than 50% . Loans are to be placed on non-accrual status when any portion is classified as doubtful. Non-accrual loans would not be classified "doubtful" as long as the collateral appears adequate to retire the outstanding balance. Management is clearly unable to address problems and meet commitments, and there is little expectation either of improvement or for sustaining the relationship with current management. The company is highly illiquid with excessive leverage. Key balance sheet ratios are at unacceptable levels, and downturn is severe. Timing of recovery is undeterminable. The company is unable to compete; collateral and guarantees provide limited support. Loss – 10: An asset classified "loss" is considered uncollectable and of such little value that its continuance on the books is not warranted. This classification does not mean that the asset has absolutely no recovery or salvage value, but rather that it is not practical or desirable to defer writing off this basically worthless asset, even though partial recovery may be affected in the future. The loan has doubtful characteristics, but the loan will definitely not be repaid in full. Debt service coverage clearly reflects the company's inability to service debt. The borrower cannot generate sufficient cash flow to cover fixed charges. All near-term and long-term trends concerning cash flow and earnings are negative. The damage to the financial condition of the Company cannot be reversed at this point in time. Collateral and guarantees provide no support. The composition of the loan portfolio as of the periods indicated is as follows: (In Thousands) Commercial Real estate construction one-to-four family Real estate construction other Real estate term owner occupied Real estate term non-owner occupied Real estate term other Consumer secured by 1st deeds of trust Consumer other Total December 31, 2017 AQR Pass $277,626 $31,201 $80,093 $127,115 $307,926 $39,777 $22,103 $19,895 $905,736 AQR Special Mention 4,921 — — 2,095 11,051 634 3 22 18,726 AQR Substandard 31,222 — — 2,888 482 — 767 2 35,361 Subtotal $313,769 $31,201 $80,093 $132,098 $319,459 $40,411 $22,873 $19,919 $959,823 Less: Unearned origination fees, net of origination costs (4,156 ) Total loans $955,667 December 31, 2016 AQR Pass $257,639 $26,061 $72,159 $135,359 $355,903 $44,733 $22,568 $25,151 $939,573 AQR Special Mention 1,950 — — 57 — — 501 78 2,586 AQR Substandard 18,589 — — 16,762 698 669 520 52 37,290 Subtotal $278,178 $26,061 $72,159 $152,178 $356,601 $45,402 $23,589 $25,281 $979,449 Less: Unearned origination fees, net of origination costs (4,434 ) Total loans $975,015 At December 31, 2017 , approximately 71% of the Company’s loans are secured by real estate and 3% are unsecured. Approximately 26% are for general commercial uses, including professional, retail, and small businesses. Repayment is expected from the borrowers’ cash flow or, secondarily, the collateral. The Company’s exposure to credit loss, if any, is the outstanding amount of the loan if the collateral is determined to be of no value. Nonaccrual Loans Nonaccrual loans net of government guarantees totaled $21.2 million and $12.5 million at December 31, 2017 and December 31, 2016 , respectively. Interest income which would have been earned on nonaccrual loans for 2017 , 2016 , and 2015 amounted to $1.4 million , $676,000 , and $276,000 , respectively. Additionally, the Company recognized interest income of $120,000 , $181,000 , and $617,000 in 2017 , 2016 , and 2015 , respectively, related to interest collected on nonaccrual loans whose principal has been paid down to zero. Nonaccrual loans at the periods indicated, by segment are presented below: (In Thousands) 30-59 Days 60-89 Days Greater Than Current Total December 31, 2017 Commercial $810 $— $2,652 $16,455 $19,917 Real estate term owner occupied — — — 1,331 1,331 Consumer secured by 1st deeds of trust — — 378 — 378 Total nonaccrual loans 810 — 3,030 17,786 21,626 Government guarantees on nonaccrual loans — — (94 ) (373 ) (467 ) Net nonaccrual loans $810 $— $2,936 $17,413 $21,159 December 31, 2016 Commercial $8,750 $— $4,208 $542 $13,500 Real estate term owner occupied — — — 29 29 Real estate term non-owner occupied — — — 197 197 Consumer secured by 1st deeds of trust — — 167 — 167 Total nonaccrual loans 8,750 — 4,375 768 13,893 Government guarantees on nonaccrual loans — — (1,413 ) — (1,413 ) Net nonaccrual loans $8,750 $— $2,962 $768 $12,480 Past Due Loans There were $252,000 and $456,000 past due loans greater than 90 days and still accruing interest at December 31, 2017 and 2016 , respectively. Past due loans and nonaccrual loans at the periods indicated are presented below by loan class: (In Thousands) 30-59 Days Past Due Still Accruing 60-89 Days Past Due Still Accruing Greater Than 90 Days Still Accruing Total Past Nonaccrual Current Total December 31, 2017 Commercial $503 $— $240 $743 $19,917 $293,109 $313,769 Real estate construction one-to-four family — — — — — 31,201 31,201 Real estate construction other 90 — — 90 — 80,003 80,093 Real estate term owner occupied 966 — — 966 1,331 129,801 132,098 Real estate term non-owner occupied — — — — — 319,459 319,459 Real estate term other — — — — — 40,411 40,411 Consumer secured by 1st deed of trust 363 — — 363 378 22,132 22,873 Consumer other 161 53 12 226 — 19,693 19,919 Subtotal $2,083 $53 $252 $2,388 $21,626 $935,809 $959,823 Less: Unearned origination fees, net of origination costs (4,156 ) Total $955,667 December 31, 2016 Commercial $— $141 $404 $545 $13,500 $264,133 $278,178 Real estate construction one-to-four family — — — — — 26,061 26,061 Real estate construction other — — — — — 72,159 72,159 Real estate term owner occupied 887 — — 887 29 151,262 152,178 Real estate term non-owner occupied — — — — 197 356,404 356,601 Real estate term other — — — — — 45,402 45,402 Consumer secured by 1st deed of trust 390 518 — 908 167 22,514 23,589 Consumer other 171 80 52 303 — 24,978 25,281 Subtotal $1,448 $739 $456 $2,643 $13,893 $962,913 $979,449 Less: Unearned origination fees, net of origination costs (4,434 ) Total $975,015 Impaired Loans At December 31, 2017 and 2016 , the recorded investment in loans that are considered to be impaired was $32.0 million and $38.7 million , respectively. The following table presents information about impaired loans by class for the years ended December 31, 2017 and 2016 : (In Thousands) Recorded Investment Unpaid Principal Balance Related Allowance December 31, 2017 With no related allowance recorded Commercial - AQR special mention $2,153 $2,153 $— Commercial - AQR substandard 16,671 17,742 — Real estate term owner occupied - AQR substandard 2,862 2,862 — Real estate term non-owner occupied - AQR pass 303 303 — Real estate term non-owner occupied - AQR special mention 89 89 — Real estate term non-owner occupied - AQR substandard 482 482 — Real estate term other - AQR pass 559 559 — Consumer secured by 1st deeds of trust - AQR pass 136 136 — Consumer secured by 1st deeds of trust - AQR substandard 724 809 — Subtotal $23,979 $25,135 $— With an allowance recorded Commercial - AQR substandard $7,988 $7,988 $966 Subtotal $7,988 $7,988 $966 Commercial - AQR special mention $2,153 $2,153 $— Commercial - AQR substandard 24,659 25,730 966 Real estate term owner-occupied - AQR substandard 2,862 2,862 — Real estate term non-owner occupied - AQR pass 303 303 — Real estate term non-owner occupied - AQR special mention 89 89 — Real estate term non-owner occupied - AQR substandard 482 482 — Real estate term other - AQR pass 559 559 — Consumer secured by 1st deeds of trust - AQR pass 136 136 — Consumer secured by 1st deeds of trust - AQR substandard 724 809 — Total $31,967 $33,123 $966 (In Thousands) Recorded Investment Unpaid Principal Balance Related Allowance December 31, 2016 With no related allowance recorded Commercial - AQR special mention $223 $223 $— Commercial - AQR substandard 9,213 9,893 — Real estate term owner occupied - AQR pass 252 252 — Real estate term owner occupied - AQR substandard 16,694 16,694 — Real estate term non-owner occupied - AQR pass 391 391 — Real estate term non-owner occupied - AQR substandard 693 693 — Real estate term other - AQR pass 633 633 — Real estate term other - AQR substandard 669 669 — Consumer secured by 1st deeds of trust - AQR special mention 143 143 — Consumer secured by 1st deeds of trust - AQR substandard 472 488 — Consumer other - AQR substandard 52 52 — Subtotal $29,435 $30,131 $— With an allowance recorded Commercial - AQR substandard $9,221 $9,221 $614 Subtotal $9,221 $9,221 $614 Commercial - AQR special mention $223 $223 $— Commercial - AQR substandard 18,434 19,114 614 Real estate term owner-occupied - AQR pass 252 252 — Real estate term owner-occupied - AQR substandard 16,694 16,694 — Real estate term non-owner occupied - AQR pass 391 391 — Real estate term non-owner occupied - AQR substandard 693 693 — Real estate term other - AQR pass 633 633 — Real estate term other - AQR substandard 669 669 — Consumer secured by 1st deeds of trust - AQR special mention 143 143 — Consumer secured by 1st deeds of trust - AQR substandard 472 488 — Consumer other - AQR substandard 52 52 — Total $38,656 $39,352 $614 The unpaid principal balance included in the table above represents the recorded investment at the dates indicated, plus amounts charged-off for book purposes. The following table summarizes our average recorded investment and interest income recognized on impaired loans for years ended December 31, 2017 and 2016 , respectively: Year Ended December 31, 2017 2016 (In Thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded Commercial - AQR special mention $582 $1 $170 $13 Commercial - AQR substandard 19,521 487 15,522 840 Real estate construction one-to-four family - AQR substandard — — 988 — Real estate construction other - AQR substandard — — 1,431 — Real estate term owner occupied - AQR pass 62 5 378 34 Real estate term owner occupied - AQR substandard 5,402 286 16,551 1,202 Real estate term non-owner occupied - AQR pass 354 43 442 91 Real estate term non-owner occupied - AQR special mention 23 2 — — Real estate term non-owner occupied - AQR substandard 611 45 599 28 Real estate term other - AQR pass 595 42 627 58 Real estate term other - AQR special mention — — 43 4 Real estate term other - AQR substandard 487 34 683 55 Consumer secured by 1st deeds of trust - AQR pass 35 3 38 2 Consumer secured by 1st deeds of trust - AQR special mention 105 10 36 3 Consumer secured by 1st deeds of trust - AQR substandard 561 17 568 24 Consumer other - AQR substandard 13 1 13 — Subtotal $28,351 $976 $38,089 $2,354 With an allowance recorded Commercial - AQR special mention $525 $3 $— $— Commercial - AQR substandard 8,019 4 2,451 $— Real estate construction one-to-four family - AQR substandard — — 1,986 — Consumer secured by 1st deeds of trust - AQR substandard — — 73 — Subtotal $8,544 $7 $4,510 $— Total Commercial - AQR special mention $1,107 $4 $170 $13 Commercial - AQR substandard 27,540 491 17,973 840 Real estate construction one-to-four family - AQR substandard — — 2,974 — Real estate construction other - AQR substandard — — 1,431 — Real estate term owner-occupied - AQR pass 62 5 378 34 Real estate term owner-occupied - AQR substandard 5,402 286 16,551 1,202 Real estate term non-owner occupied - AQR pass 354 43 442 91 Real estate term non-owner occupied - AQR special mention 23 2 — — Real estate term non-owner occupied - AQR substandard 611 45 599 28 Real estate term other - AQR pass 595 42 627 58 Real estate term other - AQR special mention — — 43 4 Real estate term other - AQR substandard 487 34 683 55 Consumer secured by 1st deeds of trust - AQR pass 35 3 38 2 Consumer secured by 1st deeds of trust - AQR special mention 105 10 36 3 Consumer secured by 1st deeds of trust - AQR substandard 561 17 641 24 Consumer other - AQR substandard 13 1 13 — Total Impaired Loans $36,895 $983 $42,599 $2,354 The average recorded investment was $26.0 million , and interest income recognized on impaired loans was $1.1 million for the year ended December 31, 2015. Purchased Credit Impaired Loans The Company acquired eighteen purchased credit impaired loans from Alaska Pacific on April 1, 2014 subject to the requirements of FASB ASC 310-30 Loans and Debt Securities Acquired with Deteriorated Credit Quality . This group of loans consists primarily of commercial and commercial real estate loans, and unlike a pool of consumer mortgages, it is not practicable for the Company to analyze the accretable yield of these loans. As such, the Company has elected the cost recovery method of income recognition for these loans, and thus no accretable difference has been identified for these loans. At the acquisition date, April 1, 2014, the fair value of this group of loans was $3.9 million . The carrying value of these loans as of December 31, 2017 and 2016 were $923,000 and $1.1 million , respectively. Troubled Debt Restructurings Loans classified as troubled debt restructurings (“TDR”) totaled $23.8 million and $16.2 million at December 31, 2017 and December 31, 2016 , respectively. A troubled debt restructuring is a loan to a borrower that is experiencing financial difficulty that has been modified from its original terms and conditions in such a way that the Company is granting the borrower a concession of some kind. The Company has granted a variety of concessions to borrowers in the form of loan modifications. The modifications granted can generally be described in the following categories: Rate Modification : A modification in which the interest rate is changed. Term Modification : A modification in which the maturity date, timing of payments, or frequency of payments is changed. Payment Modification : A modification in which the dollar amount of the payment is changed, or in which a loan is converted to interest only payments for a period of time is included in this category. Combination Modification : Any other type of modification, including the use of multiple categories above. AQR pass graded loans included above in the impaired loan data are loans classified as TDRs. By definition, TDRs are considered impaired loans. All of the Company’s TDRs are included in impaired loans. The following table identifies the portion of TDR balances as of December 31, 2017 that were restructured during 2017 : Accrual Status Nonaccrual Status Total Modifications (In Thousands) New Troubled Debt Restructurings Commercial - AQR special mention $2,059 $— $2,059 Commercial - AQR substandard 202 8,349 8,551 Subtotal $2,261 $8,349 $10,610 Existing Troubled Debt Restructurings 5,407 7,830 13,237 Total $7,668 $16,179 $23,847 The following table provides additional information about loans that were restructured in 2017 : (In Thousands) Number of Contracts Rate Modification Term Modification Payment Modification Combination Modification Total Modifications Pre-Modification Outstanding Recorded Investment: Commercial - AQR special mention 1 $— $2,078 $— $— $2,078 Commercial - AQR substandard 2 — 10,665 210 — 10,875 Total 3 $— $12,743 $210 $— $12,953 Post-Modification Outstanding Recorded Investment: Commercial - AQR special mention 1 $— $2,059 $— $— $2,059 Commercial - AQR substandard 2 — 8,349 202 — 8,551 Total 3 $— $10,408 $202 $— $10,610 The Company had no commitments to extend additional credit to borrowers owing receivables whose terms have been modified in troubled debt restructurings at December 31, 2017 . There were $731,000 charge-offs in 2017 on loans that were later classified as a TDR, and there were no charge-offs in 2016 on loans that were later classified as a TDR in 2016. All TDRs are also classified as impaired loans and are included in the loans individually evaluated for impairment in the calculation of the Allowance. There were two TDRs with specific impairment at December 31, 2017 and four at December 31, 2016 , respectively. There were no loans that were restructured during 2017 , 2016 , and 2015 , respectively, that also subsequently defaulted within the first twelve months of restructure in those same periods. At December 31, 2017 and 2016 , there were no loans pledged as collateral to secure public deposits. Certain directors, and companies of which directors are principal owners, have loans and other transactions such as architectural fees with the Company. Such transactions are made on substantially the same terms, including interest rates and collateral required, as those prevailing for similar transactions of unrelated parties. An analysis of the loan transactions for the years indicated follows: (In Thousands) 2017 2016 Balance, beginning of the year $90 $117 Loans made — — Repayments 90 27 Balance, end of year $— $90 The Company had $15,000 of unfunded loan commitments to these directors or their related interests on December 31, 2017 and 2016 .

Allowance For Loan Losses

Allowance For Loan Losses	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Allowance for Loan Losses	Allowance for Loan Losses The following table details activity in the Allowance for the periods indicated: (In Thousands) Commercial Real estate construction one-to-four family Real estate construction other Real estate term owner occupied Real estate term non-owner occupied Real estate term other Consumer secured by 1st deed of trust Consumer other Unallocated Total 2017 Balance, beginning of period $5,535 $550 $1,465 $2,358 $6,853 $819 $313 $408 $1,396 $19,697 Charge-Offs (1,611 ) — — — — (5 ) (85 ) (43 ) — (1,744 ) Recoveries 293 — — — — 2 2 11 — 308 Provision (benefit) 1,955 79 101 (164 ) (810 ) (91 ) 85 (69 ) 2,114 3,200 Balance, end of period $6,172 $629 $1,566 $2,194 $6,043 $725 $315 $307 $3,510 $21,461 Balance, end of period: Individually evaluated for impairment $966 $— $— $— $— $— $— $— $— $966 Balance, end of period: Collectively evaluated for impairment $5,206 $629 $1,566 $2,194 $6,043 $725 $315 $307 $3,510 $20,495 2016 Balance, beginning of period $5,906 $854 $1,439 $1,657 $5,515 $628 $264 $397 $1,493 $18,153 Charge-Offs (903 ) (535 ) — — — — (36 ) (8 ) — (1,482 ) Recoveries 699 — — — — — — 29 — 728 Provision (benefit) (167 ) 231 26 701 1,338 191 85 (10 ) (97 ) 2,298 Balance, end of period $5,535 $550 $1,465 $2,358 $6,853 $819 $313 $408 $1,396 $19,697 Balance, end of period: Individually evaluated for impairment $614 $— $— $— $— $— $— $— $— $614 Balance, end of period: Collectively evaluated for impairment $4,921 $550 $1,465 $2,358 $6,853 $819 $313 $408 $1,396 $19,083 2015 Balance, beginning of period $5,643 $644 $1,653 $1,580 $4,704 $656 $285 $410 $1,148 $16,723 Charge-Offs (616 ) — — — — (81 ) (28 ) (101 ) — (826 ) Recoveries 379 — — — — 107 3 13 — 502 Provision (benefit) 500 210 (214 ) 77 811 (54 ) 4 75 345 1,754 Balance, end of period $5,906 $854 $1,439 $1,657 $5,515 $628 $264 $397 $1,493 $18,153 Balance, end of period: Individually evaluated for impairment $344 $— $— $— $— $— $— $— $— $344 Balance, end of period: Collectively evaluated for impairment $5,562 $854 $1,439 $1,657 $5,515 $628 $264 $397 $1,493 $17,809 The following is a detail of the recorded investment in the loan portfolio, segregated by amounts evaluated individually or collectively in the Allowance at the periods indicated: (In Thousands) Commercial Real estate construction one-to-four family Real estate construction other Real estate term owner occupied Real estate term non-owner occupied Real estate term other Consumer secured by 1st deed of trust Consumer other Total December 31, 2017 Balance, end of period $313,769 $31,201 $80,093 $132,098 $319,459 $40,411 $22,873 $19,919 $959,823 Balance, end of period: Individually evaluated for impairment $26,812 $— $— $2,862 $874 $559 $860 $— $31,967 Balance, end of period: Collectively evaluated for impairment $286,957 $31,201 $80,093 $129,236 $318,585 $39,852 $22,013 $19,919 $927,856 December 31, 2016 Balance, end of period $278,178 $26,061 $72,159 $152,178 $356,601 $45,402 $23,589 $25,281 $979,449 Balance, end of period: Individually evaluated for impairment $18,657 $— $— $16,946 $1,084 $1,302 $615 $52 $38,656 Balance, end of period: Collectively evaluated for impairment $259,521 $26,061 $72,159 $135,232 $355,517 $44,100 $22,974 $25,229 $940,793 The following represents the balance of the Allowance for the periods indicated segregated by segment and class: (In Thousands) Total Commercial Real estate construction 1-4 family Real estate construction other Real estate term owner occupied Real estate term non-owner occupied Real estate term other Consumer secured by 1st deeds of trust Consumer other Unallocated December 31, 2017 Individually evaluated for impairment AQR Substandard $966 $966 $— $— $— $— $— $— $— $— Collectively evaluated for impairment: AQR Pass 16,453 5,079 629 1,566 2,154 5,680 725 315 305 — AQR Special Mention 524 120 — — 40 363 — — 1 — AQR Substandard 8 7 — — — — — — 1 — Unallocated 3,510 — — — — — — — — 3,510 $21,461 $6,172 $629 $1,566 $2,194 $6,043 $725 $315 $307 $3,510 December 31, 2016 Individually evaluated for impairment: AQR Substandard $614 $614 $— $— $— $— $— $— $— $— Collectively evaluated for impairment: AQR Pass 17,628 4,867 550 1,465 2,358 6,853 819 310 406 — AQR Special Mention 56 51 — — — — — 3 2 — AQR Substandard 3 3 — — — — — — — — Unallocated 1,396 — — — — — — — — 1,396 $19,697 $5,535 $550 $1,465 $2,358 $6,853 $819 $313 $408 $1,396

Purchased Receivables

Purchased Receivables	12 Months Ended
	Dec. 31, 2017
Purchased Receivables [Abstract]
Purchased Receivables	Purchased Receivables We purchase accounts receivable from our business customers and provide them with short-term working capital. We provide this service to our customers in Alaska and in Washington and the greater west coast through NFS. Our purchased receivable activity is guided by policies that outline risk management, documentation, and approval limits. The policies are reviewed and approved annually by the Board of Directors. Purchased receivables are carried at their principal amount outstanding, net of a reserve for anticipated losses that have not yet been identified, and have a maturity of less than one year. Purchased receivable balances are charged against this reserve when management believes that collection of principal is unlikely. Management evaluates the adequacy of the reserve for purchased receivable losses based on historical loss experience by segment and class of receivable and its assessment of current economic conditions. As of December 31, 2017 , the Company has one segment and class of purchased receivables. There are no purchased receivables past due at December 31, 2017 or 2016 , respectively, and there were no restructured purchased receivables in 2017 , 2016 , or 2015 . Income on purchased receivables is accrued and recognized on the balance outstanding using an effective interest method, except when management believes doubt exists as to the collectability of the income or principal. As of December 31, 2017 , the Company is accruing income on all purchased receivable balances outstanding. The following table summarizes the components of net purchased receivables at December 31, for the years indicated: (In Thousands) 2017 2016 Purchased receivables $22,431 $20,662 Reserve for purchased receivable losses (200 ) (171 ) Total $22,231 $20,491 The following table sets forth information regarding changes in the purchased receivable reserve for the periods indicated: (In Thousands) 2017 2016 2015 Balance at beginning of year $171 $181 $289 Charge-offs — — — Recoveries — — 30 Net recoveries (charge-offs) — — 30 Reserve for (recovery from) purchased receivables 29 (10 ) (138 ) Balance at end of year $200 $171 $181 The Company recorded no charge-offs in 2017, 2016, and 2015.

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2017
Real Estate [Abstract]
Other Real Estate Owned	Other Real Estate Owned At December 31, 2017 and 2016 , the Company held $8.7 million and $6.6 million , respectively, as OREO. The following table details net operating expense related to OREO for the years indicated: Years Ended December 31, (In Thousands) 2017 2016 2015 OREO (income) expense, net rental income and gains on sale: OREO operating expense $420 $304 $224 Impairment on OREO 904 187 361 Rental income on OREO (116 ) (98 ) (80 ) Gains on sale of OREO (371 ) (295 ) (315 ) Total $837 $98 $190

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment The following summarizes the components of premises and equipment at December 31 for the years indicated: (In Thousands) Useful Life 2017 2016 Land $2,562 $2,596 Furniture and equipment 3-7 years 8,323 14,912 Tenant improvements 2-15 years 8,323 8,325 Buildings 39 years 38,114 37,683 Total Premises and Equipment 57,322 63,516 Accumulated depreciation and amortization (19,455 ) (24,198 ) Total Premises and Equipment, Net $37,867 $39,318 Depreciation expense and amortization of leasehold improvements was $2.9 million , $2.4 million , and $2.3 million for the years ended December 31, 2017 , 2016 , and 2015 , respectively. Related Party Transactions: The Company made no payments to related parties in the years ended December 31, 2017 and 2016.

Mortgage Servicing Rights

Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2017
Transfers and Servicing [Abstract]
Mortgage Servicing Rights	Mortgage Servicing Rights The following table details the activity in the Company's mortgage servicing rights ("MSR") for the year indicated: (In Thousands) 2017 2016 Balance, beginning of period $4,157 $1,654 Additions for new MSR capitalized 3,146 3,029 Changes in fair value: Due to changes in model inputs of assumptions (1) 551 (214 ) Other (2) (549 ) (312 ) Carrying value, December 31 $7,305 $4,157 (1) Principally reflects changes in discount rates and prepayment speed assumptions, which are primarily affected by changes in interest rates. (2) Represents changes due to collection/realization of expected cash flows over time. The following table details information related to our serviced mortgage loan portfolio as of December 31, 2017 and 2016: (In Thousands) December 31, 2017 December 31, 2016 Balance of mortgage loans serviced for others $406,291 $272,442 MSR as a percentage of serviced loans 1.80 % 1.53 % The Company recognized servicing fees of $1.3 million , $675,000 , and $261,000 during 2017, 2016, and 2015, respectively, which includes revenues recognized at origination of new mortgage servicing rights, late fees, and ancillary fees as a component of other noninterest income in the Company's Consolidated Statements of Income. The following table outlines the key assumptions used in measuring the fair value of mortgage servicing rights as of December 31, 2017 and 2016: 2017 2016 Constant prepayment rate 9.00 % 11.58 % Discount rate 9.45 % 9.25 %

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets A summary of goodwill and intangible assets at December 31, 2017 and 2016, is as follows: (In Thousands) 2017 2016 Intangible assets: Goodwill $15,017 $15,017 Core deposit intangible 257 357 Trade name intangible 950 950 Total $16,224 $16,324 Goodwill and Other Intangible Assets: In 2007, the Company recorded $1.8 million of goodwill and $1.3 million of core deposit intangible ("CDI") as part of the acquisition of Alaska First Bank & Trust, N.A. (“Alaska First”) stock. The Company amortized the CDI related to the Alaska First acquisition over its estimated useful life. On April 1, 2014, the Company recorded $623,000 of CDI as part of the acquisition of Alaska Pacific. The Company is amortizing the CDI related to the Alaska Pacific acquisition over its estimated useful life of ten years using an accelerated method. Accumulated amortization related to the Alaska Pacific CDI was $365,000 , $283,000 and $190,000 at December 31, 2017 , 2016 , and 2015 , respectively. Lastly, on December 1, 2014 the Company recorded goodwill and a trade name intangible as part of the acquisition of RML. As of December 31, 2017 and 2016, the Company has $7.5 million of goodwill and $950,000 of trade name intangible recorded related to this transaction. Refer to Note 1 for discussion of the change in the balance of goodwill in 2016 related to this acquisition. These assets have indefinite useful lives and are not amortized. The Company performed its annual goodwill impairment testing at December 31, 2017 and 2016 in accordance with the policy described in Note 1 to the financial statements. At December 31, 2017, the Company performed its annual impairment test using the first step of the comprehensive impairment analysis. The Company estimated the fair value of the Company using four valuation methodologies including a comparable transactions approach, a control premium approach, a public market peers approach, and a discounted cash flow approach. We then compared the estimated fair value of the Company to the carrying value as of October 31, 2017 and concluded that no potential impairment existed at that time. Management also reviewed the activity between November 1, 2017 and December 31, 2017, noting no indications of impairment during that period. The Company recorded amortization expense of its intangible assets of $100,000 , $135,000 , and $258,000 for the years ended December 31, 2017 , 2016 , and 2015 , respectively. Accumulated amortization for intangible assets was $6.9 million and $6.8 million at December 31, 2017 and 2016 , respectively. The future amortization expense required on these assets is as follows: (In Thousands) 2018 $71 2019 59 2020 48 2021 37 2022 25 Thereafter 17 Total $257

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	Other Assets A summary of other assets as of December 31, 2017 and 2016, is as follows: (In Thousands) 2017 2016 Other assets: Investment in Low Income Housing Partnerships $21,908 $24,174 Deferred taxes, net 6,260 10,264 Taxes receivable 5,331 1,755 Bank owned life insurance 5,313 6,181 Software 5,270 219 Accrued interest receivable 4,385 3,734 Investment in equity method investments 3,878 4,560 Prepaid expenses 1,269 1,596 Rate lock derivative 873 1,137 Other assets 1,654 2,508 Total $56,141 $56,128 Equity Method Investments: The Company applies the equity method of accounting for the following related entities: • The Company owns a 24% interest in PWA, an investment advisory, trust, and wealth management business located in Seattle, Washington. • The Company owns a 30% interest in Homestate Mortgage Company, LLC, a mortgage origination business located in Anchorage, Alaska. Low Income Housing Partnerships: The following table shows the Company's commitments to invest in various low income housing tax credit partnerships. The Company earns a return on its investments in the form of tax credits and deductions that flow through to it as a limited partner in these partnerships. The Company recognized amortization expense of $2.3 million , $2.9 million , and $2.7 million in 2017 , 2016 , and 2015 , respectively. The Company expects to fund its remaining $5.5 million in commitments on these investments through 2030. (In Thousands) Date of original commitment Years over which tax credits are earned Original commitment amount Less: life to date contributions Remaining commitment amount R4 - MVV May 2014 17 $8,528 ($8,248 ) $280 R4 - Coronado March 2013 17 10,729 (10,138 ) 591 R4 - PJ33 June 2016 17 6,809 (2,184 ) 4,625 WNC December 2012 16 2,500 (2,500 ) — USA 57 December 2006 15 3,000 (3,000 ) — Centerline XXXIII September 2006 18 3,000 (3,000 ) — Centerline XXII January 2003 18 3,000 (3,000 ) — Total $37,566 ($32,070 ) $5,496

Deposits

Deposits	12 Months Ended
	Dec. 31, 2017
Deposits [Abstract]
Deposits	Deposits Deposits: At December 31, 2017 , the scheduled maturities of certificates of deposit are as follows: (In Thousands) 2018 $66,013 2019 19,462 2020 12,008 2021 353 2022 806 Thereafter 1,885 Total $100,527 The Company is a member of the Certificate of Deposit Account Registry System (“CDARS”) which is a network of over 3,000 banks throughout the United States. The CDARS system was founded in 2003 and allows participating banks to exchange FDIC insurance coverage so that 100% of the balance of their customers’ certificates of deposit are fully subject to FDIC insurance. The system also allows for investment of banks’ own investment dollars in the form of domestic certificates of deposit. The Company had no CDARS certificates of deposits at December 31, 2017 or 2016 . At December 31, 2017 and 2016 , the Company did not hold any certificates of deposit from a public entity collateralized by letters of credit issued by the FHLB. At December 31, 2017 and 2016 , the Company did not have any securities pledged to collateralize certificates of deposit from a public entity. At December 31, 2017 and 2016 , the Company held $2.5 million , in deposits for related parties, including directors, executive officers, and their affiliates. Interest expense: Interest expense on deposits is presented below: (In Thousands) 2017 2016 2015 Interest-bearing demand accounts $21 $67 $63 Money market accounts 472 418 404 Savings accounts 520 489 470 Certificates of deposit $100,000 and greater 358 707 754 Certificates of deposit less than $100,000 336 189 248 Total $1,707 $1,870 $1,939

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Borrowings	Borrowings The Company has a maximum line of credit with the FHLB approximating 35% of eligible assets. FHLB advances are subject to collateral criteria that require the Company to pledge assets under a blanket pledge arrangement as collateral for its borrowings from the FHLB. Based on assets currently pledged and advances currently outstanding at December 31, 2017, the Company's available borrowing line is $147.7 million , representing approximately 10% of total assets. Additional advances of up to 35% of eligible assets, or $531.7 million , are dependent on the availability of acceptable collateral such as marketable securities or real estate loans, although all FHLB advances are secured by a blanket pledge of the Company’s assets. The Company has outstanding FHLB advances of $7.4 million and $4.3 million as of December 31, 2017 and 2016, respectively, which were originated to match fund low income housing projects that qualify for long-term fixed interest rates. The first advance was a $2.2 million FHLB Community Investment Program advance which was originated on March 22, 2013. It has an 18 year term with a 30 year amortization period, which mirrors the term of the term real estate loan made to the borrower, and a fixed rate of 3.12% . The second advance was a $2.3 million FHLB Community Investment Cash Advance Program advance that was originated in the second quarter of 2016. This advance has a 20 year term with a 30 year amortization period, which mirrors the term of the loan made to the borrower, and a fixed interest rate of 2.61% . The last advance was a $3.1 million FHLB Community Investment Cash Advance Program advance that was originated in the third quarter of 2017. This advance has a 20 year term with a 30 year amortization period and a fixed interest rate of 3.25% , which mirrors the term of the loan made to the borrower. All of these FHLB advances are included in borrowings. The Federal Reserve Bank is holding $73.6 million of loans as collateral to secure available borrowing lines through the discount window of $43.9 million at December 31, 2017 . There were no discount window advances outstanding at December 31, 2017 and 2016 . The Company paid less than $1,000 in interest in 2017 and 2016 on this agreement. The Company is subject to provisions under the laws in the State of Alaska which, subject to certain exceptions, limit the amount of the Bank's outstanding debt to 15% of total assets or $225.8 million and $227.4 million at December 31, 2017 and 2016, respectively. Securities sold under agreements to repurchase were $27.7 million and $27.6 million , respectively, for December 31, 2017 and 2016 . The Company was paying an average rate of 0.14% and 0.11% on these agreements at December 31, 2017 and 2016 , respectively. The average balance outstanding of securities sold under agreement to repurchase during 2017 and 2016 was $29.0 million and $27.2 million , respectively, and the maximum outstanding at any month-end was $32.6 million and $30.5 million , respectively, during the same time periods. The securities sold under agreement to repurchase are held by the FHLB under the Company’s control. The future principal payments that are required on the Company’s borrowings as of December 31, 2017 , are as follows: (In Thousands) 2018 $27,867 2019 167 2020 173 2021 178 2022 184 Thereafter 6,539 Total $35,108 The Company recognized interest expense of $207,000 , $157,000 , and $469,000 in 2017 , 2016 , and 2015 , respectively. The average interest rates paid on long-term debt in the same periods was 3.23% , 2.82% , and 2.52% , respectively.

Junior Subordinated Debentures

Junior Subordinated Debentures	12 Months Ended
	Dec. 31, 2017
Junior Subordinated Notes [Abstract]
Junior Subordinated Debentures	Junior Subordinated Debentures In May of 2003, the Company formed a wholly-owned Delaware statutory business trust subsidiary, Northrim Capital Trust 1 (the “Trust”), which issued $8 million of guaranteed undivided beneficial interests in the Company’s Junior Subordinated Deferrable Interest Debentures (“Trust Preferred Securities”). These debentures qualified as Tier 1 capital under Federal Reserve Board guidelines. All of the common securities of the Trust were owned by the Company. The proceeds from the issuance of the common securities and the Trust Preferred Securities were used by the Trust to purchase $8.2 million of junior subordinated debentures of the Company. The Trust was not consolidated in the Company’s financial statements in accordance with GAAP; therefore, the Company recorded its investment in the Trust as another asset and the subordinated debentures as a liability. The debentures, which represent the sole asset of the Trust, accrued and paid distributions quarterly at a variable rate of 90 -day LIBOR plus 3.15% per annum, adjusted quarterly, of the stated liquidation value of $1,000 per capital security. The interest cost to the Company on these debentures was $219,000 , $319,000 , and $289,000 in 2017 , 2016 , and 2015 , respectively. The Company entered into contractual arrangements which, taken collectively, fully and unconditionally guaranteed payment of: (i) accrued and unpaid distributions required to be paid on the Trust Preferred Securities; (ii) the redemption price with respect to any Trust Preferred Securities called for redemption by the Trust; and (iii) payments due upon a voluntary or involuntary dissolution, winding up or liquidation of the Trust. The Trust Preferred Securities were mandatorily redeemable upon maturity of the debentures on May 15, 2033 , or upon earlier redemption as provided in the indenture. The Company redeemed the debentures purchased by the Trust in whole, on August 15, 2017 . As specified in the indenture, the redemption price was the principal amount and all accrued but unpaid interest. In December of 2005, the Company formed a wholly-owned Connecticut statutory business trust subsidiary, Northrim Statutory Trust 2 (the “Trust 2”), which issued $10 million of guaranteed undivided beneficial interests in the Company’s Junior Subordinated Deferrable Interest Debentures (“Trust Preferred Securities 2”). These debentures qualify as Tier 1 capital under Federal Reserve Board guidelines. All of the common securities of Trust 2 are owned by the Company. The proceeds from the issuance of the common securities and the Trust Preferred Securities 2 were used by Trust 2 to purchase $10.3 million of junior subordinated debentures of the Company. Trust 2 is not consolidated in the Company’s financial statements in accordance with GAAP; therefore, the Company has recorded its investment in Trust 2 as an other asset and the subordinated debentures as a liability. The debentures, which represent the sole asset of Trust 2, accrue and pay distributions quarterly at a variable rate of 90 -day LIBOR plus 1.37% per annum, adjusted quarterly, of the stated liquidation value of $1,000 per capital security. The interest rate on these debentures was 2.96% at December 31, 2017 . The interest cost to the Company on these debentures was $268,000 , $215,000 , and $174,000 in 2017 , 2016 , and 2015 , respectively. The Company has entered into contractual arrangements which, taken collectively, fully and unconditionally guarantee payment of: (i) accrued and unpaid distributions required to be paid on the Trust Preferred Securities 2; (ii) the redemption price with respect to any Trust Preferred Securities 2 called for redemption by Trust 2; and (iii) payments due upon a voluntary or involuntary dissolution, winding up or liquidation of Trust 2. The Trust Preferred Securities 2 are mandatorily redeemable upon maturity of the debentures on March 15, 2036 , or upon earlier redemption as provided in the indenture. The Company has the right to redeem the debentures purchased by Trust 2 in whole or in part, on or after March 15, 2011 . As specified in the indenture, if the debentures are redeemed prior to maturity, the redemption price will be the principal amount and any accrued but unpaid interest.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans Employees of Northrim Bank are eligible to participate in the Bank's 401(k) plan. Bank employees may elect to have a portion of their salary contributed to the 401(k) plan in accordance with Section 401(k) of the Internal Revenue Code of 1986. Bank employees may participate in the plan if they work more than 1,000 hours per year. Under the plan, each eligible participant may contribute a percentage of their eligible salary to a maximum established by the IRS, and Northrim Bank provides for a mandatory $0.25 match for each $1.00 contributed by an employee up to 6% of the employee’s salary. Northrim Bank may increase the matching contribution at the discretion of the Board of Directors. The plan also allows Northrim Bank to make a discretionary contribution on behalf of eligible employees based on their length of service to Northrim Bank. Northrim Bank expensed $904,000 , $841,000 , and $759,000 , in 2017 , 2016 , and 2015 , respectively, for 401(k) contributions and included these expenses in "Salaries and other personal expense" in the Consolidated Statements of Income. Employees of RML may participate in RML's 401(k) plan. Participation in the plan is available to RML employees who have completed three months of service with the Company and have attained the age of 20 1/2. RML expensed $164,000 , $190,000 , and $172,000 in 2017, 2016, and 2015, respectively, for 401(k) contributions and included this expense in "Salaries and other personal expense" in the Consolidated Statements of Income. On July 1, 1994, Northrim Bank implemented a Supplemental Executive Retirement Plan for executive officers of Northrim Bank whose retirement benefits under the 401(k) plan have been limited under provisions of the Internal Revenue Code. Contributions to this plan totaled $264,000 , $299,000 , and $228,000 , in 2017 , 2016 , and 2015 , respectively. These expenses are included in "Salaries and other personnel expense" in the Consolidated Statements of Income. At December 31, 2017 and 2016 , the balance of the accrued liability for this plan was included in "Other liabilities" and totaled $2.3 million and $2.6 million , respectively. RML has established a Supplemental Executive Retirement Plan ("SERP"), under which RML has agreed to make payment to certain key executives, based on contributions made by RML to the plan and a variable rate of return. The SERP's assets primarily consist of the cash surrender value of life insurance policies. Contributions and earnings made to the participant accounts to the SERP are vested over ten years. The Company recorded expenses of $600,000 , $673,000 , and $692,000 in 2017, 2016, and 2015, respectively. RML's recorded obligation under the SERP amounted to $3.3 million and $2.9 million at December 31, 2017 and 2016, respectively, and was included in "Other liabilities". In February of 2002, Northrim Bank implemented a non-qualified deferred compensation plan in which certain of the executive officers participate. Northrim Bank's net liability under this plan is dependent upon market gains and losses on assets held in the plan. Northrim Bank recognized a decrease in its liability of $140,000 in 2017, an increase in its liability of $199,000 in 2016, and an increase in its liability of $99,000 in 2015. These changes are included in "Salaries and other personnel expense" in the Consolidated Statements of Income. At December 31, 2017 and 2016 , the balance of the accrued liability for this plan was included in "Other liabilities" and totaled $1.5 million and $1.6 million , respectively. In November of 2011, Northrim Bank implemented a Profit Sharing Plan. Executive officers, in addition to all employees of Northrim Bank who commenced employment prior to the January 1 that precedes or coincides with a performance period, are eligible to participate in payments made from a profit sharing pool calculated in accordance with the provisions of the Profit Sharing Plan. The aggregate amount to be paid to employees under the Profit Sharing Plan is determined using performance goals that are established by the Compensation Committee of the Board. If the performance goals are met for the year, the profit sharing pool for the period is calculated based on a formula that is also approved by the Compensation Committee each year. The Compensation Committee approved management’s recommendation based upon the calculated payout under the Profit Sharing Plan’s methodology resulting in aggregate payouts of $1.2 million, $1.1 million, and $1.2 million for 2017 , 2016 , and 2015 , respectively. Information concerning the calculation of employee payments under the Profit Sharing Plan is set forth under the heading “Performance Based Annual Payment” in the Company’s definitive proxy statement for the 2018 Annual Shareholders’ Meeting and is incorporated into this report by reference.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Leases: Rental expense under leases for equipment and premises was $2.9 million, $2.8 million, and $2.8 million in 2017 , 2016 , and 2015 , respectively. The Company's required minimum rental payments on non-cancelable leases as of December 31, 2017 , are as follows: (In Thousands) 2018 $2,737 2019 2,313 2020 2,021 2021 1,967 2022 1,795 Thereafter 9,354 Total $20,187 Rental income under leases was $532,000 , $424,000 and $447,000 in 2017 , 2016 , and 2015 , respectively. The Company's future required minimum rental receipts on non-cancelable leases as of December 31, 2017 , are as follows: (In Thousands) 2018 $657 2019 672 2020 686 2021 521 2022 166 Thereafter — Total $2,702 Employee benefit plans: The Company is self-insured for medical, dental, and vision plan benefits provided to employees. The Company has obtained stop-loss insurance to limit total medical claims in any one year to $175,000 per covered individual. The Company has established a liability for outstanding incurred but unreported claims. While management uses what it believes are pertinent factors in estimating the liability, it is subject to change due to claim experience, type of claims, and rising medical costs. Legal proceeding: The Company from time to time may be involved with disputes, claims, and litigation related to the conduct of its banking business. In the opinion of management, the resolution of these matters will not have a material effect on the Company’s financial position, results of operations, or cash flows. Financial Instruments with Off-Balance Sheet Risk: In the ordinary course of business, the Company enters into various types of transactions that involve financial instruments with off-balance sheet risk. These instruments include commitments to extend credit and standby letters of credit and are not reflected in the accompanying balance sheets. These transactions may involve to varying degrees credit and interest rate risk in excess of the amount, if any, recognized in the balance sheets. Certain commitments are collateralized. We apply the same credit standards to these commitments as in all of our lending activities and include these commitments in our lending risk evaluations. Management does not anticipate any loss as a result of these commitments. The Company’s off-balance sheet credit risk exposure is the contractual amount of commitments to extend credit and standby letters of credit. The Company applies the same credit standards to these contracts as it uses in its lending process. (In Thousands) 2017 2016 Off-balance sheet commitments: Commitments to extend credit $283,937 $236,624 Commitments to originate loans held for sale $43,602 $62,421 Standby letters of credit $7,606 $9,931 Commitments to extend credit are agreements to lend to customers. These commitments have specified interest rates and generally have fixed expiration dates but may be terminated by the Company if certain conditions of the contract are violated. Our exposure to credit loss under commitments to extend credit is represented by the amount of these commitments. Although currently subject to draw down, many of the commitments do not necessarily represent future cash requirements. Collateral held relating to these commitments varies, but generally includes real estate, inventory, accounts receivable, and equipment. Mortgage loans sold to investors may be sold with servicing rights released, for which the Company makes only standard legal representations and warranties as to meeting certain underwriting and collateral documentation standards. In the past two years, the Company has had to repurchase one loan due to deficiencies in underwriting or loan documentation and has not realized significant losses related to these repurchases. Management believes that any liabilities that may result from such recourse provisions are not significant. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. Credit risk arises in these transactions from the possibility that a customer may not be able to repay the Company upon default of performance. Collateral held for standby letters of credit is based on an individual evaluation of each customer’s creditworthiness. Total unfunded commitments were $335.1 million and $309.0 million at December 31, 2017 and 2016 , respectively. The Company does not expect that all of these commitments are likely to be fully drawn upon at any one time. The Company has a reserve for losses related to these commitments and letters of credit that is recorded in "Other liabilities" on the Consolidated Balance Sheets. The reserve was $152,000 and $122,000 as of December 31, 2017 and 2016 , respectively. Capital Expenditures and Commitments: At December 31, 2017, the Company has capital commitments of $47,000 related to the planned improvements to the Company’s corporate office building and design for a new branch. The Company expects these capital expenditures to be incurred in 2018. There were no other material changes outside of the ordinary course of business to any of our material contractual obligations during 2017.

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives Interest rate swaps related to community banking activities The Company enters into interest rate swaps with commercial banking customers which are offset with a corresponding swap agreement with a third party financial institution (“counterparty”). The Company has agreements with its counterparties that contain provisions that provide that if the Company fails to maintain its status as a well-capitalized institution, then the counterparty could terminate the derivative positions and the Company would be required to settle its obligations under the agreements. These agreements also require that the Company and the counterparty collateralize any fair value shortfalls that exceed $250,000 with eligible collateral, which includes cash and securities backed with the full faith and credit of the federal government. Similarly, the Company could be required to settle its obligations under the agreement if specific regulatory events occur, such as if the Company were issued a prompt corrective action directive or a cease and desist order, or if certain regulatory ratios fall below specified levels. The Company pledged $300,000 and $301,000 in available for sale securities to collateralize fair value shortfalls on interest rate swap agreements as of December 31, 2017 and 2016, respectively. The Company had interest rate swaps with an aggregate notional amount of $12.5 million and $18.9 million at December 31, 2017 and December 31, 2016 , respectively. At December 31, 2017 , the notional amount of interest rate swaps is made up of one variable to fixed rate swap to commercial loan customers totaling $6.3 million , and one fixed to variable rate swap with a counterparty totaling $6.3 million . Changes in fair value from these four interest rate swaps offset each other in 2017 and 2016 . The Company recognized $26,000 in fee income related to interest rate swaps in 2017 and did not recognize any fee income in 2016 or 2015 . Interest rate swap income is recorded in "Other income" on the Consolidated Statements of Income. None of these interest rate swaps are designated as hedging instruments. The Company entered into an interest rate swap in the third quarter of 2017 to hedge the variability in cash flows arising out of its junior subordinated debentures, which is floating rate debt, by swapping the cash flows with an interest rate swap which receives floating and pays fixed. The Company has designated this interest rate swap as a hedging instrument. The interest rate swap effectively fixes the Company's interest payments on the $10.0 million of junior subordinated debentures held under Northrim Statutory Trust 2 at 3.72% through its maturity date. The floating rate that the dealer pays is equal to the three month LIBOR plus 1.37% , which reprices quarterly on the payment date. This rate was 2.96% as of December 31, 2017. The Company pledged $400,000 in cash to collateralize initial margin and fair value exposure of our counterparty on this interest rate swap as of December 31, 2017. Changes in the fair value of this interest rate swap are reported in other comprehensive income. The unrealized gain on this interest rate swap was $184,000 as of December 31, 2017. Interest rate swaps related to home mortgage lending activities The Company also uses derivatives to hedge the risk of changes in the fair values of interest rate lock commitments. The Company enters into commitments to originate residential mortgage loans at specific rates; the value of these commitments are detailed in the table below as "interest rate lock commitments". The Company also hedges the interest rate risk associated with its residential mortgage loan commitments, which are referred to as "retail interest rate contracts" in the table below. Market risk with respect to commitments to originate loans arises from changes in the value of contractual positions due to changes in interest rates. At December 31, 2017 and 2016, RML had commitments to originate mortgage loans held for sale totaling $43.6 million and $62.4 million , respectively. Changes in the value of RML's interest rate derivatives are recorded in "Mortgage banking income" on the Consolidated Statements of Income. None of these home mortgage lending derivatives are designated as hedging instruments. The following table presents the fair value of derivatives not designated as hedging instruments at December 31, 2017 and December 31, 2016 : (In Thousands) Asset Derivatives December 31, 2017 December 31, 2016 Balance Sheet Location Fair Value Fair Value Interest rate swaps Other assets $77 $71 Interest rate lock commitments Other assets 873 1,137 Total $950 $1,208 (In Thousands) Liability Derivatives December 31, 2017 December 31, 2016 Balance Sheet Location Fair Value Fair Value Interest rate swaps Other liabilities $77 $71 Retail interest rate contracts Other liabilities — 78 Total $77 $149 The following table presents the losses of derivatives not designated as hedging instruments at December 31, 2017 and 2016: (In Thousands) Income Statement Location December 31, 2017 December 31, 2016 Interest rate contracts Mortgage banking income ($420 ) ($530 ) Interest rate lock commitments Mortgage banking income (229 ) (367 ) Total ($649 ) ($897 ) Our derivative transactions with counterparties under International Swaps and Derivative Association master agreements that include “right of set-off” provisions. “Right of set-off” provisions are legally enforceable rights to offset recognized amounts and there may be an intention to settle such amounts on a net basis. We do not offset such financial instruments for financial reporting purposes. The following table summarizes the derivatives that have a right of offset as of December 31, 2017 and 2016: December 31, 2017 Gross amounts not offset in the Statement of Financial Position (In Thousands) Gross amounts of recognized assets and liabilities Gross amounts offset in the Statement of Financial Position Net amounts of assets and liabilities presented in the Statement of Financial Position Financial Instruments Collateral Posted Net Amount Asset Derivatives Interest rate swaps $77 $— $77 $— $— $77 Liability Derivatives Interest rate swaps $77 $— $77 $— $77 $— December 31, 2016 Gross amounts not offset in the Statement of Financial Position (In Thousands) Gross amounts of recognized assets and liabilities Gross amounts offset in the Statement of Financial Position Net amounts of assets and liabilities presented in the Statement of Financial Position Financial Instruments Collateral Posted Net Amount Asset Derivatives Interest rate swaps $71 $— $71 $— $— $71 Liability Derivatives Interest rate swaps $71 $— $71 $— $71 $— Retail interest rate contracts 78 — 78 — — 78

Common Stock

Common Stock	12 Months Ended
	Dec. 31, 2017
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock	Common Stock Quarterly cash dividends were paid aggregating to $6.0 million , $5.4 million , and $5.1 million , or $0.86 per share, $0.78 per share, and $0.74 per share, in 2017 , 2016 , and 2015 , respectively. On February 22, 2018 , the Board of Directors declared a $0.24 per share cash dividend payable on March 16, 2018 , to shareholders of record on March 8, 2018 . Federal and State regulations place certain limitations on the payment of dividends by the Company. In September 2002, the Company’s Board of Directors approved a plan whereby it would periodically repurchase for cash up to approximately 5% of its shares of common stock in the open market. At December, 31, 2017 , there are 168,901 shares available under the stock repurchase program. The Company intends to continue to repurchase its stock from time to time depending upon market conditions. The Company can make no assurances that it will continue this program or that it will repurchase all of the authorized shares. During 2017, 58,341 shares were repurchased and no repurchases occurred in 2016 .

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company adopted the 2017 Stock Option Plan (“2017 Plan”) following shareholder approval of the 2017 Plan at the 2017 Annual Meeting. Subsequent to the adoption of the 2017 Plan, no additional grants may be issued under the prior plans. The 2017 Plan provides for grants of up to 350,000 shares, which includes any shares subject to stock awards under the previous stock option plans. Stock Options: Under the 2017 Plan and previous plans, certain key employees have been granted the option to purchase set amounts of common stock at the market price on the day the option was granted. Optionees, at their own discretion, may cover the cost of exercise through the exchange at the then fair value of already owned shares of the Company’s stock. Options are granted for a 10 -year period and vest on a pro-rata basis over the initial three years from the grant date. The Company measures the fair value of each stock option at the date of grant using the Black-Scholes option pricing model using assumptions noted in the following table. Expected volatility is based on the historical volatility of the price of the Company’s common stock. The Company uses historical data to estimate option exercise and stock option forfeiture rates within the valuation model. The expected term of options granted is determined based on historical experience with similar options and represents the period of time that options granted are expected to be outstanding. The expected dividend yield is based on dividend trends and the market value of the Company’s common stock at the time of grant. The risk-free rate for periods within the expected life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. The following assumptions were used to determine the fair value of stock options as of the grant date to determine compensation expense for the years ended December 31, 2017 , 2016 , and 2015 : Stock Options: 2017 2016 2015 Grant date fair value $6.70 $6.31 $7.01 Expected life of options 8 years 8 years 8 years Risk-free interest rate 2.29 % 2.15 % 2.17 % Dividend yield rate 2.64 % 2.85 % 2.64 % Price volatility 23.43 % 27.37 % 28.63 % The following table summarizes stock option activity during 2017 : Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Life, in Years Outstanding at January 1, 2017 173,757 $23.65 Granted 26,112 33.03 Forfeited (4,525 ) 23.00 Exercised (51,899 ) 19.72 Outstanding at December 31, 2017 143,445 $26.79 5.60 At December 31, 2017 , 2016 , and 2015 , there were 89,561 , 119,898 , and 146,335 options exercisable, with weighted average exercise prices of $24.48 , $21.55 , and $21.20 , respectively. The aggregate intrinsic value of the stock options is the total pretax intrinsic value (i.e., the difference between the Company’s closing stock price on December 31, 2017 and the exercise price, times the number of shares) that would have been received by the option holders had all the option holders exercised their options on December 31, 2017 . This amount changes based on the fair value of the Company’s stock. The total intrinsic value of options outstanding and exercisable as of December 31, 2017 , 2016 , and 2015 was $670,000 , $1.2 million , and $794,000 , respectively. The total intrinsic value of options exercised for the years ended December 31, 2017 , 2016 , and 2015 was $631,000 , $208,000 , and $82,000 , respectively. The Company allows stock options to be exercised through cash or cashless transactions. Cashless stock option exercises require a portion of the options exercised to be net settled in satisfaction of the exercise price and applicable tax withholding requirements. In 2017 , 2016 , and 2015 the Company received cash of $69,000 , zero , and $169,000 , respectively, for cash stock option exercises. In 2017 , 2016 , and 2015 the Company net settled $954,000 , $847,000 , and $201,000 respectively, for cashless stock option exercises. The Company withheld $1.1 million , $1.1 million , and $358,000 to pay for stock option exercises or income taxes that resulted from the exercise of stock options in 2017 , 2016 , and 2015 , respectively. For the years ended December 31, 2017 , 2016 and 2015 , the Company recognized $152,000 , $207,000 , and $96,000 , respectively, in stock option compensation expense as a component of "Salaries and other personnel expense". As of December 31, 2017 , there was approximately $309,000 of total unrecognized compensation expense related to non-vested options, which is expected to be recognized over the weighted-average vesting period of 1.8 years. Restricted Stock Units: Under the 2017 Plan and previous plans, the Company grants restricted stock units to certain key employees periodically. Recipients of restricted stock units do not pay any cash consideration to the Company for the shares and receive all dividends with respect to such shares when the shares vest. Restricted stock units cliff vest at the end of a three -year time period. The following table summarizes restricted stock unit activity during 2017 : Number of Shares Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Life, in Years Outstanding at January 1, 2017 64,901 $28.04 Granted 23,967 33.12 Vested (19,727 ) 27.28 Forfeited (3,258 ) 28.28 Outstanding at December 31, 2017 65,883 $30.10 1.96 The total intrinsic value of restricted stock units vested for the years ended December 31, 2017 , 2016 , and 2015 was $676,000 , $501,000 , and $510,000 , respectively. For the years ended December 31, 2017 , 2016 and 2015 , the Company recognized $513,000 , $571,000 , and $512,000 , respectively, in restricted stock unit compensation expense as a component of "Salaries and other personnel expense". As of December 31, 2017 , there was approximately $1.4 million of total unrecognized compensation expense related to non-vested options, which is expected to be recognized over the weighted-average vesting period of 2.2 years.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2017
Regulatory Capital Requirements [Abstract]
Regulatory Matters	Regulatory Matters The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum requirements can initiate certain mandatory, and possibly discretionary, actions by regulators that, if undertaken, could have a direct material effect on a company's financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of the Company’s and the Bank’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory practices. The Company’s and the Bank’s capital amounts and classification are also subject to qualitative judgment by the regulators about components, risk weightings, and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Company and Bank to maintain minimum amounts and ratios (set forth in the following table) of total capital, Tier 1 capital, and common equity Tier 1 to risk-weighted assets, and of Tier 1 capital to average assets (as defined in the regulations). The tables below illustrate the capital requirements for the Company and the Bank and the actual capital ratios for each entity that exceed these requirements. The dividends that the Bank pays to the Company are limited to the extent necessary for the Bank to meet the regulatory requirements of a “well-capitalized” bank. The capital ratios for the Company exceed those for the Bank primarily because the $18 million trust preferred securities offerings that the Company completed in the second quarter of 2003 and in the fourth quarter of 2005 are included in the Company’s capital for regulatory purposes although they are accounted for as a liability in its financial statements. In the third quarter of 2017, the Company redeemed $8 million its trust preferred securities offerings. The trust preferred securities are not accounted for on the Bank’s financial statements nor are they included in its capital. As a result, the Company has $10 million and $18 million more in regulatory capital than the Bank at December 31, 2017 and 2016 , which explains most of the difference in the capital ratios for the two entities. Northrim BanCorp, Inc. Actual Adequately-Capitalized Well-Capitalized (In Thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2017: Common equity tier 1 capital (to risk-weighted assets) $177,005 13.89 % $57,345 ≥ 4.5 % NA NA Total Capital (to risk-weighted assets) $202,638 15.90 % $101,956 ≥ 8 % NA NA Tier I Capital (to risk-weighted assets) $186,637 14.65 % $76,438 ≥ 6 % NA NA Tier I Capital (to average assets) $186,637 12.41 % $60,157 ≥ 4 % NA NA As of December 31, 2016: Common equity tier 1 capital (to risk-weighted assets) $171,190 13.20 % $58,360 ≥ 4.5 % NA NA Total Capital (to risk-weighted assets) $204,927 15.80 % $103,761 ≥ 8 % NA NA Tier I Capital (to risk-weighted assets) $188,658 14.54 % $77,851 ≥ 6 % NA NA Tier I Capital (to average assets) $188,658 12.59 % $59,939 ≥ 4 % NA NA Northrim Bank Actual Adequately-Capitalized Well-Capitalized (In Thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2017: Common equity tier 1 capital (to risk-weighted assets) $161,996 12.83 % $56,819 ≥ 4.5 % $82,071 ≥ 6.5 % Total Capital (to risk-weighted assets) $177,857 14.08 % $101,055 ≥ 8 % $126,319 ≥ 10 % Tier I Capital (to risk-weighted assets) $161,996 12.83 % $75,758 ≥ 6 % $101,011 ≥ 8 % Tier I Capital (to average assets) $161,996 10.87 % $59,612 ≥ 4 % $74,515 ≥ 5 % As of December 31, 2016: Common equity tier 1 capital (to risk-weighted assets) $168,529 13.07 % $58,025 ≥ 4.5 % $83,813 ≥ 6.5 % Total Capital (to risk-weighted assets) $184,695 14.33 % $103,110 ≥ 8 % $128,887 ≥ 10 % Tier I Capital (to risk-weighted assets) $168,529 13.07 % $77,366 ≥ 6 % $103,155 ≥ 8 % Tier I Capital (to average assets) $168,529 11.30 % $59,656 ≥ 4 % $74,570 ≥ 5 % As of the most recent notification from its regulatory agencies, the Bank was categorized as well-capitalized under the regulatory framework for prompt corrective action. There are no conditions or events since that notification that management believes have changed the Bank’s regulatory capital category. Management believes, as of December 31, 2017 , that the Company and Bank meets all capital adequacy requirements to which they are subject. The Company and Bank are required to establish and phase-in a “conservation buffer,” consisting of a common equity Tier 1 capital amount equal to 2.5% of risk-weighted assets by 2019. An institution that does not meet the conservation buffer requirement will be subject to restrictions on certain activities including payment of dividends, stock repurchases, and discretionary bonuses to executive officers. The phase-in began in 2016 and increases until fully phased-in by 2019.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes At December 31, 2017 and 2016 , the Company had $5.3 million and $1.8 million in total taxes receivable, respectively, included in "Other assets" in the Consolidated Balance Sheets. The Company realized $3.5 million , $3.5 million , and $2.4 million in tax credits related to its investments in low income housing tax credit partnerships for 2017 , 2016 , and 2015 respectively. Components of the provision for income taxes are as follows: (In Thousands) Current Tax Expense (Benefit) Deferred Expense (Benefit) Total Expense 2017: Federal $2,618 $3,658 $6,276 State 1,423 346 1,769 Amortization of investment in low income housing tax credit partnerships 2,276 — 2,276 Total $6,317 $4,004 $10,321 2016: Federal $2,874 ($281 ) $2,593 State 674 (83 ) 591 Amortization of investment in low income housing tax credit partnerships 2,868 — 2,868 Total $6,416 ($364 ) $6,052 2015: Federal $4,752 $127 $4,879 State 1,200 21 1,221 Amortization of investment in low income housing tax credit partnerships 2,684 — 2,684 Total $8,636 $148 $8,784 The actual expense for 2017 , 2016 , and 2015 , differs from the “expected” tax expense (computed by applying the U.S. Federal Statutory Tax Rate of 35% for the year ended December 31, 2017 , 2016 , and 2015 ) as follows: (In Thousands) 2017 2016 2015 Computed “expected” income tax expense $8,330 $7,365 $9,491 State income taxes, net 1,225 384 794 Tax-exempt interest on investment securities (597 ) (566 ) (507 ) Amortization of investment in low income housing tax credit partnerships 2,276 2,868 2,684 Low income housing credits (3,468 ) (3,540 ) (2,446 ) Revaluation of deferred tax assets 2,678 — — Other (123 ) (459 ) (1,232 ) Total $10,321 $6,052 $8,784 The components of the net deferred tax asset are as follows: (In Thousands) 2017 2016 2015 Deferred Tax Asset: Allowance for loan losses $5,922 $7,717 $7,082 Loan fees, net of costs 825 1,823 1,896 Other real estate owned 160 123 46 Deferred compensation 1,218 2,112 2,005 Net operating loss carryforwards — — 73 Equity compensation 422 544 578 Loan discount 171 326 476 Fair market value adjustment on certificates of deposit 147 247 283 Unrealized loss on available for sale investment securities, net 59 195 235 Other 693 1,455 1,380 Total Deferred Tax Asset $9,617 $14,542 $14,054 Deferred Tax Liability: Intangible amortization ($219 ) ($2,804 ) ($2,494 ) Mortgage servicing rights (2,156 ) (415 ) (415 ) Depreciation and amortization (404 ) 31 (64 ) FHLB stock repurchase and dividends (179 ) (686 ) (686 ) Other (399 ) (404 ) (456 ) Total Deferred Tax Liability ($3,357 ) ($4,278 ) ($4,115 ) Net Deferred Tax Asset $6,260 $10,264 $9,939 A valuation allowance is provided when it is more likely than not that some portion of the deferred tax asset will not be realized. The primary source of recovery of the deferred tax asset will be future taxable income. Management believes it is more likely than not that the results of future operations will generate sufficient taxable income to realize the deferred tax asset. The deferred tax asset is included in "Other assets" in the Consolidated Balance Sheets. As of December 31, 2017 , the Company had no unrecognized tax benefits. There were no amounts related to interest and penalties recognized for the years ended December 31, 2017 , 2016 , and 2015 . The tax years subject to examination by federal and state taxing authorities are the years ending December 31, 2017 , 2016 , 2015 , and 2014 .

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following methods and assumptions were used to estimate fair value disclosures. All financial instruments are held for other than trading purposes. Cash and cash equivalents : Due to the short-term nature of these instruments, the carrying amounts reported in the balance sheet represent their fair values. Investment securities : Fair values for investment securities are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments. Investments in Federal Home Loan Bank stock are recorded at cost, which also represents fair value. Loans held for sale : Due to the short term nature of these instruments, the carrying amounts reported in the balance sheet represent their fair values. Loans : Fair values were generally determined by discounting both principal and interest cash flows on pools of loans expected to be collected using a discount rate for similar instruments with adjustments that the Company believes a market participant would consider in determining fair value. The Company estimates the cash flows expected to be collected using internal credit risk, interest rate and prepayment risk models that incorporate the Corporation’s best estimate of current key assumptions, such as default rates, loss severity and prepayment speeds for the life of the loan. The carrying value of loans is presented net of the Allowance (see Note 6 ). Impaired loans are carried at fair value. Specific valuation allowances are included in the Allowance. Purchased receivables : Fair values for purchased receivables are based on their carrying amounts due to their short duration and repricing frequency. Generally, purchased receivables have a duration of less than one year. Mortgage servicing rights: MSRs are measured at fair value on a recurring basis. These assets are classified as Level 3 as quoted prices are not available. In order to determine the fair value of MSRs, the present value of net expected future cash flows is estimated. Assumptions used include market discount rates, anticipated prepayment speeds, escrow calculations, delinquency rates, and ancillary fee income net of servicing costs. The model assumptions are also compared to publicly filed information from several large MSR holders, as available. Accrued interest receivable : Due to the short-term nature of these instruments, the carrying amounts reported in the balance sheet represent their fair values. Deposits : The fair value for deposits with stated maturities was determined by discounting contractual cash flows using current market rates for instruments with similar maturities. For deposits with no stated maturities; the carrying value was considered to approximate fair value and does not take into account the significant value of the cost advantage and stability of the Company's long-term relationships with depositors. Accrued interest payable : Due to the short-term nature of these instruments, the carrying amounts reported in the balance sheet represent their fair values. Securities sold under repurchase agreements : Fair values for securities sold under repurchase agreements are based on their carrying amounts due to their short duration and repricing frequency. Borrowings : Due to the short-term nature of these instruments, the carrying amount of short-term borrowings reported in the balance sheet approximate the fair value. Fair values for long-term borrowings are estimated using a discounted cash flow calculation that applies currently offered interest rates to a schedule of aggregate expected monthly payments. Accrued liability, RML acquisition payments: The carrying value of the accrued liability for estimated acquisition payments represents management's estimate of amounts owed to the sellers that are earned, but unpaid, as of the balance sheet date. Adjustments to the liability are reported in other operating expense. Due to the short-term nature of this liability, the carrying amounts reported in the consolidated balance sheets represents their fair values. Junior subordinated debentures : Fair value adjustments for junior subordinated debentures are based on discounted cash flows to maturity using current interest rates for similar financial instruments. Management utilized a market approach to determine the appropriate discount rate for junior subordinated debentures. Derivative Instruments: The fair value of the interest rate lock commitments are estimated using quoted or published market prices for similar instruments, adjusted for factors such as pull-through rate assumptions based on historical information, where appropriate. The pull-through rate assumptions are considered Level 3 valuation inputs and are significant to the interest rate lock commitment valuation; as such, the interest rate lock commitment derivatives are classified as Level 3. Interest rate contracts are valued in a model, which uses as its basis a discounted cash flow technique incorporating credit valuation adjustments to reflect nonperformance risk in the measurement of fair value. Although the Bank has determined that the majority of inputs used to value its interest rate derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of December 31, 2017 , the Bank has assessed the significance of the impact of these adjustments on the overall valuation of its interest rate positions and has determined that they are not significant to the overall valuation of its interest rate derivatives. As a result, the Bank has classified its interest rate derivative valuations in Level 2 of the fair value hierarchy. Assets subject to nonrecurring adjustment to fair value : The Company is also required to measure certain assets such as equity method investments, goodwill, intangible assets, impaired loans, and other real estate owned (“OREO”) at fair value on a nonrecurring basis in accordance with GAAP. Any nonrecurring adjustments to fair value usually result from the writedown of individual assets. The Company uses either in-house evaluations or external appraisals to estimate the fair value of OREO and impaired loans as of each reporting date. In-house appraisals are considered Level 3 inputs and external appraisals are considered Level 2 inputs. The Company’s determination of which method to use is based upon several factors. The Company takes into account compliance with legal and regulatory guidelines, the amount of the loan, the size of the assets, the location and type of property to be valued and how critical the timing of completion of the analysis is to the assessment of value. Those factors are balanced with the level of internal expertise, internal experience and market information available, versus external expertise available such as qualified appraisers, brokers, auctioneers and equipment specialists. The Company uses external sources to estimate fair value for projects that are not fully constructed as of the date of valuation. These projects are generally valued as if complete, with an appropriate allowance for cost of completion, including contingencies developed from external sources such as vendors, engineers and contractors. The Company believes that recording other real estate owned that is not fully constructed based on as if complete values is more appropriate than recording other real estate owned that is not fully constructed using as is values. We concluded that as-is-complete values are appropriate for these types of projects based on the accounting guidance for capitalization of project costs and subsequent measurement of the value of real estate. GAAP specifically states that estimates and cost allocations must be reviewed at the end of each reporting period and reallocated based on revised estimates. The Company adjusts the carrying value of other real estate owned in accordance with this guidance for increases in estimated cost to complete that exceed the fair value of the real estate at the end of each reporting period. Commitments to extend credit and standby letters of credit : The fair value of commitments is estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counterparties. For fixed-rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates. The fair value of letters of credit is based on fees currently charged for similar agreements or on the estimated cost to terminate them or otherwise settle the obligation with the counterparties at the reporting date. Limitations : Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Estimated fair values as of the periods indicated are as follows: December 31, 2017 December 31, 2016 (In Thousands) Carrying Amount Fair Value Carrying Amount Fair Value Financial assets: Level 1 inputs: Cash, due from banks and deposits in other banks $77,841 $77,841 $50,551 $50,551 Investment securities 59,117 59,117 43,486 43,486 Level 2 inputs: Investment securities 253,633 253,633 288,632 288,655 Investment in Federal Home Loan Bank Stock 2,115 2,115 1,965 1,965 Accrued interest receivable 4,385 4,385 3,734 3,734 Interest rate swaps 261 261 71 71 Level 3 inputs: Loans and loans held for sale 999,445 1,001,346 1,018,611 1,026,350 Purchased receivables, net 22,231 22,231 20,491 20,491 Interest rate lock commitments 873 873 1,137 1,137 Mortgage servicing rights 7,305 7,305 4,157 4,157 Financial liabilities: Level 2 inputs: Deposits $1,258,283 $1,257,670 $1,267,653 $1,266,995 Securities sold under repurchase agreements 27,746 27,746 27,607 27,607 Borrowings 7,362 7,308 4,338 4,186 Accrued interest payable 24 24 64 64 Interest rate swaps 77 77 71 71 Retail interest rate contracts — — 78 78 Level 3 inputs: Accrued liability, RML acquisition payments — — 186 186 Junior subordinated debentures 10,310 9,856 18,558 18,398 The following table sets forth the balances as of the periods indicated of assets measured at fair value on a recurring basis: (In Thousands) Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2017 Assets: Available for sale securities U.S. Treasury and government sponsored entities $249,461 $49,878 $199,583 $— Municipal securities 14,421 — 14,421 — Corporate bonds 37,132 3,508 33,624 — Collateralized loan obligations 6,005 — 6,005 — Preferred stock 5,731 5,731 — — Total available for sale securities $312,750 $59,117 $253,633 $— Interest rate swaps $261 $— $261 $— Interest rate lock commitments 873 — — 873 Mortgage servicing rights 7,305 — — 7,305 Total other assets $8,439 $— $261 $8,178 Liabilities: Interest rate swaps $77 $— $77 $— Total other liabilities $77 $— $77 $— December 31, 2016 Assets: Available for sale securities U.S. Treasury and government sponsored entities $263,361 $30,063 $233,298 $— Municipal securities 18,157 — 18,157 — U.S. Agency mortgage-backed securities 2 — 2 — Corporate bonds 44,732 8,456 36,276 — Preferred stock 4,967 4,967 — — Total available for sale securities $331,219 $43,486 $287,733 $— Interest rate swaps $71 $— $71 $— Interest rate lock commitments 1,137 — — 1,137 Mortgage servicing rights 4,157 — — 4,157 Total other assets $5,365 $— $71 $5,294 Liabilities: Interest rate swaps $71 $— $71 $— Retail interest rate contracts 78 — 78 — Total other liabilities $149 $— $149 $— The following table provides a reconciliation of the assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the years ended December 31, 2017 and 2016 : (In Thousands) Beginning balance Change included in earnings Purchases and issuances Sales and settlements Ending balance December 31, 2017 Interest rate lock commitments $1,137 ($1,615 ) $15,084 ($13,733 ) $873 Mortgage servicing rights 4,157 2 3,146 — 7,305 Total $5,294 ($1,613 ) $18,230 ($13,733 ) $8,178 December 31, 2016 Interest rate lock commitments $1,514 ($2,063 ) $20,612 ($18,926 ) $1,137 Mortgage servicing rights 1,654 (526 ) 3,029 — 4,157 Total $3,168 ($2,589 ) $23,641 ($18,926 ) $5,294 During 2017 and 2016 , no impairment or valuation adjustment was recognized for assets recognized at fair value on a nonrecurring basis, except for certain assets as shown in the following table. For loans measured for impairment, the Company classifies fair value measurements using observable inputs, such as external appraisals, as Level 2 valuations in the fair value hierarchy, and unobservable inputs, such as in-house evaluations, as Level 3 valuations in the fair value hierarchy. (In Thousands) Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2017 Loans measured for impairment $7,988 $— $— $7,988 Other real estate owned 3,927 — — 3,927 Other assets - equity method investment 2,292 — — 2,292 Total $14,207 $— $— $14,207 December 31, 2016 Loans measured for impairment $9,222 $— $— $9,222 Other real estate owned 1,700 — — 1,700 Total $10,922 $— $— $10,922 The following table presents the losses resulting from nonrecurring fair value adjustments for the periods ended December 31, 2017 and 2016, respectively: (In Thousands) 2017 2016 2015 Loans measured for impairment $352 $270 $269 Other real estate owned 904 187 361 Other operating expense - impairment on equity method investment 686 — — Total loss from nonrecurring measurements $1,942 $457 $630 Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) The following table provides a description of the valuation technique, unobservable input, and qualitative information about the unobservable inputs for the Company’s assets and liabilities classified as Level 3 and measured at fair value on a nonrecurring basis at December 31, 2017 and 2016: Financial Instrument Valuation Technique Unobservable Input Weighted Average or Rate Range December 31, 2017 Loans measured for impairment In-house valuation of collateral Discount rate 32% - 40% Discounted cash flow Discount rate 7 % Other real estate owned Fair value of collateral Estimated capital costs to complete improvements 25% - 32% Interest rate lock commitment External pricing model Pull through rate 93.05 % Mortgage servicing rights Discounted cash flow Constant prepayment rate 8.94% - 11.34% Discount rate 9.42% - 10.05% December 31, 2016 Loans measured for impairment In-house valuation of collateral Discount rate 49% - 100% Discounted cash flow Discount rate 7 % Other real estate owned Fair value of collateral Estimated capital costs to complete improvements 11.50% - 25% Interest rate lock commitment External pricing model Pull through rate 93 % Mortgage servicing rights Discounted cash flow Constant prepayment rate 11.2% - 21.29% Discount rate 9.21% - 10.75%

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information The Company's operations are managed along two operating segments: Community Banking and Home Mortgage Lending. The Community Banking segment's principal business focus is the offering of loan and deposit products to business and consumer customers in its primary market areas. As of December 31, 2017, the Community Banking segment operated 14 branches throughout Alaska. The Home Mortgage Lending segment's principal business focus is the origination and sale of mortgage loans for 1-4 family residential properties. Summarized financial information for the Company's reportable segments and the reconciliation to the consolidated financial results is shown in the following tables: December 31, 2017 (In Thousands) Community Banking Home Mortgage Lending Consolidated Interest income $58,308 $1,800 $60,108 Interest expense 1,860 570 2,430 Net interest income 56,448 1,230 57,678 Provision for loan losses 3,200 — 3,200 Other operating income 17,187 23,287 40,474 Compensation expense - RML acquisition payments 130 — 130 Other operating expense 50,271 20,752 71,023 Income before provision for income taxes 20,034 3,765 23,799 Provision for income taxes 9,499 822 10,321 Net income 10,535 2,943 13,478 Less: net income attributable to the noncontrolling interest 327 — 327 Net income attributable to Northrim BanCorp, Inc. $10,208 $2,943 $13,151 Total assets $1,453,115 $65,994 $1,519,109 Loans held for sale $— $43,778 $43,778 December 31, 2016 (In Thousands) Community Banking Home Mortgage Lending Consolidated Interest income $56,986 $1,932 $58,918 Interest expense 1,739 822 2,561 Net interest income 55,247 1,110 56,357 Provision for loan losses 2,298 — 2,298 Other operating income 13,756 29,507 43,263 Compensation expense, RML acquisition payments 4,775 — 4,775 Other operating expense 48,610 22,895 71,505 Income before provision for income taxes 13,320 7,722 21,042 Provision for income taxes 2,867 3,185 6,052 Net income 10,453 4,537 14,990 Less: net income attributable to the noncontrolling interest 579 — 579 Net income attributable to Northrim BanCorp, Inc. $9,874 $4,537 $14,411 Total assets $1,459,950 $66,590 $1,526,540 Loans held for sale $— $43,596 $43,596 December 31, 2015 (In Thousands) Community Banking Home Mortgage Lending Consolidated Interest income $57,729 $2,051 $59,780 Interest expense 1,796 1,075 2,871 Net interest income 55,933 976 56,909 Provision (benefit) for loan losses 1,754 — 1,754 Other operating income 14,995 29,613 44,608 Compensation expense, RML acquisition payments 4,094 — 4,094 Other operating expense 47,070 21,481 68,551 Income before provision for income taxes 18,010 9,108 27,118 Provision for income taxes 5,024 3,760 8,784 Net income 12,986 5,348 18,334 Less: net income attributable to the noncontrolling interest 551 — 551 Net income attributable to Northrim BanCorp, Inc. $12,435 $5,348 $17,783 Total assets $1,431,759 $67,733 $1,499,492 Loans held for sale $— $50,553 $50,553

Parent Company Information

Parent Company Information	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Information	Parent Company Information Balance Sheets at December 31, 2017 2016 (In Thousands) Assets Cash and cash equivalents $15,872 $11,963 Investment securities available for sale 5,731 4,967 Investment in Northrim Bank 177,824 184,511 Investment in NISC 1,469 1,487 Investment in NCT1 — 248 Investment in NST2 310 310 Other assets 1,951 2,248 Total Assets $203,157 $205,734 Liabilities Junior subordinated debentures $10,310 $18,558 Other liabilities 45 582 Total Liabilities 10,355 19,140 Shareholders' Equity Common stock 6,872 6,898 Additional paid-in capital 61,793 62,952 Retained earnings 124,322 117,141 Accumulated other comprehensive loss (185 ) (397 ) Total Shareholders' Equity 192,802 186,594 Total Liabilities and Shareholders' Equity $203,157 $205,734 Statements of Income for Years Ended: 2017 2016 2015 (In Thousands) Income Interest income $408 $369 $116 Equity in undistributed earnings from Northrim Bank 14,003 15,301 18,865 Equity in undistributed earnings from NISC 122 95 140 Other income 52 — 175 Total Income $14,585 $15,765 $19,296 Expense Interest expense 516 534 463 Administrative and other expenses 2,242 2,382 2,191 Total Expense 2,758 2,916 2,654 Income Before Benefit from Income Taxes 11,827 12,849 16,642 Benefit from income taxes (1,324 ) (1,562 ) (1,141 ) Net Income $13,151 $14,411 $17,783 Statements of Cash Flows for Years Ended: 2017 2016 2015 (In Thousands) Operating Activities: Net income $13,151 $14,411 $17,783 Adjustments to Reconcile Net Income to Net Cash: Equity in undistributed earnings from subsidiaries (14,101 ) (15,396 ) (19,005 ) Stock-based compensation 665 778 608 Changes in other assets and liabilities 176 (1,458 ) (298 ) Net Cash Used from Operating Activities (109 ) (1,665 ) (912 ) Investing Activities: Purchases of investment securities available for sale (499 ) (1,373 ) (3,549 ) Proceeds from sales/calls/maturities of securities available for sale — — 2,998 Investment in Northrim Bank, NISC, NCT1 & NST2 11,989 10,115 9,842 Net Cash Provided by Investing Activities 11,490 8,742 9,291 Financing Activities: Dividends paid to shareholders (5,965 ) (5,372 ) (5,117 ) Proceeds from issuance of common stock and excess tax benefits 100 — 106 Repurchase of common stock (1,607 ) — — Net Cash Used from Financing Activities (7,472 ) (5,372 ) (5,011 ) Net change in Cash and Cash Equivalents 3,909 1,705 3,368 Cash and Cash Equivalents at beginning of year 11,963 10,258 6,890 Cash and Cash Equivalents at end of year $15,872 $11,963 $10,258

Quarterly Results of Operations

Quarterly Results of Operations (Unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Data [Abstract]
Quarterly Results of Operations (Unaudited)	Quarterly Results of Operations (Unaudited) 2017 Quarter Ended Dec. 31 Sept. 30 June 30 March 31 (In Thousands Except Per Share Amounts) Total interest income $15,232 $15,519 $14,892 $14,465 Total interest expense 548 602 648 632 Net interest income 14,684 14,917 14,244 13,833 Provision for loan losses — 2,500 300 400 Other operating income 7,952 13,855 9,762 8,905 Compensation expense, RML acquisition payments (193 ) 149 — 174 Other operating expense 18,530 17,542 18,510 16,441 Income before provision for income taxes 4,299 8,581 5,196 5,723 Provision for income taxes 4,085 2,980 1,455 1,801 Net Income 214 5,601 3,741 3,922 Less: Net income attributable to the noncontrolling interest — 78 152 97 Net income attributable to Northrim Bancorp, Inc. $214 $5,523 $3,589 $3,825 Earnings per share, basic $0.03 $0.80 $0.52 $0.55 Earnings per share, diluted $0.03 $0.79 $0.51 $0.55 2016 Quarter Ended Dec. 31 Sept. 30 June 30 March 31 (In Thousands Except Per Share Amounts) Total interest income $14,522 $14,860 $14,718 $14,818 Total interest expense 631 647 639 644 Net interest income 13,891 14,213 14,079 14,174 Provision for loan losses 743 652 200 703 Other operating income 10,359 11,935 11,864 9,105 Compensation expense, RML acquisition payments 708 3,250 687 130 Other operating expense 17,646 17,936 18,682 17,241 Income before provision for income taxes 5,153 4,310 6,374 5,205 Provision for income taxes 1,458 1,027 1,868 1,699 Net Income 3,695 3,283 4,506 3,506 Less: Net income attributable to the noncontrolling interest 105 188 156 130 Net income attributable to Northrim Bancorp, Inc. $3,590 $3,095 $4,350 $3,376 Earnings per share, basic $0.52 $0.45 $0.63 $0.49 Earnings per share, diluted $0.51 $0.44 $0.63 $0.48

Summary of Significant Accoun35

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Method of Accounting	Method of Accounting: The Company prepares its consolidated financial statements in conformity with accounting principles generally accepted in the United States and prevailing practices within the banking industry. The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of income, gains, expenses, and losses during the reporting periods. Actual results could differ from those estimates. Significant estimates include the allowance for loan losses (“Allowance”), valuation of goodwill and other intangibles, valuation of other real estate owned (“OREO”), valuation of mortgage servicing rights, and fair value disclosures.
Consolidation	Consolidation: The Company consolidates affiliates in which we have a controlling interest. The accompanying consolidated financial statements include the accounts of the Company, the Bank, RML, NBG, and Northrim Investment Services Company (“NISC”). Significant intercompany balances have been eliminated in consolidation. As of December 31, 2017, the Company had one wholly-owned trust ("Trust") that was formed to issue trust preferred securities and related common securities of the Trust. The Company has not consolidated the accounts of the Trust in its consolidated financial statements in accordance with Financial Accounting Standards Board Accounting Standards Codification (“FASB”) ASC 810, Consolidation (“ASC 810”). As a result, the junior subordinated debentures issued by the Company to the Trust are reflected on the Company’s consolidated balance sheet as junior subordinated debentures.
Variable Interest Entities	The Company has determined that PWA and Homestate are not variable interest entities and therefore, the Company does not consolidate the balance sheets and income statements of PWA or Homestate into its financial statements. The Company's investments in PWA and Homestate are accounted for as equity method investments. Results of PWA and Homestate are included in "Other income" in our Consolidated Statements of Income. Investments in associated companies are presented on a one-line basis in the caption “Other assets” in our Consolidated Balance Sheets.
Operating Segments	Operating Segments: Public enterprises are required to report certain information about their operating segments in a complete set of financial statements to shareholders. The basis for determining the Company's operating segments is the manner in which management operates the business.
Reclassifications	Reclassifications: Certain 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
Subsequent Events	Subsequent Events: The Company has evaluated events and transactions subsequent to December 31, 2017 for potential recognition or disclosure.
Cash and Cash Equivalents	Cash and Cash Equivalents: For purposes of reporting cash flows, cash and cash equivalents include cash on hand, amounts due from banks, interest-bearing deposits with other banks, federal funds sold, and securities with original maturities of less than 90 days at acquisition.
Investment Securities	Investment Securities: Securities available for sale are stated at fair value with unrealized holding gains and losses, net of tax, excluded from earnings and reported as a separate component of other comprehensive income, unless an unrealized loss is deemed other than temporary. Gains and losses on available for sale securities sold are determined on a specific identification basis. Held to maturity securities are stated at cost, adjusted for amortization of premium and accretion of discount on a level-yield basis. The Company has the ability and intent to hold these securities to maturity. A decline in the market value of any available for sale or held to maturity security below cost that is deemed other than temporary results in a charge to earnings and the establishment of a new cost basis for the security. Unrealized investment securities losses are evaluated at least quarterly on a specific identification basis to determine whether such declines in value should be considered "other than temporary" and therefore be subject to immediate loss recognition in income. Although these evaluations involve significant judgment, an unrealized loss in the fair value of a debt security is generally deemed to be temporary when the fair value of the security is below the carrying value primarily due to changes in interest rates and there has not been significant deterioration in the financial condition of the issuer. The Company does not intend to sell, nor is it more likely than not that it will be required to sell, securities whose market value is less than carrying value. Because it is more likely than not that the Company will hold these investments until a market price recovery or maturity, these investments are not considered other than temporarily impaired. Other factors that may be considered in determining whether a decline in the value is "other than temporary" include the financial condition, capital strength, and near-term prospects of the issuer; actions of commercial banks or other lenders relative to the continued extension of credit facilities to the issuer of the security; recommendations of investment advisors or market analysts; and ratings by recognized rating agencies.
Federal Home Loan Bank Stock	Federal Home Loan Bank Stock: The Company’s investment in Federal Home Loan Bank of Des Moines (“FHLB”) stock is carried at par value because the shares can only be redeemed with the FHLB at par. The Company is required to maintain a minimum level of investment in FHLB stock based on the Company’s total Bank assets and outstanding advances. FHLB stock is carried at cost and is subject to recoverability testing at least annually.
Loans held for sale	Loans held for sale: The Company designates loans held for sale as either fair value or the lower of cost or fair value at origination. Loans held for sale include residential mortgage loans that have been originated for sale in the secondary market. Related gains or losses on the sale of these loans are recognized in mortgage banking income.
Loans	Loans: Loans are carried at their principal amount outstanding, net of charge-offs, unamortized fees, and direct loan origination costs. Loan balances are charged-off to the Allowance when management believes that collection of principal is unlikely. Interest income on loans is accrued and recognized on the principal amount outstanding except for loans in a nonaccrual status. All classes of loans are placed on nonaccrual when management believes doubt exists as to the collectability of the interest or principal. Cash payments received on nonaccrual loans are directly applied to the principal balance. Generally, a loan may be returned to accrual status when the delinquent principal and interest is brought current in accordance with the terms of the loan agreement and certain ongoing performance criteria have been met. Loans are reported as past due when installment payments, interest payments, or maturity payments are past due based on contractual terms. The Company considers a loan to be impaired when it is probable that it will be unable to collect all amounts due according to the contractual terms of the loan agreement. Once a loan is determined to be impaired, the impairment is measured based on the present value of the expected future cash flows discounted at the loan’s effective interest rate, unless the loan is collateral dependent, in which case the impairment is measured by using the fair value of the loan’s collateral. Nonperforming loans greater than $50,000 are individually evaluated for impairment based upon the borrower’s overall financial condition, resources, and payment record, and the prospects for support from any financially responsible guarantors. The Company uses either in-house evaluations or external appraisals to estimate the fair value of collateral-dependent impaired loans as of each reporting date. The Company’s determination of which method to use is based upon several factors. The Company takes into account compliance with legal and regulatory guidelines, the amount of the loan, the estimated value of the collateral, the location and type of collateral to be valued, and how critical the timing of completion of the analysis is to the assessment of value. Those factors are balanced with the level of internal expertise, internal experience, and market information available, versus external expertise available such as qualified appraisers, brokers, auctioneers, and equipment specialists. The Company uses external appraisals to estimate fair value for projects that are not fully constructed as of the date of valuation. These projects are generally valued as if complete, with an appropriate allowance for cost of completion, including contingencies developed from external sources such as vendors, engineers, and contractors. The Company classifies fair value measurements using observable inputs, such as external appraisals, as level 2 valuations in the fair value hierarchy, and fair value measurements with unobservable inputs, such as in-house evaluations, as level 3 valuations in the fair value hierarchy. When the fair value measurement of the impaired loan is less than the recorded amount of the loan, an impairment is recognized by recording a charge-off to the Allowance or by designating a specific reserve in accordance with GAAP. The Company’s policy is to record cash payments received on impaired loans that are not also nonaccrual loans in the same manner that cash payments are applied to performing loans. A loan is classified as a troubled debt restructuring ("TDR") when a borrower is experiencing financial difficulties that lead to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. These concessions may include interest rate reductions, principal forgiveness, extension of maturity date and other actions intended to minimize potential losses. Generally, a nonaccrual loan that is restructured remains on nonaccrual status for a period of at least six months to demonstrate that the borrower can meet the restructured terms. If the borrower's performance under the new terms is not reasonably assured, the loan remains classified as a nonaccrual loan. Interest on TDRs will be accrued at the restructured rates when it is anticipated that no loss of original principal will occur, and the interest can be collected, which is generally after a period of six months. Loan origination fees received in excess of direct origination costs are deferred and accreted to interest income using a method approximating the level-yield method over the life of the loan.
Acquired Loans	Acquired Loans: Loans are recorded at their fair value at the acquisition date. Credit discounts are included in the determination of fair value; therefore, an allowance for loan losses is not recorded at the acquisition date. Purchased loans are evaluated upon acquisition and classified as either purchased credit impaired or purchased non-credit-impaired. Purchased credit impaired loans reflect credit deterioration since origination such that it is probable at acquisition that the Company will be unable to collect all contractually required payments. Purchased credit impaired loans were individually evaluated for credit impairment at acquisition using expected future cash flows or the estimated value of underlying collateral. A purchased credit impaired loan will be removed from impaired loans only if the loan is sold, foreclosed, or assets are received in full satisfaction of the loan, and it will be removed from impaired loans at its carrying value. If an individual loan is removed, the difference between its relative carrying amount and its cash, fair value of the collateral, or other assets received will be recognized in other income immediately as a gain and would not affect the effective yield used to recognize the accretable yield on purchased credit impaired loans. The excess of the undiscounted contractual balances due over the cash flows expected to be collected is considered to be the nonaccretable difference. The nonaccretable difference represents our estimate of the credit losses expected to occur and was considered in determining the fair value of the purchased credit impaired loans as of the acquisition date. Subsequent to the acquisition date, any increases in expected cash flows over those expected at purchase date in excess of fair value are adjusted through an increase to the accretable yield on a prospective basis. The purchased credit impaired loans are and will continue to be subject to the Company’s internal and external credit review and monitoring. If credit deterioration is experienced subsequent to the initial acquisition fair value amount, such deterioration will be measured, and a charge-off will be recorded. For purchased non-credit-impaired loans, the difference between the fair value and unpaid principal balance of the loan at the acquisition date is amortized or accreted to interest income over the estimated life of the loans. For the purpose of estimating the Allowance, the Company has evaluated the credit quality of purchased non-credit-impaired loans separately from loans that were originated by the Company; however, purchased non-credit-impaired loans that have been identified as impaired subsequent to the merger are included in the Company's normal process for reporting impaired loans and calculation of a specific valuation allowance. Purchases of non-credit-impaired loans that have not been identified as impaired subsequent to the merger are evaluated for significant changes subsequent to the merger to determine if the underlying credit quality of these loans would require a provision and establishment of an allowance specific to these loans.
Allowance for Loan Losses	Allowance for Loan Losses: The Allowance for Loan Losses is management’s best estimate of probable losses inherent in its loan portfolio. Accordingly, the methodology is based on historical loss experience by loan segment and class with adjustments for current events and conditions. The Company’s process for determining the appropriate level of the Allowance for probable loan losses is designed to account for credit deterioration as it occurs. The provision for loan losses reflects loan quality trends, including levels of and trends related to past due and nonaccrual loans, net charge-offs or recoveries, and other factors. The Company has identified the following segments: commercial, real estate construction one-to-four family, real estate construction other, real estate term owner occupied, real estate term non-owner occupied, real estate term other, consumer loans secured by 1 st deeds of trust, and other consumer loans. Then the Company further disaggregates each segment into the following classes, which are also known as asset quality ratings: pass (grades 1-6), special mention (grade 7), substandard (grade 8), doubtful (grade 9), and loss (grade 10). The level of the Allowance reflects management’s continuing evaluation of industry concentrations, specific credit risks, loan loss experience, current loan portfolio quality, present economic, political and regulatory conditions and unidentified losses inherent in the current loan portfolio. Portions of the allowance may be allocated for specific credits; however, the entire allowance is available for any credit that, in management’s judgment, should be charged off. While management utilizes its best judgment and information available, the ultimate adequacy of the Allowance is dependent upon a variety of factors beyond the Company’s control including, among other things, the performance of the Company’s loan portfolio, the economy, changes in interest rates, and the view of the regulatory authorities toward loan classification. The Company’s Allowance consists of three elements: (1) specific valuation allowances based on probable losses on specific loans, (2) general valuation allowances based on historical loan loss experience for similar loans with similar characteristics and trends, adjusted as necessary to reflect the impact of current conditions, and (3) unallocated general valuation allowances based on general economic conditions and other qualitative risk factors both internal and external to the Company. The specific valuation allowance is an allocated allowance for impaired loans. This analysis is based upon a specific analysis for each impaired loan that is collateral dependent, including appraisals and in-house evaluations on loans secured by real property, management’s assessment of the current market, recent payment history, and an evaluation of other sources of repayment. The Company obtains appraisals on real and personal property that secure its loans during the loan origination process in accordance with regulatory guidance and its loan policy. The Company then estimates a general allocated allowance for all other loans that were not impaired as of the balance sheet date using a formula-based approach that includes average historical loss factors that are adjusted for quantitative and qualitative factors. Qualitative factors are based on management’s assessment of current trends that may cause losses inherent in the current loan portfolio to differ significantly from historical losses. The Company uses a formula-based approach that includes average historical loss factors that are adjusted for qualitative factors to establish this portion of the Allowance. After the portfolio has been disaggregated into segments and classes, the Company calculates a general reserve for each segment and class based on the average five year loss history for each segment and class. This general reserve is then adjusted for qualitative factors, by segment and class. Qualitative factors are based on management’s assessment of current trends that may cause losses inherent in the current loan portfolio to differ significantly from historical losses. Some factors that management considers in determining the qualitative adjustment to the general reserve include our concentration of large borrowers; national and local economic trends; general business conditions; economic, political, and industry specific factors that affect resource development in Alaska; underwriting policies and standards; trends in local real estate markets; effects of various political activities; peer group data; and internal factors such as underwriting policies and expertise of the Company’s employees. The unallocated general valuation portion of the Allowance is based on several factors, including the level of the Allowance as compared to total loans and nonperforming loans in light of current economic conditions. This portion of the Allowance is deemed “unallocated” because it is not allocated to any segment or class of the loan portfolio. This portion of the Allowance provides for coverage of credit losses inherent in the loan portfolio but not captured in the credit loss factors that are utilized in the risk rating-based component or in the specific impairment component of the Allowance and acknowledges the inherent imprecision of all loss prediction models. This portion of the Allowance is based upon management’s evaluation of various factors that are not directly measured in the determination of the allocated portions of the Allowance. Such factors include uncertainties in identifying triggering events that directly correlate to subsequent loss rates, uncertainties in economic conditions, risk factors that have not yet manifested themselves in loss allocation factors, and historical loss experience data that may not precisely correspond to the current portfolio. In addition, the unallocated reserve may fluctuate based upon the direction of various risk indicators. Examples of such factors include the risk as to current and prospective economic conditions, the level and trend of charge offs or recoveries, and the risk of heightened imprecision or inconsistency of appraisals used in estimating real estate values. Although this allocation process may not accurately predict credit losses by loan type or in aggregate, the total allowance for credit losses is available to absorb losses that may arise from any loan type or category. Based on our methodology and its components, management believes the resulting Allowance is adequate and appropriate for the risk identified in the Company's loan portfolio. While management believes that it uses the best information available to determine the Allowance, unforeseen market conditions and other events could result in adjustment to the Allowance, and net income could be significantly affected if circumstances differed substantially from the assumptions used in making the final determination. Our banking regulators, as an integral part of their examination process, periodically review the Company's Allowance. Our regulators may require the Company to recognize additions to the Allowance based on their judgments related to information available to them at the time of their examinations.
Reserve for Unfunded Loan Commitments and Letters of Credit	Reserve for Unfunded Loan Commitments and Letters of Credit: The Company maintains a separate reserve for losses related to unfunded loan commitments and letters of credit. The determination of the adequacy of the reserve is based on periodic evaluations of the unfunded credit facilities including assessment of historical losses and current economic conditions. The allowance for unfunded loan commitments and letters of credit is included in other liabilities on the Consolidated Balance Sheets, with changes to the balance charged against noninterest expense.
Purchased Receivables	Purchased Receivables: The Bank purchases accounts receivable from its customers. The purchased receivables are carried at their principal amount outstanding, net of a reserve for anticipated losses that have not yet been identified. Fees charged to the customer are earned while the balances of the purchases are outstanding, which is typically less than one year. The Company maintains a separate reserve for losses related to purchased receivable assets. The determination of the adequacy of the reserve is based on periodic evaluations of purchased receivable assets including an assessment of historical losses and current economic conditions. The reserve for purchased receivable assets is included in the balance of these accounts on a net basis on the consolidated balance sheets, with changes to the balance charged against noninterest expense.
Other Real Estate Owned	Other Real Estate Owned: Other real estate owned represents properties acquired through foreclosure or its equivalent. Prior to foreclosure, the carrying value is adjusted to the fair value, less cost to sell, of the real estate to be acquired by an adjustment to the Allowance. Management’s evaluation of fair value is based on appraisals or discounted cash flows of anticipated sales. After foreclosure, any subsequent reduction in the carrying value is charged against earnings. Operating expenses associated with other real estate owned are charged to earnings in the period they are incurred.
Premises and Equipment	Premises and Equipment: Premises and equipment, including leasehold improvements, are stated at cost, less accumulated depreciation and amortization. Depreciation and amortization expense for financial reporting purposes is computed using the straight-line method based upon the shorter of the lease term or the estimated useful lives of the assets that vary according to the asset type and include; furniture and equipment ranging between 3 and 7 years , leasehold improvements ranging between 2 and 15 years , and buildings at 39 years . Maintenance and repairs are charged to current operations, while renewals and betterments are capitalized. Long-lived assets such as premises and equipment are reviewed for impairment at least annually or whenever events or changes in business circumstances indicate that the remaining useful life may warrant revision, or that the carrying amount of the long-lived asset may not be fully recoverable. If impairment is determined to exist, any related impairment loss is calculated based on fair value. Impairment losses on assets to be disposed of, if any, are based on the estimated proceeds to be received, less costs of disposal.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets: Intangible assets are comprised of goodwill and other intangibles acquired in business combinations. Goodwill and intangible assets with indefinite useful lives are not amortized. Intangible assets with definite useful lives are amortized to their estimated residual values over their respective useful lives, and are also reviewed for impairment. Amortization of intangible assets is included in other operating expense in the Consolidated Statements of Income. The Company performs a goodwill impairment analysis at the segment level on an annual basis. Additionally, the Company performs a goodwill impairment evaluation on an interim basis when events or circumstances indicate impairment potentially exists.
Low Income Housing Tax Credit Partnerships	Low Income Housing Tax Credit Partnerships: The Company earns a return on its investments in these partnerships in the form of tax credits and deductions that flow through to it as a limited partner. The Company amortizes these investments in tax expense over the period during which tax credits are used.
Mortgage Servicing Rights	Mortgage Servicing Rights: Mortgage servicing rights ("MSRs") are the rights to service mortgage loans for others. The Company measures MSRs at fair value and reports changes in fair value through earnings. Changes in the fair value of MSRs occur primarily due to the collection/realization of expected cash flows, as well as changes in valuation inputs and assumptions. Under the fair value method, MSRs are carried on the balance sheet at fair value and the changes in fair value are reported in earnings in other operating income in the period in which the change occurs. Fair value measurements are determined using a discounted cash flow model. In order to determine the fair value of MSRs, the present value of net expected future cash flows is estimated. Assumptions used include market discount rates, anticipated prepayment speeds, escrow calculations, delinquency rates, and ancillary fee income net of servicing costs. The model assumptions are also compared to publicly filed information from several large MSR holders, as available.
Other Assets	Other Assets: Other assets include purchased software and prepaid expenses. Purchased software is carried at amortized cost and is amortized using the straight-line method over its estimated useful life or the term of the agreement. Also included in other assets is the net deferred tax asset, bank owned life insurance, accrued interest receivable, taxes receivable, rate lock derivatives, and the Company’s equity method investments. The Company performs an impairment analysis on it's equity method investments when events or circumstances indicate impairment potentially exists.
Derivatives	Derivatives: The Company records all derivatives on the Consolidated Balance Sheets at fair value. The accounting for change in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate the derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Interest rate swaps that are designated as a cash flow hedge and satisfy the hedge accounting requirements involve the receipt of variable amounts from a counter-party in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. For derivatives which are designed as cash flow hedges and satisfy hedge accounting requirements, the effective portion of changes in the fair value of the derivative is recorded in accumulated other comprehensive income (loss). The ineffective portion of a change in the fair value of the derivative is recognized directly in earnings. The fair value of the Company's derivatives is determined using discounted cash flow analysis sing observable market based inputs. The Company considers all free-standing derivatives not designated in a hedging relationship as economic hedges and recognizes these derivatives as either assets or liabilities in the balance sheet and requires measurement of those instruments at fair value through adjustments to current earnings. By using derivatives, the Company is exposed to counterparty credit risk, which is the risk that counterparties to the derivative contracts do not perform as expected. If a counterparty fails to perform, our counterparty credit risk is equal to the amount reported as a derivative asset on our balance sheet, net of cash collateral received. We minimize counterparty credit risk through credit approvals, limits, monitoring procedures, and obtaining collateral, where appropriate. For derivative instruments executed with the same counterparty under a master netting arrangement, we do not offset fair value amounts of interest rate swaps in liability position with the ones in asset position.
Transfers or sales of financial assets	Transfers or sales of financial assets: For transfers of entire financial assets or a participating interest in an entire financial asset recorded as sales, we recognize and initially measure at fair value all assets obtained and liabilities incurred. We record a gain or loss in noninterest income for the difference between the carrying amount and the fair value of the assets sold. Fair values are based on quoted market prices, quoted market prices for similar assets, or if market prices are not available, then the fair value is estimated using discounted cash flow analysis with assumptions for credit losses, prepayments and discount rates that are corroborated by and verified against market observable data, where possible.
Advertising	Advertising: Advertising, promotion, and marketing costs are expensed as incurred.
Stock Incentive Plans	Stock Incentive Plans: The Company accounts for its stock incentive plans using a fair-value-based method of accounting for stock-based employee compensation plans. The Company has elected the modified prospective method for recognition of compensation cost associated with stock-based employee compensation awards. The Company amortizes stock-based compensation expense over the vesting period of each award.
Income Taxes	Income Taxes: The Company uses the asset and liability method of accounting for income taxes. Under the asset and liability method, deferred income taxes are recognized for the future consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date. Our policy is to recognize interest and penalties on unrecognized tax benefits in “Provision for income taxes” in the Consolidated Statements of Income.
Earnings Per Share	Earnings Per Share: Earnings per share is calculated using the weighted average number of shares and dilutive common stock equivalents outstanding during the period. Stock options and restricted stock units, as described in Note 20 , are considered to be common stock equivalents. Potentially dilutive shares are excluded from the computation of earnings per share if their effect is anti-dilutive.
Comprehensive Income	Comprehensive Income: Comprehensive income consists of net income, net unrealized gains (losses) on securities available for sale after the tax effect, and net unrealized gains (losses) on derivative and hedging activities.
Concentrations	Concentrations: Substantially all of the Company’s business is derived from the Anchorage, Matanuska-Susitna Valley, Fairbanks, and Southeast areas of Alaska. As such, the Company’s growth and operations depend upon the economic conditions of Alaska and these specific markets. These areas rely primarily upon the natural resources industries, particularly oil production, as well as tourism, government and U.S. military spending for their economic success. A significant majority of the unrestricted revenues of the Alaska state government are currently funded through various taxes and royalties on the oil industry. The Company’s business is and will remain sensitive to economic factors that relate to these industries and local and regional business conditions. As a result, local or regional economic downturns, or downturns that disproportionately affect one or more of the key industries in regions served by the Company, may have a more pronounced effect upon its business than they might on an institution that is less geographically concentrated. The extent of the future impact of these events on economic and business conditions cannot be predicted; however, prolonged or acute fluctuations could have a material and adverse impact upon the Company’s results of operation and financial condition.
Fair Value Measurements	Fair Value Measurements: The Company groups its assets and liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: • Level 1 : Valuation is based upon quoted prices for identical instruments traded in active exchange markets, such as the New York Stock Exchange. Valuations are obtained from readily available pricing sources for market transactions involving identical assets or liabilities. • Level 2 : Valuation is based upon quoted market prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. • Level 3 : Valuation is generated from model-based techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect the Company’s estimation of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models, and similar techniques.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In general, this new guidance requires companies to use more judgment and make more estimates than under current guidance, including identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. ASU 2014-09 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2017; early adoption is permitted for annual reporting periods. For financial reporting purposes, the standard allows for either full retrospective adoption, meaning the standard is applied to all of the periods presented, or modified retrospective adoption, meaning the standard is applied only to the most current period presented in the financial statements with the cumulative effect of initially applying the standard recognized at the date of initial application. The Company has reviewed all revenue sources to determine the sources that are in scope for this guidance. As a bank, key revenue sources, including interest income and mortgage banking income have been identified as out of scope of this new guidance. The Company's overall assessment of material in-scope revenue sources include service charges on deposits and credit card payment processing fees. The Company adopted the guidance on January 1, 2018, utilizing the modified retrospective approach. The guidance will not have a material or significant impact on the Company's consolidated financial statements. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). The new guidance is intended to improve the recognition and measurement of financial instruments. 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. In addition, the amendment requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes and requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements. This ASU also eliminates 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. The amendment also requires a reporting organization 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 (also referred to as "own credit") when the organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. ASU No. 2016-01 is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company adopted the guidance on January 1, 2018 and it will not have a material impact on the Company's consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (“ASU 2016-02”). ASU 2016-02 requires lessees, among other things, to recognize lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under previous authoritative guidance. This update also introduces new disclosure requirements for leasing 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. Although an estimate of the impact of the new leasing standard has not yet been determined, the Company expects a significant new lease asset and related lease liability on the balance sheet due to the number of leased properties the Company currently has that are accounted for under current operating lease guidance. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (“ASU 2016-13”). ASU 2016-13 is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. The standard requires the measurement of all expected credit losses for certain financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates, but will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. ASU 2016-13 requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization's portfolio. These disclosures include qualitative and quantitative requirements that provide additional information about the amounts recorded in the financial statements. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. The ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early application will be permitted for specified periods. The Company has an established cross-functional team and project management governance process in place to manage implementation of this new guidance. The team has been working on the process by vetting the data elements and implementing modeling options that are expected to be critical to the new process. An estimate of the impact of this standard has not yet been determined, however, the impact is expected to be significant.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 has formed a cross-functional team to begin implementation efforts of this new guidance. The team is evaluating the data elements and modeling options that are expected to be critical to the new process. Additionally, the Company is considering engaging external consulting services related to this effort in 2018. An estimate of the impact of this standard on the Company's consolidated financial position and results of operations has not yet been determined, however, the impact is expected to be significant and the impact on the Company's process for calculating the Allowance is also expected to be significant. 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. In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other (“ASU 2017-04”). ASU 2017-04 simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. ASU 2017-04 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2019, and must be applied on a prospective basis. 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 2017, the FASB issued ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (“ASU 2017-08”). ASU 2017-08 amends the amortization period for certain purchased callable debt securities held at a premium by shortening the amortization period for the premium to the earliest call date. Under the current guidance, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. ASU 2017-08 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2018, and should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings. The Company intends to early adopt this standard for the interim period ending March 31, 2018, and 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 May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (“ASU 2017-09”). ASU 2017-09 provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. ASU 2017-09 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2017, and will be applied prospectively to an award modified on or after the adoption date. 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 August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (“ASU 2017-12”). ASU 2017-12 improves the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. In addition to that main objective, the amendments in this ASU make certain targeted improvements to simplify the application of the hedge accounting guidance in current GAAP based on the feedback received from preparers, auditors, users, and other stakeholders. ASU 2017-12 is effective for the Company’s financial statements for annual and interim periods beginning on or after December 15, 2018, and all transition requirements and elections must be applied to hedging relationships existing (that is, hedging relationships in which the hedging instrument has not expired, been sold, terminated, or exercised or the entity has not removed the designation of the hedging relationship) on the date of adoption. The Company intends to early adopt this standard for the interim period ending March 31, 2018, and 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 2018, the FASB issued ASU 2018-02, Income Statement-Reporting Comprehensive Income: Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”). ASU 2018-02 was issued to address certain stranded tax effects in accumulated other comprehensive income as a result of the Tax Cuts and Jobs Act of 2017. The ASU provides companies the option to reclassify stranded tax effects within AOCI to retained earnings in each period in which the effect of the change from the newly enacted corporate tax rate is recorded. The amount of the reclassification would be calculated on the basis of the difference between the historical and newly enacted tax rates for deferred tax liabilities and assets related to items within accumulated other comprehensive income. ASU 2018-02 requires companies to disclose its accounting policy related to releasing income tax effects from AOCI, whether it has elected to reclassify the stranded tax effects, and information about the other income tax effects that are reclassified. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods, therein, and early adoption is permitted for public business entities for which financial statements have not yet been issued. As of December 31, 2017, the Company adopted ASU 2018-02 and made a reclassification adjustment from accumulated other comprehensive income to retained earnings on the Consolidated Statements of Changes in Shareholders' Equity, related to the stranded tax effects due to the change in the federal corporate tax rate applied on the unrealized gains (losses) on investments on a portfolio basis, to reflect the provisions of this ASU.

Summary of Significant Accoun36

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Calculation of Earnings Per Share	Information used to calculate earnings per share was as follows: (In Thousands) 2017 2016 2015 Net income attributable to Northrim BanCorp, Inc. $13,151 $14,411 $17,783 Basic weighted average common shares outstanding 6,890 6,884 6,859 Dilutive effect of potential common shares from awards granted under equity incentive program 88 91 89 Total 6,978 6,975 6,948 Earnings per common share Basic $1.91 $2.09 $2.59 Diluted $1.88 $2.06 $2.56

Interest Bearing Deposits in 37

Interest Bearing Deposits in Other Banks (Tables)	12 Months Ended
	Dec. 31, 2017
Interest Bearing Deposits In Other Banks [Abstract]
Interest Bearing Deposits in Other Banks	Balances at December 31 for the respective years are as follows: (In Thousands) 2017 2016 Interest bearing deposits at Federal Reserve Bank $52,083 $15,734 Interest bearing deposits at FHLB 41 31 Other interest bearing deposits at other institutions 701 301 Total $52,825 $16,066

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2017
Marketable Securities [Abstract]
Summary of Investment Security Carrying and Fair Value	The carrying values and approximate fair values of investment securities at the periods indicated are presented below: (In Thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value December 31, 2017 Securities available for sale U.S. Treasury and government sponsored entities $250,794 $3 $1,336 $249,461 Municipal securities 14,395 72 46 14,421 Corporate bonds 36,654 478 — 37,132 Collateralized loan obligations 6,000 5 — 6,005 Preferred stock 5,422 338 29 5,731 Total securities available for sale $313,265 $896 $1,411 $312,750 December 31, 2016 Securities available for sale U.S. Treasury and government sponsored entities $264,267 $150 $1,056 $263,361 Municipal securities 18,184 26 53 18,157 U.S. Agency mortgage-backed securities 2 — — 2 Corporate bonds 44,437 295 — 44,732 Preferred stock 4,922 49 4 4,967 Total securities available for sale $331,812 $520 $1,113 $331,219 Securities held to maturity Municipal securities $899 $23 $— $922 Total securities held to maturity $899 $23 $— $922
Schedule of Gross Unrealized Losses on Investment Securities	Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2017 and 2016 , were as follows: Less Than 12 Months More Than 12 Months Total (In Thousands) Fair Unrealized Losses Fair Unrealized Losses Fair Unrealized Losses 2017: Securities Available for Sale U.S. Treasury and government sponsored entities $116,331 $496 $122,605 $840 $238,936 $1,336 Municipal securities 3,994 17 2,298 29 6,292 46 Preferred stock 1,013 29 — — 1,013 29 Total $121,338 $542 $124,903 $869 $246,241 $1,411 2016: Securities Available for Sale U.S. Treasury and government sponsored entities $180,638 $1,051 $489 $5 $181,127 $1,056 Municipal securities 11,533 33 1,786 20 13,319 53 Preferred stock — — 1,038 4 1,038 4 Total $192,171 $1,084 $3,313 $29 $195,484 $1,113
Schedule of Amortized Cost and Fair Value by Contractual Maturity	The amortized cost and fair values of debt securities at December 31, 2017 , are distributed by contractual maturity as shown below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Although preferred stock has no stated maturity, it is aggregated in the calculation of weighted average yields presented below in the category of investments that mature in ten years or more. (In Thousands) Amortized Cost Fair Value Weighted Average Yield U.S. Treasury and government sponsored entities Within 1 year $113,087 $112,755 1.08 % 1-5 years $137,707 $136,706 1.63 % Total $250,794 $249,461 1.38 % Corporate bonds Within 1 year $4,500 $4,504 2.10 % 1-5 years 21,704 21,952 2.14 % 5-10 years 10,450 10,676 2.58 % Total $36,654 $37,132 2.26 % Collateralized loan obligations 5-10 years $3,000 $3,000 3.03 % Over 10 years 3,000 3,005 3.09 % Total $6,000 $6,005 3.06 % Preferred stock Over 10 years $5,422 $5,731 6.37 % Total $5,422 $5,731 6.37 % Municipal securities Within 1 year $3,730 $3,728 1.64 % 1-5 years 10,665 10,693 2.66 % Total $14,395 $14,421 2.40 %
Schedule of Available-For-Sale Securities Proceeds, Gains, and Losses	The proceeds and resulting gains and losses, computed using specific identification, from sales of investment securities for the years ending December 31, 2017 , 2016 , and 2015 , respectively, are as follows: (In Thousands) Proceeds Gross Gains Gross Losses 2017 Available for sale securities $25,006 $14 $3 2016 Available for sale securities $5,785 $12 $23 2015 Available for sale securities $20,522 $271 $—
Summary of Interest Income on Available-For-Sale Investment Securities	A summary of interest income for the years ending December 31, 2017 , 2016 , and 2015 on available for sale investment securities is as follows: (In Thousands) 2017 2016 2015 U.S. Treasury and government sponsored entities $2,983 $2,661 $2,378 U.S. Agency mortgage-backed securities — 4 25 Other 1,225 948 670 Total taxable interest income $4,208 $3,613 $3,073 Municipal securities $367 $282 $320 Total tax-exempt interest income $367 $282 $320 Total $4,575 $3,895 $3,393

Loans and Credit Quality (Table

Loans and Credit Quality (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loan Portfolio Segmented By Risk Class	The composition of the loan portfolio as of the periods indicated is as follows: (In Thousands) Commercial Real estate construction one-to-four family Real estate construction other Real estate term owner occupied Real estate term non-owner occupied Real estate term other Consumer secured by 1st deeds of trust Consumer other Total December 31, 2017 AQR Pass $277,626 $31,201 $80,093 $127,115 $307,926 $39,777 $22,103 $19,895 $905,736 AQR Special Mention 4,921 — — 2,095 11,051 634 3 22 18,726 AQR Substandard 31,222 — — 2,888 482 — 767 2 35,361 Subtotal $313,769 $31,201 $80,093 $132,098 $319,459 $40,411 $22,873 $19,919 $959,823 Less: Unearned origination fees, net of origination costs (4,156 ) Total loans $955,667 December 31, 2016 AQR Pass $257,639 $26,061 $72,159 $135,359 $355,903 $44,733 $22,568 $25,151 $939,573 AQR Special Mention 1,950 — — 57 — — 501 78 2,586 AQR Substandard 18,589 — — 16,762 698 669 520 52 37,290 Subtotal $278,178 $26,061 $72,159 $152,178 $356,601 $45,402 $23,589 $25,281 $979,449 Less: Unearned origination fees, net of origination costs (4,434 ) Total loans $975,015
Nonaccrual Loans By Segment	Nonaccrual loans at the periods indicated, by segment are presented below: (In Thousands) 30-59 Days 60-89 Days Greater Than Current Total December 31, 2017 Commercial $810 $— $2,652 $16,455 $19,917 Real estate term owner occupied — — — 1,331 1,331 Consumer secured by 1st deeds of trust — — 378 — 378 Total nonaccrual loans 810 — 3,030 17,786 21,626 Government guarantees on nonaccrual loans — — (94 ) (373 ) (467 ) Net nonaccrual loans $810 $— $2,936 $17,413 $21,159 December 31, 2016 Commercial $8,750 $— $4,208 $542 $13,500 Real estate term owner occupied — — — 29 29 Real estate term non-owner occupied — — — 197 197 Consumer secured by 1st deeds of trust — — 167 — 167 Total nonaccrual loans 8,750 — 4,375 768 13,893 Government guarantees on nonaccrual loans — — (1,413 ) — (1,413 ) Net nonaccrual loans $8,750 $— $2,962 $768 $12,480
Past Due Loans And Nonaccrual Loans	Past due loans and nonaccrual loans at the periods indicated are presented below by loan class: (In Thousands) 30-59 Days Past Due Still Accruing 60-89 Days Past Due Still Accruing Greater Than 90 Days Still Accruing Total Past Nonaccrual Current Total December 31, 2017 Commercial $503 $— $240 $743 $19,917 $293,109 $313,769 Real estate construction one-to-four family — — — — — 31,201 31,201 Real estate construction other 90 — — 90 — 80,003 80,093 Real estate term owner occupied 966 — — 966 1,331 129,801 132,098 Real estate term non-owner occupied — — — — — 319,459 319,459 Real estate term other — — — — — 40,411 40,411 Consumer secured by 1st deed of trust 363 — — 363 378 22,132 22,873 Consumer other 161 53 12 226 — 19,693 19,919 Subtotal $2,083 $53 $252 $2,388 $21,626 $935,809 $959,823 Less: Unearned origination fees, net of origination costs (4,156 ) Total $955,667 December 31, 2016 Commercial $— $141 $404 $545 $13,500 $264,133 $278,178 Real estate construction one-to-four family — — — — — 26,061 26,061 Real estate construction other — — — — — 72,159 72,159 Real estate term owner occupied 887 — — 887 29 151,262 152,178 Real estate term non-owner occupied — — — — 197 356,404 356,601 Real estate term other — — — — — 45,402 45,402 Consumer secured by 1st deed of trust 390 518 — 908 167 22,514 23,589 Consumer other 171 80 52 303 — 24,978 25,281 Subtotal $1,448 $739 $456 $2,643 $13,893 $962,913 $979,449 Less: Unearned origination fees, net of origination costs (4,434 ) Total $975,015
Impaired Loans	The following table presents information about impaired loans by class for the years ended December 31, 2017 and 2016 : (In Thousands) Recorded Investment Unpaid Principal Balance Related Allowance December 31, 2017 With no related allowance recorded Commercial - AQR special mention $2,153 $2,153 $— Commercial - AQR substandard 16,671 17,742 — Real estate term owner occupied - AQR substandard 2,862 2,862 — Real estate term non-owner occupied - AQR pass 303 303 — Real estate term non-owner occupied - AQR special mention 89 89 — Real estate term non-owner occupied - AQR substandard 482 482 — Real estate term other - AQR pass 559 559 — Consumer secured by 1st deeds of trust - AQR pass 136 136 — Consumer secured by 1st deeds of trust - AQR substandard 724 809 — Subtotal $23,979 $25,135 $— With an allowance recorded Commercial - AQR substandard $7,988 $7,988 $966 Subtotal $7,988 $7,988 $966 Commercial - AQR special mention $2,153 $2,153 $— Commercial - AQR substandard 24,659 25,730 966 Real estate term owner-occupied - AQR substandard 2,862 2,862 — Real estate term non-owner occupied - AQR pass 303 303 — Real estate term non-owner occupied - AQR special mention 89 89 — Real estate term non-owner occupied - AQR substandard 482 482 — Real estate term other - AQR pass 559 559 — Consumer secured by 1st deeds of trust - AQR pass 136 136 — Consumer secured by 1st deeds of trust - AQR substandard 724 809 — Total $31,967 $33,123 $966 (In Thousands) Recorded Investment Unpaid Principal Balance Related Allowance December 31, 2016 With no related allowance recorded Commercial - AQR special mention $223 $223 $— Commercial - AQR substandard 9,213 9,893 — Real estate term owner occupied - AQR pass 252 252 — Real estate term owner occupied - AQR substandard 16,694 16,694 — Real estate term non-owner occupied - AQR pass 391 391 — Real estate term non-owner occupied - AQR substandard 693 693 — Real estate term other - AQR pass 633 633 — Real estate term other - AQR substandard 669 669 — Consumer secured by 1st deeds of trust - AQR special mention 143 143 — Consumer secured by 1st deeds of trust - AQR substandard 472 488 — Consumer other - AQR substandard 52 52 — Subtotal $29,435 $30,131 $— With an allowance recorded Commercial - AQR substandard $9,221 $9,221 $614 Subtotal $9,221 $9,221 $614 Commercial - AQR special mention $223 $223 $— Commercial - AQR substandard 18,434 19,114 614 Real estate term owner-occupied - AQR pass 252 252 — Real estate term owner-occupied - AQR substandard 16,694 16,694 — Real estate term non-owner occupied - AQR pass 391 391 — Real estate term non-owner occupied - AQR substandard 693 693 — Real estate term other - AQR pass 633 633 — Real estate term other - AQR substandard 669 669 — Consumer secured by 1st deeds of trust - AQR special mention 143 143 — Consumer secured by 1st deeds of trust - AQR substandard 472 488 — Consumer other - AQR substandard 52 52 — Total $38,656 $39,352 $614 The unpaid principal balance included in the table above represents the recorded investment at the dates indicated, plus amounts charged-off for book purposes. The following table summarizes our average recorded investment and interest income recognized on impaired loans for years ended December 31, 2017 and 2016 , respectively: Year Ended December 31, 2017 2016 (In Thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded Commercial - AQR special mention $582 $1 $170 $13 Commercial - AQR substandard 19,521 487 15,522 840 Real estate construction one-to-four family - AQR substandard — — 988 — Real estate construction other - AQR substandard — — 1,431 — Real estate term owner occupied - AQR pass 62 5 378 34 Real estate term owner occupied - AQR substandard 5,402 286 16,551 1,202 Real estate term non-owner occupied - AQR pass 354 43 442 91 Real estate term non-owner occupied - AQR special mention 23 2 — — Real estate term non-owner occupied - AQR substandard 611 45 599 28 Real estate term other - AQR pass 595 42 627 58 Real estate term other - AQR special mention — — 43 4 Real estate term other - AQR substandard 487 34 683 55 Consumer secured by 1st deeds of trust - AQR pass 35 3 38 2 Consumer secured by 1st deeds of trust - AQR special mention 105 10 36 3 Consumer secured by 1st deeds of trust - AQR substandard 561 17 568 24 Consumer other - AQR substandard 13 1 13 — Subtotal $28,351 $976 $38,089 $2,354 With an allowance recorded Commercial - AQR special mention $525 $3 $— $— Commercial - AQR substandard 8,019 4 2,451 $— Real estate construction one-to-four family - AQR substandard — — 1,986 — Consumer secured by 1st deeds of trust - AQR substandard — — 73 — Subtotal $8,544 $7 $4,510 $— Total Commercial - AQR special mention $1,107 $4 $170 $13 Commercial - AQR substandard 27,540 491 17,973 840 Real estate construction one-to-four family - AQR substandard — — 2,974 — Real estate construction other - AQR substandard — — 1,431 — Real estate term owner-occupied - AQR pass 62 5 378 34 Real estate term owner-occupied - AQR substandard 5,402 286 16,551 1,202 Real estate term non-owner occupied - AQR pass 354 43 442 91 Real estate term non-owner occupied - AQR special mention 23 2 — — Real estate term non-owner occupied - AQR substandard 611 45 599 28 Real estate term other - AQR pass 595 42 627 58 Real estate term other - AQR special mention — — 43 4 Real estate term other - AQR substandard 487 34 683 55 Consumer secured by 1st deeds of trust - AQR pass 35 3 38 2 Consumer secured by 1st deeds of trust - AQR special mention 105 10 36 3 Consumer secured by 1st deeds of trust - AQR substandard 561 17 641 24 Consumer other - AQR substandard 13 1 13 — Total Impaired Loans $36,895 $983 $42,599 $2,354
Newly Restructured Loans	The following table identifies the portion of TDR balances as of December 31, 2017 that were restructured during 2017 : Accrual Status Nonaccrual Status Total Modifications (In Thousands) New Troubled Debt Restructurings Commercial - AQR special mention $2,059 $— $2,059 Commercial - AQR substandard 202 8,349 8,551 Subtotal $2,261 $8,349 $10,610 Existing Troubled Debt Restructurings 5,407 7,830 13,237 Total $7,668 $16,179 $23,847
Newly Restructured Loans By Concession	The following table provides additional information about loans that were restructured in 2017 : (In Thousands) Number of Contracts Rate Modification Term Modification Payment Modification Combination Modification Total Modifications Pre-Modification Outstanding Recorded Investment: Commercial - AQR special mention 1 $— $2,078 $— $— $2,078 Commercial - AQR substandard 2 — 10,665 210 — 10,875 Total 3 $— $12,743 $210 $— $12,953 Post-Modification Outstanding Recorded Investment: Commercial - AQR special mention 1 $— $2,059 $— $— $2,059 Commercial - AQR substandard 2 — 8,349 202 — 8,551 Total 3 $— $10,408 $202 $— $10,610
Analysis Of Loan Transactions	An analysis of the loan transactions for the years indicated follows: (In Thousands) 2017 2016 Balance, beginning of the year $90 $117 Loans made — — Repayments 90 27 Balance, end of year $— $90

Allowance For Loan Losses (Tabl

Allowance For Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Allowance For Loan Losses	The following table details activity in the Allowance for the periods indicated: (In Thousands) Commercial Real estate construction one-to-four family Real estate construction other Real estate term owner occupied Real estate term non-owner occupied Real estate term other Consumer secured by 1st deed of trust Consumer other Unallocated Total 2017 Balance, beginning of period $5,535 $550 $1,465 $2,358 $6,853 $819 $313 $408 $1,396 $19,697 Charge-Offs (1,611 ) — — — — (5 ) (85 ) (43 ) — (1,744 ) Recoveries 293 — — — — 2 2 11 — 308 Provision (benefit) 1,955 79 101 (164 ) (810 ) (91 ) 85 (69 ) 2,114 3,200 Balance, end of period $6,172 $629 $1,566 $2,194 $6,043 $725 $315 $307 $3,510 $21,461 Balance, end of period: Individually evaluated for impairment $966 $— $— $— $— $— $— $— $— $966 Balance, end of period: Collectively evaluated for impairment $5,206 $629 $1,566 $2,194 $6,043 $725 $315 $307 $3,510 $20,495 2016 Balance, beginning of period $5,906 $854 $1,439 $1,657 $5,515 $628 $264 $397 $1,493 $18,153 Charge-Offs (903 ) (535 ) — — — — (36 ) (8 ) — (1,482 ) Recoveries 699 — — — — — — 29 — 728 Provision (benefit) (167 ) 231 26 701 1,338 191 85 (10 ) (97 ) 2,298 Balance, end of period $5,535 $550 $1,465 $2,358 $6,853 $819 $313 $408 $1,396 $19,697 Balance, end of period: Individually evaluated for impairment $614 $— $— $— $— $— $— $— $— $614 Balance, end of period: Collectively evaluated for impairment $4,921 $550 $1,465 $2,358 $6,853 $819 $313 $408 $1,396 $19,083 2015 Balance, beginning of period $5,643 $644 $1,653 $1,580 $4,704 $656 $285 $410 $1,148 $16,723 Charge-Offs (616 ) — — — — (81 ) (28 ) (101 ) — (826 ) Recoveries 379 — — — — 107 3 13 — 502 Provision (benefit) 500 210 (214 ) 77 811 (54 ) 4 75 345 1,754 Balance, end of period $5,906 $854 $1,439 $1,657 $5,515 $628 $264 $397 $1,493 $18,153 Balance, end of period: Individually evaluated for impairment $344 $— $— $— $— $— $— $— $— $344 Balance, end of period: Collectively evaluated for impairment $5,562 $854 $1,439 $1,657 $5,515 $628 $264 $397 $1,493 $17,809 The following table sets forth information regarding changes in the purchased receivable reserve for the periods indicated: (In Thousands) 2017 2016 2015 Balance at beginning of year $171 $181 $289 Charge-offs — — — Recoveries — — 30 Net recoveries (charge-offs) — — 30 Reserve for (recovery from) purchased receivables 29 (10 ) (138 ) Balance at end of year $200 $171 $181
Recorded Investment Segregated By Amounts Individually Or Collectively In Allowance For Loan Losses	The following is a detail of the recorded investment in the loan portfolio, segregated by amounts evaluated individually or collectively in the Allowance at the periods indicated: (In Thousands) Commercial Real estate construction one-to-four family Real estate construction other Real estate term owner occupied Real estate term non-owner occupied Real estate term other Consumer secured by 1st deed of trust Consumer other Total December 31, 2017 Balance, end of period $313,769 $31,201 $80,093 $132,098 $319,459 $40,411 $22,873 $19,919 $959,823 Balance, end of period: Individually evaluated for impairment $26,812 $— $— $2,862 $874 $559 $860 $— $31,967 Balance, end of period: Collectively evaluated for impairment $286,957 $31,201 $80,093 $129,236 $318,585 $39,852 $22,013 $19,919 $927,856 December 31, 2016 Balance, end of period $278,178 $26,061 $72,159 $152,178 $356,601 $45,402 $23,589 $25,281 $979,449 Balance, end of period: Individually evaluated for impairment $18,657 $— $— $16,946 $1,084 $1,302 $615 $52 $38,656 Balance, end of period: Collectively evaluated for impairment $259,521 $26,061 $72,159 $135,232 $355,517 $44,100 $22,974 $25,229 $940,793
Balance Of The Allowance Segregated By Segment And Class	The following represents the balance of the Allowance for the periods indicated segregated by segment and class: (In Thousands) Total Commercial Real estate construction 1-4 family Real estate construction other Real estate term owner occupied Real estate term non-owner occupied Real estate term other Consumer secured by 1st deeds of trust Consumer other Unallocated December 31, 2017 Individually evaluated for impairment AQR Substandard $966 $966 $— $— $— $— $— $— $— $— Collectively evaluated for impairment: AQR Pass 16,453 5,079 629 1,566 2,154 5,680 725 315 305 — AQR Special Mention 524 120 — — 40 363 — — 1 — AQR Substandard 8 7 — — — — — — 1 — Unallocated 3,510 — — — — — — — — 3,510 $21,461 $6,172 $629 $1,566 $2,194 $6,043 $725 $315 $307 $3,510 December 31, 2016 Individually evaluated for impairment: AQR Substandard $614 $614 $— $— $— $— $— $— $— $— Collectively evaluated for impairment: AQR Pass 17,628 4,867 550 1,465 2,358 6,853 819 310 406 — AQR Special Mention 56 51 — — — — — 3 2 — AQR Substandard 3 3 — — — — — — — — Unallocated 1,396 — — — — — — — — 1,396 $19,697 $5,535 $550 $1,465 $2,358 $6,853 $819 $313 $408 $1,396

Purchased Receivables (Tables)

Purchased Receivables (Tables)	12 Months Ended
	Dec. 31, 2017
Purchased Receivables [Abstract]
Summary of Components of Net Purchased Receivables	The following table summarizes the components of net purchased receivables at December 31, for the years indicated: (In Thousands) 2017 2016 Purchased receivables $22,431 $20,662 Reserve for purchased receivable losses (200 ) (171 ) Total $22,231 $20,491
Allowance For Loan Losses Purchased Receivables	The following table details activity in the Allowance for the periods indicated: (In Thousands) Commercial Real estate construction one-to-four family Real estate construction other Real estate term owner occupied Real estate term non-owner occupied Real estate term other Consumer secured by 1st deed of trust Consumer other Unallocated Total 2017 Balance, beginning of period $5,535 $550 $1,465 $2,358 $6,853 $819 $313 $408 $1,396 $19,697 Charge-Offs (1,611 ) — — — — (5 ) (85 ) (43 ) — (1,744 ) Recoveries 293 — — — — 2 2 11 — 308 Provision (benefit) 1,955 79 101 (164 ) (810 ) (91 ) 85 (69 ) 2,114 3,200 Balance, end of period $6,172 $629 $1,566 $2,194 $6,043 $725 $315 $307 $3,510 $21,461 Balance, end of period: Individually evaluated for impairment $966 $— $— $— $— $— $— $— $— $966 Balance, end of period: Collectively evaluated for impairment $5,206 $629 $1,566 $2,194 $6,043 $725 $315 $307 $3,510 $20,495 2016 Balance, beginning of period $5,906 $854 $1,439 $1,657 $5,515 $628 $264 $397 $1,493 $18,153 Charge-Offs (903 ) (535 ) — — — — (36 ) (8 ) — (1,482 ) Recoveries 699 — — — — — — 29 — 728 Provision (benefit) (167 ) 231 26 701 1,338 191 85 (10 ) (97 ) 2,298 Balance, end of period $5,535 $550 $1,465 $2,358 $6,853 $819 $313 $408 $1,396 $19,697 Balance, end of period: Individually evaluated for impairment $614 $— $— $— $— $— $— $— $— $614 Balance, end of period: Collectively evaluated for impairment $4,921 $550 $1,465 $2,358 $6,853 $819 $313 $408 $1,396 $19,083 2015 Balance, beginning of period $5,643 $644 $1,653 $1,580 $4,704 $656 $285 $410 $1,148 $16,723 Charge-Offs (616 ) — — — — (81 ) (28 ) (101 ) — (826 ) Recoveries 379 — — — — 107 3 13 — 502 Provision (benefit) 500 210 (214 ) 77 811 (54 ) 4 75 345 1,754 Balance, end of period $5,906 $854 $1,439 $1,657 $5,515 $628 $264 $397 $1,493 $18,153 Balance, end of period: Individually evaluated for impairment $344 $— $— $— $— $— $— $— $— $344 Balance, end of period: Collectively evaluated for impairment $5,562 $854 $1,439 $1,657 $5,515 $628 $264 $397 $1,493 $17,809 The following table sets forth information regarding changes in the purchased receivable reserve for the periods indicated: (In Thousands) 2017 2016 2015 Balance at beginning of year $171 $181 $289 Charge-offs — — — Recoveries — — 30 Net recoveries (charge-offs) — — 30 Reserve for (recovery from) purchased receivables 29 (10 ) (138 ) Balance at end of year $200 $171 $181

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2017
Real Estate [Abstract]
Net Operating Expense Related To Other Real Estate Owned	The following table details net operating expense related to OREO for the years indicated: Years Ended December 31, (In Thousands) 2017 2016 2015 OREO (income) expense, net rental income and gains on sale: OREO operating expense $420 $304 $224 Impairment on OREO 904 187 361 Rental income on OREO (116 ) (98 ) (80 ) Gains on sale of OREO (371 ) (295 ) (315 ) Total $837 $98 $190

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Premises and Equipment	The following summarizes the components of premises and equipment at December 31 for the years indicated: (In Thousands) Useful Life 2017 2016 Land $2,562 $2,596 Furniture and equipment 3-7 years 8,323 14,912 Tenant improvements 2-15 years 8,323 8,325 Buildings 39 years 38,114 37,683 Total Premises and Equipment 57,322 63,516 Accumulated depreciation and amortization (19,455 ) (24,198 ) Total Premises and Equipment, Net $37,867 $39,318

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2017
Transfers and Servicing [Abstract]
Servicing Asset at Fair Value	The following table outlines the key assumptions used in measuring the fair value of mortgage servicing rights as of December 31, 2017 and 2016: 2017 2016 Constant prepayment rate 9.00 % 11.58 % Discount rate 9.45 % 9.25 % The following table details the activity in the Company's mortgage servicing rights ("MSR") for the year indicated: (In Thousands) 2017 2016 Balance, beginning of period $4,157 $1,654 Additions for new MSR capitalized 3,146 3,029 Changes in fair value: Due to changes in model inputs of assumptions (1) 551 (214 ) Other (2) (549 ) (312 ) Carrying value, December 31 $7,305 $4,157 (1) Principally reflects changes in discount rates and prepayment speed assumptions, which are primarily affected by changes in interest rates. (2) Represents changes due to collection/realization of expected cash flows over time. The following table details information related to our serviced mortgage loan portfolio as of December 31, 2017 and 2016: (In Thousands) December 31, 2017 December 31, 2016 Balance of mortgage loans serviced for others $406,291 $272,442 MSR as a percentage of serviced loans 1.80 % 1.53 %

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets And Other Assets	A summary of goodwill and intangible assets at December 31, 2017 and 2016, is as follows: (In Thousands) 2017 2016 Intangible assets: Goodwill $15,017 $15,017 Core deposit intangible 257 357 Trade name intangible 950 950 Total $16,224 $16,324
Future Amortization Expense	The future amortization expense required on these assets is as follows: (In Thousands) 2018 $71 2019 59 2020 48 2021 37 2022 25 Thereafter 17 Total $257

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Assets	A summary of other assets as of December 31, 2017 and 2016, is as follows: (In Thousands) 2017 2016 Other assets: Investment in Low Income Housing Partnerships $21,908 $24,174 Deferred taxes, net 6,260 10,264 Taxes receivable 5,331 1,755 Bank owned life insurance 5,313 6,181 Software 5,270 219 Accrued interest receivable 4,385 3,734 Investment in equity method investments 3,878 4,560 Prepaid expenses 1,269 1,596 Rate lock derivative 873 1,137 Other assets 1,654 2,508 Total $56,141 $56,128
Other Commitments	The following table shows the Company's commitments to invest in various low income housing tax credit partnerships. The Company earns a return on its investments in the form of tax credits and deductions that flow through to it as a limited partner in these partnerships. The Company recognized amortization expense of $2.3 million , $2.9 million , and $2.7 million in 2017 , 2016 , and 2015 , respectively. The Company expects to fund its remaining $5.5 million in commitments on these investments through 2030. (In Thousands) Date of original commitment Years over which tax credits are earned Original commitment amount Less: life to date contributions Remaining commitment amount R4 - MVV May 2014 17 $8,528 ($8,248 ) $280 R4 - Coronado March 2013 17 10,729 (10,138 ) 591 R4 - PJ33 June 2016 17 6,809 (2,184 ) 4,625 WNC December 2012 16 2,500 (2,500 ) — USA 57 December 2006 15 3,000 (3,000 ) — Centerline XXXIII September 2006 18 3,000 (3,000 ) — Centerline XXII January 2003 18 3,000 (3,000 ) — Total $37,566 ($32,070 ) $5,496

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2017
Deposits [Abstract]
Schedule of Deposit Maturity	At December 31, 2017 , the scheduled maturities of certificates of deposit are as follows: (In Thousands) 2018 $66,013 2019 19,462 2020 12,008 2021 353 2022 806 Thereafter 1,885 Total $100,527
Schedule of Interest Expense on Deposit	Interest expense on deposits is presented below: (In Thousands) 2017 2016 2015 Interest-bearing demand accounts $21 $67 $63 Money market accounts 472 418 404 Savings accounts 520 489 470 Certificates of deposit $100,000 and greater 358 707 754 Certificates of deposit less than $100,000 336 189 248 Total $1,707 $1,870 $1,939

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Future Principal Payments Required On The Company's Borrowings	The future principal payments that are required on the Company’s borrowings as of December 31, 2017 , are as follows: (In Thousands) 2018 $27,867 2019 167 2020 173 2021 178 2022 184 Thereafter 6,539 Total $35,108

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments	The Company's required minimum rental payments on non-cancelable leases as of December 31, 2017 , are as follows: (In Thousands) 2018 $2,737 2019 2,313 2020 2,021 2021 1,967 2022 1,795 Thereafter 9,354 Total $20,187
Schedule of Future Minimum Lease Rentals	The Company's future required minimum rental receipts on non-cancelable leases as of December 31, 2017 , are as follows: (In Thousands) 2018 $657 2019 672 2020 686 2021 521 2022 166 Thereafter — Total $2,702
Standby Letters of Credit and Other Letters of Credit	The Company applies the same credit standards to these contracts as it uses in its lending process. (In Thousands) 2017 2016 Off-balance sheet commitments: Commitments to extend credit $283,937 $236,624 Commitments to originate loans held for sale $43,602 $62,421 Standby letters of credit $7,606 $9,931

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The following table presents the fair value of derivatives not designated as hedging instruments at December 31, 2017 and December 31, 2016 : (In Thousands) Asset Derivatives December 31, 2017 December 31, 2016 Balance Sheet Location Fair Value Fair Value Interest rate swaps Other assets $77 $71 Interest rate lock commitments Other assets 873 1,137 Total $950 $1,208 (In Thousands) Liability Derivatives December 31, 2017 December 31, 2016 Balance Sheet Location Fair Value Fair Value Interest rate swaps Other liabilities $77 $71 Retail interest rate contracts Other liabilities — 78 Total $77 $149
Derivative Instruments, Gain (Loss)	The following table presents the losses of derivatives not designated as hedging instruments at December 31, 2017 and 2016: (In Thousands) Income Statement Location December 31, 2017 December 31, 2016 Interest rate contracts Mortgage banking income ($420 ) ($530 ) Interest rate lock commitments Mortgage banking income (229 ) (367 ) Total ($649 ) ($897 )
Offsetting Assets	The following table summarizes the derivatives that have a right of offset as of December 31, 2017 and 2016: December 31, 2017 Gross amounts not offset in the Statement of Financial Position (In Thousands) Gross amounts of recognized assets and liabilities Gross amounts offset in the Statement of Financial Position Net amounts of assets and liabilities presented in the Statement of Financial Position Financial Instruments Collateral Posted Net Amount Asset Derivatives Interest rate swaps $77 $— $77 $— $— $77 Liability Derivatives Interest rate swaps $77 $— $77 $— $77 $— December 31, 2016 Gross amounts not offset in the Statement of Financial Position (In Thousands) Gross amounts of recognized assets and liabilities Gross amounts offset in the Statement of Financial Position Net amounts of assets and liabilities presented in the Statement of Financial Position Financial Instruments Collateral Posted Net Amount Asset Derivatives Interest rate swaps $71 $— $71 $— $— $71 Liability Derivatives Interest rate swaps $71 $— $71 $— $71 $— Retail interest rate contracts 78 — 78 — — 78
Offsetting Liabilities	The following table summarizes the derivatives that have a right of offset as of December 31, 2017 and 2016: December 31, 2017 Gross amounts not offset in the Statement of Financial Position (In Thousands) Gross amounts of recognized assets and liabilities Gross amounts offset in the Statement of Financial Position Net amounts of assets and liabilities presented in the Statement of Financial Position Financial Instruments Collateral Posted Net Amount Asset Derivatives Interest rate swaps $77 $— $77 $— $— $77 Liability Derivatives Interest rate swaps $77 $— $77 $— $77 $— December 31, 2016 Gross amounts not offset in the Statement of Financial Position (In Thousands) Gross amounts of recognized assets and liabilities Gross amounts offset in the Statement of Financial Position Net amounts of assets and liabilities presented in the Statement of Financial Position Financial Instruments Collateral Posted Net Amount Asset Derivatives Interest rate swaps $71 $— $71 $— $— $71 Liability Derivatives Interest rate swaps $71 $— $71 $— $71 $— Retail interest rate contracts 78 — 78 — — 78

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Assumptions Used To Determine Fair Value of Stock Options	The following assumptions were used to determine the fair value of stock options as of the grant date to determine compensation expense for the years ended December 31, 2017 , 2016 , and 2015 : Stock Options: 2017 2016 2015 Grant date fair value $6.70 $6.31 $7.01 Expected life of options 8 years 8 years 8 years Risk-free interest rate 2.29 % 2.15 % 2.17 % Dividend yield rate 2.64 % 2.85 % 2.64 % Price volatility 23.43 % 27.37 % 28.63 %
Stock Options Activity	The following table summarizes stock option activity during 2017 : Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Life, in Years Outstanding at January 1, 2017 173,757 $23.65 Granted 26,112 33.03 Forfeited (4,525 ) 23.00 Exercised (51,899 ) 19.72 Outstanding at December 31, 2017 143,445 $26.79 5.60
Restricted Stock Unit Activity	The following table summarizes restricted stock unit activity during 2017 : Number of Shares Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Life, in Years Outstanding at January 1, 2017 64,901 $28.04 Granted 23,967 33.12 Vested (19,727 ) 27.28 Forfeited (3,258 ) 28.28 Outstanding at December 31, 2017 65,883 $30.10 1.96

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2017
Regulatory Capital Requirements [Abstract]
Capital Requirements And Actual Capital Ratios	The tables below illustrate the capital requirements for the Company and the Bank and the actual capital ratios for each entity that exceed these requirements. The dividends that the Bank pays to the Company are limited to the extent necessary for the Bank to meet the regulatory requirements of a “well-capitalized” bank. The capital ratios for the Company exceed those for the Bank primarily because the $18 million trust preferred securities offerings that the Company completed in the second quarter of 2003 and in the fourth quarter of 2005 are included in the Company’s capital for regulatory purposes although they are accounted for as a liability in its financial statements. In the third quarter of 2017, the Company redeemed $8 million its trust preferred securities offerings. The trust preferred securities are not accounted for on the Bank’s financial statements nor are they included in its capital. As a result, the Company has $10 million and $18 million more in regulatory capital than the Bank at December 31, 2017 and 2016 , which explains most of the difference in the capital ratios for the two entities. Northrim BanCorp, Inc. Actual Adequately-Capitalized Well-Capitalized (In Thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2017: Common equity tier 1 capital (to risk-weighted assets) $177,005 13.89 % $57,345 ≥ 4.5 % NA NA Total Capital (to risk-weighted assets) $202,638 15.90 % $101,956 ≥ 8 % NA NA Tier I Capital (to risk-weighted assets) $186,637 14.65 % $76,438 ≥ 6 % NA NA Tier I Capital (to average assets) $186,637 12.41 % $60,157 ≥ 4 % NA NA As of December 31, 2016: Common equity tier 1 capital (to risk-weighted assets) $171,190 13.20 % $58,360 ≥ 4.5 % NA NA Total Capital (to risk-weighted assets) $204,927 15.80 % $103,761 ≥ 8 % NA NA Tier I Capital (to risk-weighted assets) $188,658 14.54 % $77,851 ≥ 6 % NA NA Tier I Capital (to average assets) $188,658 12.59 % $59,939 ≥ 4 % NA NA Northrim Bank Actual Adequately-Capitalized Well-Capitalized (In Thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2017: Common equity tier 1 capital (to risk-weighted assets) $161,996 12.83 % $56,819 ≥ 4.5 % $82,071 ≥ 6.5 % Total Capital (to risk-weighted assets) $177,857 14.08 % $101,055 ≥ 8 % $126,319 ≥ 10 % Tier I Capital (to risk-weighted assets) $161,996 12.83 % $75,758 ≥ 6 % $101,011 ≥ 8 % Tier I Capital (to average assets) $161,996 10.87 % $59,612 ≥ 4 % $74,515 ≥ 5 % As of December 31, 2016: Common equity tier 1 capital (to risk-weighted assets) $168,529 13.07 % $58,025 ≥ 4.5 % $83,813 ≥ 6.5 % Total Capital (to risk-weighted assets) $184,695 14.33 % $103,110 ≥ 8 % $128,887 ≥ 10 % Tier I Capital (to risk-weighted assets) $168,529 13.07 % $77,366 ≥ 6 % $103,155 ≥ 8 % Tier I Capital (to average assets) $168,529 11.30 % $59,656 ≥ 4 % $74,570 ≥ 5 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Components of The Provision For Income Taxes	Components of the provision for income taxes are as follows: (In Thousands) Current Tax Expense (Benefit) Deferred Expense (Benefit) Total Expense 2017: Federal $2,618 $3,658 $6,276 State 1,423 346 1,769 Amortization of investment in low income housing tax credit partnerships 2,276 — 2,276 Total $6,317 $4,004 $10,321 2016: Federal $2,874 ($281 ) $2,593 State 674 (83 ) 591 Amortization of investment in low income housing tax credit partnerships 2,868 — 2,868 Total $6,416 ($364 ) $6,052 2015: Federal $4,752 $127 $4,879 State 1,200 21 1,221 Amortization of investment in low income housing tax credit partnerships 2,684 — 2,684 Total $8,636 $148 $8,784
Reconciliation of Actual to Expected Tax Expense	The actual expense for 2017 , 2016 , and 2015 , differs from the “expected” tax expense (computed by applying the U.S. Federal Statutory Tax Rate of 35% for the year ended December 31, 2017 , 2016 , and 2015 ) as follows: (In Thousands) 2017 2016 2015 Computed “expected” income tax expense $8,330 $7,365 $9,491 State income taxes, net 1,225 384 794 Tax-exempt interest on investment securities (597 ) (566 ) (507 ) Amortization of investment in low income housing tax credit partnerships 2,276 2,868 2,684 Low income housing credits (3,468 ) (3,540 ) (2,446 ) Revaluation of deferred tax assets 2,678 — — Other (123 ) (459 ) (1,232 ) Total $10,321 $6,052 $8,784
Components of Net Deferred Tax Asset	The components of the net deferred tax asset are as follows: (In Thousands) 2017 2016 2015 Deferred Tax Asset: Allowance for loan losses $5,922 $7,717 $7,082 Loan fees, net of costs 825 1,823 1,896 Other real estate owned 160 123 46 Deferred compensation 1,218 2,112 2,005 Net operating loss carryforwards — — 73 Equity compensation 422 544 578 Loan discount 171 326 476 Fair market value adjustment on certificates of deposit 147 247 283 Unrealized loss on available for sale investment securities, net 59 195 235 Other 693 1,455 1,380 Total Deferred Tax Asset $9,617 $14,542 $14,054 Deferred Tax Liability: Intangible amortization ($219 ) ($2,804 ) ($2,494 ) Mortgage servicing rights (2,156 ) (415 ) (415 ) Depreciation and amortization (404 ) 31 (64 ) FHLB stock repurchase and dividends (179 ) (686 ) (686 ) Other (399 ) (404 ) (456 ) Total Deferred Tax Liability ($3,357 ) ($4,278 ) ($4,115 ) Net Deferred Tax Asset $6,260 $10,264 $9,939

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of Estimated Fair Values	Estimated fair values as of the periods indicated are as follows: December 31, 2017 December 31, 2016 (In Thousands) Carrying Amount Fair Value Carrying Amount Fair Value Financial assets: Level 1 inputs: Cash, due from banks and deposits in other banks $77,841 $77,841 $50,551 $50,551 Investment securities 59,117 59,117 43,486 43,486 Level 2 inputs: Investment securities 253,633 253,633 288,632 288,655 Investment in Federal Home Loan Bank Stock 2,115 2,115 1,965 1,965 Accrued interest receivable 4,385 4,385 3,734 3,734 Interest rate swaps 261 261 71 71 Level 3 inputs: Loans and loans held for sale 999,445 1,001,346 1,018,611 1,026,350 Purchased receivables, net 22,231 22,231 20,491 20,491 Interest rate lock commitments 873 873 1,137 1,137 Mortgage servicing rights 7,305 7,305 4,157 4,157 Financial liabilities: Level 2 inputs: Deposits $1,258,283 $1,257,670 $1,267,653 $1,266,995 Securities sold under repurchase agreements 27,746 27,746 27,607 27,607 Borrowings 7,362 7,308 4,338 4,186 Accrued interest payable 24 24 64 64 Interest rate swaps 77 77 71 71 Retail interest rate contracts — — 78 78 Level 3 inputs: Accrued liability, RML acquisition payments — — 186 186 Junior subordinated debentures 10,310 9,856 18,558 18,398
Schedule of Assets And Liabilities Measured At Fair Value On A Recurring Basis	The following table sets forth the balances as of the periods indicated of assets measured at fair value on a recurring basis: (In Thousands) Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2017 Assets: Available for sale securities U.S. Treasury and government sponsored entities $249,461 $49,878 $199,583 $— Municipal securities 14,421 — 14,421 — Corporate bonds 37,132 3,508 33,624 — Collateralized loan obligations 6,005 — 6,005 — Preferred stock 5,731 5,731 — — Total available for sale securities $312,750 $59,117 $253,633 $— Interest rate swaps $261 $— $261 $— Interest rate lock commitments 873 — — 873 Mortgage servicing rights 7,305 — — 7,305 Total other assets $8,439 $— $261 $8,178 Liabilities: Interest rate swaps $77 $— $77 $— Total other liabilities $77 $— $77 $— December 31, 2016 Assets: Available for sale securities U.S. Treasury and government sponsored entities $263,361 $30,063 $233,298 $— Municipal securities 18,157 — 18,157 — U.S. Agency mortgage-backed securities 2 — 2 — Corporate bonds 44,732 8,456 36,276 — Preferred stock 4,967 4,967 — — Total available for sale securities $331,219 $43,486 $287,733 $— Interest rate swaps $71 $— $71 $— Interest rate lock commitments 1,137 — — 1,137 Mortgage servicing rights 4,157 — — 4,157 Total other assets $5,365 $— $71 $5,294 Liabilities: Interest rate swaps $71 $— $71 $— Retail interest rate contracts 78 — 78 — Total other liabilities $149 $— $149 $—
Fair Value, Assets Measured on Recurring Basis	The following table provides a reconciliation of the assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the years ended December 31, 2017 and 2016 : (In Thousands) Beginning balance Change included in earnings Purchases and issuances Sales and settlements Ending balance December 31, 2017 Interest rate lock commitments $1,137 ($1,615 ) $15,084 ($13,733 ) $873 Mortgage servicing rights 4,157 2 3,146 — 7,305 Total $5,294 ($1,613 ) $18,230 ($13,733 ) $8,178 December 31, 2016 Interest rate lock commitments $1,514 ($2,063 ) $20,612 ($18,926 ) $1,137 Mortgage servicing rights 1,654 (526 ) 3,029 — 4,157 Total $3,168 ($2,589 ) $23,641 ($18,926 ) $5,294
Fair Value, Assets Measured on Nonrecurring Basis	During 2017 and 2016 , no impairment or valuation adjustment was recognized for assets recognized at fair value on a nonrecurring basis, except for certain assets as shown in the following table. For loans measured for impairment, the Company classifies fair value measurements using observable inputs, such as external appraisals, as Level 2 valuations in the fair value hierarchy, and unobservable inputs, such as in-house evaluations, as Level 3 valuations in the fair value hierarchy. (In Thousands) Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2017 Loans measured for impairment $7,988 $— $— $7,988 Other real estate owned 3,927 — — 3,927 Other assets - equity method investment 2,292 — — 2,292 Total $14,207 $— $— $14,207 December 31, 2016 Loans measured for impairment $9,222 $— $— $9,222 Other real estate owned 1,700 — — 1,700 Total $10,922 $— $— $10,922 The following table presents the losses resulting from nonrecurring fair value adjustments for the periods ended December 31, 2017 and 2016, respectively: (In Thousands) 2017 2016 2015 Loans measured for impairment $352 $270 $269 Other real estate owned 904 187 361 Other operating expense - impairment on equity method investment 686 — — Total loss from nonrecurring measurements $1,942 $457 $630
Schedule of Valuation Assumptions	The following table provides a description of the valuation technique, unobservable input, and qualitative information about the unobservable inputs for the Company’s assets and liabilities classified as Level 3 and measured at fair value on a nonrecurring basis at December 31, 2017 and 2016: Financial Instrument Valuation Technique Unobservable Input Weighted Average or Rate Range December 31, 2017 Loans measured for impairment In-house valuation of collateral Discount rate 32% - 40% Discounted cash flow Discount rate 7 % Other real estate owned Fair value of collateral Estimated capital costs to complete improvements 25% - 32% Interest rate lock commitment External pricing model Pull through rate 93.05 % Mortgage servicing rights Discounted cash flow Constant prepayment rate 8.94% - 11.34% Discount rate 9.42% - 10.05% December 31, 2016 Loans measured for impairment In-house valuation of collateral Discount rate 49% - 100% Discounted cash flow Discount rate 7 % Other real estate owned Fair value of collateral Estimated capital costs to complete improvements 11.50% - 25% Interest rate lock commitment External pricing model Pull through rate 93 % Mortgage servicing rights Discounted cash flow Constant prepayment rate 11.2% - 21.29% Discount rate 9.21% - 10.75%

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Schedule of Segment Information	Summarized financial information for the Company's reportable segments and the reconciliation to the consolidated financial results is shown in the following tables: December 31, 2017 (In Thousands) Community Banking Home Mortgage Lending Consolidated Interest income $58,308 $1,800 $60,108 Interest expense 1,860 570 2,430 Net interest income 56,448 1,230 57,678 Provision for loan losses 3,200 — 3,200 Other operating income 17,187 23,287 40,474 Compensation expense - RML acquisition payments 130 — 130 Other operating expense 50,271 20,752 71,023 Income before provision for income taxes 20,034 3,765 23,799 Provision for income taxes 9,499 822 10,321 Net income 10,535 2,943 13,478 Less: net income attributable to the noncontrolling interest 327 — 327 Net income attributable to Northrim BanCorp, Inc. $10,208 $2,943 $13,151 Total assets $1,453,115 $65,994 $1,519,109 Loans held for sale $— $43,778 $43,778 December 31, 2016 (In Thousands) Community Banking Home Mortgage Lending Consolidated Interest income $56,986 $1,932 $58,918 Interest expense 1,739 822 2,561 Net interest income 55,247 1,110 56,357 Provision for loan losses 2,298 — 2,298 Other operating income 13,756 29,507 43,263 Compensation expense, RML acquisition payments 4,775 — 4,775 Other operating expense 48,610 22,895 71,505 Income before provision for income taxes 13,320 7,722 21,042 Provision for income taxes 2,867 3,185 6,052 Net income 10,453 4,537 14,990 Less: net income attributable to the noncontrolling interest 579 — 579 Net income attributable to Northrim BanCorp, Inc. $9,874 $4,537 $14,411 Total assets $1,459,950 $66,590 $1,526,540 Loans held for sale $— $43,596 $43,596 December 31, 2015 (In Thousands) Community Banking Home Mortgage Lending Consolidated Interest income $57,729 $2,051 $59,780 Interest expense 1,796 1,075 2,871 Net interest income 55,933 976 56,909 Provision (benefit) for loan losses 1,754 — 1,754 Other operating income 14,995 29,613 44,608 Compensation expense, RML acquisition payments 4,094 — 4,094 Other operating expense 47,070 21,481 68,551 Income before provision for income taxes 18,010 9,108 27,118 Provision for income taxes 5,024 3,760 8,784 Net income 12,986 5,348 18,334 Less: net income attributable to the noncontrolling interest 551 — 551 Net income attributable to Northrim BanCorp, Inc. $12,435 $5,348 $17,783 Total assets $1,431,759 $67,733 $1,499,492 Loans held for sale $— $50,553 $50,553

Parent Company Information (Tab

Parent Company Information (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Balance Sheets	Balance Sheets at December 31, 2017 2016 (In Thousands) Assets Cash and cash equivalents $15,872 $11,963 Investment securities available for sale 5,731 4,967 Investment in Northrim Bank 177,824 184,511 Investment in NISC 1,469 1,487 Investment in NCT1 — 248 Investment in NST2 310 310 Other assets 1,951 2,248 Total Assets $203,157 $205,734 Liabilities Junior subordinated debentures $10,310 $18,558 Other liabilities 45 582 Total Liabilities 10,355 19,140 Shareholders' Equity Common stock 6,872 6,898 Additional paid-in capital 61,793 62,952 Retained earnings 124,322 117,141 Accumulated other comprehensive loss (185 ) (397 ) Total Shareholders' Equity 192,802 186,594 Total Liabilities and Shareholders' Equity $203,157 $205,734
Statements of Income	Statements of Income for Years Ended: 2017 2016 2015 (In Thousands) Income Interest income $408 $369 $116 Equity in undistributed earnings from Northrim Bank 14,003 15,301 18,865 Equity in undistributed earnings from NISC 122 95 140 Other income 52 — 175 Total Income $14,585 $15,765 $19,296 Expense Interest expense 516 534 463 Administrative and other expenses 2,242 2,382 2,191 Total Expense 2,758 2,916 2,654 Income Before Benefit from Income Taxes 11,827 12,849 16,642 Benefit from income taxes (1,324 ) (1,562 ) (1,141 ) Net Income $13,151 $14,411 $17,783
Statements of Cash Flows	Statements of Cash Flows for Years Ended: 2017 2016 2015 (In Thousands) Operating Activities: Net income $13,151 $14,411 $17,783 Adjustments to Reconcile Net Income to Net Cash: Equity in undistributed earnings from subsidiaries (14,101 ) (15,396 ) (19,005 ) Stock-based compensation 665 778 608 Changes in other assets and liabilities 176 (1,458 ) (298 ) Net Cash Used from Operating Activities (109 ) (1,665 ) (912 ) Investing Activities: Purchases of investment securities available for sale (499 ) (1,373 ) (3,549 ) Proceeds from sales/calls/maturities of securities available for sale — — 2,998 Investment in Northrim Bank, NISC, NCT1 & NST2 11,989 10,115 9,842 Net Cash Provided by Investing Activities 11,490 8,742 9,291 Financing Activities: Dividends paid to shareholders (5,965 ) (5,372 ) (5,117 ) Proceeds from issuance of common stock and excess tax benefits 100 — 106 Repurchase of common stock (1,607 ) — — Net Cash Used from Financing Activities (7,472 ) (5,372 ) (5,011 ) Net change in Cash and Cash Equivalents 3,909 1,705 3,368 Cash and Cash Equivalents at beginning of year 11,963 10,258 6,890 Cash and Cash Equivalents at end of year $15,872 $11,963 $10,258

Quarterly Results of Operatio57

Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Data [Abstract]
Quarterly Results of Operations	2017 Quarter Ended Dec. 31 Sept. 30 June 30 March 31 (In Thousands Except Per Share Amounts) Total interest income $15,232 $15,519 $14,892 $14,465 Total interest expense 548 602 648 632 Net interest income 14,684 14,917 14,244 13,833 Provision for loan losses — 2,500 300 400 Other operating income 7,952 13,855 9,762 8,905 Compensation expense, RML acquisition payments (193 ) 149 — 174 Other operating expense 18,530 17,542 18,510 16,441 Income before provision for income taxes 4,299 8,581 5,196 5,723 Provision for income taxes 4,085 2,980 1,455 1,801 Net Income 214 5,601 3,741 3,922 Less: Net income attributable to the noncontrolling interest — 78 152 97 Net income attributable to Northrim Bancorp, Inc. $214 $5,523 $3,589 $3,825 Earnings per share, basic $0.03 $0.80 $0.52 $0.55 Earnings per share, diluted $0.03 $0.79 $0.51 $0.55 2016 Quarter Ended Dec. 31 Sept. 30 June 30 March 31 (In Thousands Except Per Share Amounts) Total interest income $14,522 $14,860 $14,718 $14,818 Total interest expense 631 647 639 644 Net interest income 13,891 14,213 14,079 14,174 Provision for loan losses 743 652 200 703 Other operating income 10,359 11,935 11,864 9,105 Compensation expense, RML acquisition payments 708 3,250 687 130 Other operating expense 17,646 17,936 18,682 17,241 Income before provision for income taxes 5,153 4,310 6,374 5,205 Provision for income taxes 1,458 1,027 1,868 1,699 Net Income 3,695 3,283 4,506 3,506 Less: Net income attributable to the noncontrolling interest 105 188 156 130 Net income attributable to Northrim Bancorp, Inc. $3,590 $3,095 $4,350 $3,376 Earnings per share, basic $0.52 $0.45 $0.63 $0.49 Earnings per share, diluted $0.51 $0.44 $0.63 $0.48

Summary of Significant Accoun58

Summary of Significant Accounting Policies - Narrative (Details)	Dec. 01, 2014USD ($)owner	Dec. 31, 2017USD ($)trustborrower	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2017USD ($)segmenttrustborrowershares	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)shares	Jun. 30, 2016USD ($)
Accounting Policy [Line Items]
Number of wholly-owned Trusts | trust		1									1
Number of operating segments | segment											2
Maturity period of securities at acquisition											90 days
Threshold for nonperforming loans individually evaluated for impairment											$ 50,000
Loan loss history used											5 years
Average holding of purchased receivables											1 year
Advertising, promotion and marketing expenses											$ 2,566,000	$ 2,449,000	$ 2,728,000
Anti-dilutive shares (in shares) | shares											0	0	54,903
Commercial and construction loans		$ 425,100,000				$ 376,400,000				$ 376,400,000	$ 425,100,000	$ 376,400,000
Large borrowing relationships | borrower		26									26
Unfunded commitments to large borrowers		$ 99,100,000									$ 99,100,000
Goodwill		15,017,000				15,017,000				15,017,000	15,017,000	15,017,000
Compensation expense - RML acquisition payments		(193,000)	$ 149,000	$ 0	$ 174,000	708,000	$ 3,250,000	$ 687,000	$ 130,000		130,000	4,775,000	$ 4,094,000
Reduction in net income		$ (214,000)	$ (5,601,000)	$ (3,741,000)	$ (3,922,000)	$ (3,695,000)	$ (3,283,000)	$ (4,506,000)	$ (3,506,000)		(13,478,000)	(14,990,000)	$ (18,334,000)
RML
Accounting Policy [Line Items]
Number of former equity owners | owner	4
Voting interests acquired	76.50%
Number of former equity owners with continuing employment contracts | owner	3
Number of former equity owners that must continue employment under terms of acquisition agreement | owner	2
Accrued compensation expense related to acquisition payments											$ 0
Accounting for Payments Made to Former Equity Owners | RML
Accounting Policy [Line Items]
Total purchase price	$ 22,200,000
Goodwill	7,500,000
Accounting for Payments Made to Former Equity Owners | Previously Reported | RML
Accounting Policy [Line Items]
Total purchase price	29,500,000
Goodwill	$ 14,800,000
Accounting for Payments Made to Former Equity Owners | Restatement Adjustment | RML
Accounting Policy [Line Items]
Compensation expense - RML acquisition payments										765,000				$ 2,300,000
Reduction in net income										$ 438,000		$ 1,800,000		$ 1,400,000
Lender Concentration Risk
Accounting Policy [Line Items]
Concentration risk, percent											36.00%
Buildings
Accounting Policy [Line Items]
Premises and equipment, useful life											39 years
Minimum | Furniture And Equipment
Accounting Policy [Line Items]
Premises and equipment, useful life											3 years
Minimum | Leasehold Improvements
Accounting Policy [Line Items]
Premises and equipment, useful life											2 years
Maximum | Furniture And Equipment
Accounting Policy [Line Items]
Premises and equipment, useful life											7 years
Maximum | Leasehold Improvements
Accounting Policy [Line Items]
Premises and equipment, useful life											15 years
Northrim Benefits Group
Accounting Policy [Line Items]
Equity interest percentage		50.10%									50.10%

Summary of Significant Accoun59

Summary of Significant Accounting Policies - Calculation Of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Net income attributable to Northrim BanCorp, Inc.	$ 214	$ 5,523	$ 3,589	$ 3,825	$ 3,590	$ 3,095	$ 4,350	$ 3,376	$ 13,151	$ 14,411	$ 17,783
Basic weighted average common shares outstanding (in shares)									6,889,621	6,883,663	6,859,209
Dilutive effect of potential common shares from awards granted under equity incentive program (in shares)									88,000	91,000	89,000
Total (in shares)									6,977,910	6,974,864	6,948,474
Earnings per common share
Basic (in USD per share)	$ 0.03	$ 0.80	$ 0.52	$ 0.55	$ 0.52	$ 0.45	$ 0.63	$ 0.49	$ 1.91	$ 2.09	$ 2.59
Diluted (in USD per share)	$ 0.03	$ 0.79	$ 0.51	$ 0.55	$ 0.51	$ 0.44	$ 0.63	$ 0.48	$ 1.88	$ 2.06	$ 2.56

Cash and Due from Banks (Detail

Cash and Due from Banks (Details)	12 Months Ended
	Dec. 31, 2017USD ($)
Cash and Due from Banks [Abstract]
Minimum average daily balance	$ 710,000
Compensating Balances [Line Items]
Required balance	500,000
Compensating balance, initial margin on interest rate swap	100,000
Compensating balance, fair value exposure on interest rate swap	300,000
Federal Reserve Bank
Compensating Balances [Line Items]
Required balance	$ 0

Interest Bearing Deposits in 61

Interest Bearing Deposits in Other Banks (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Interest Bearing Deposits In Other Banks [Abstract]
Maximum maturity period	1 year
Interest bearing deposits at Federal Reserve Bank	$ 52,083	$ 15,734
Interest bearing deposits at FHLB	41	31
Other interest bearing deposits at other institutions	701	301
Total	$ 52,825	$ 16,066

Investment Securities - Summar

Investment Securities - Summary of Investment Security Carrying and Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 313,265	$ 331,812
Gross Unrealized Gains	896	520
Gross Unrealized Losses	1,411	1,113
Fair Value	312,750	331,219
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0	899
Gross Unrealized Gains		23
Gross Unrealized Losses		0
Fair Value		922
U.S. Treasury and government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	250,794	264,267
Gross Unrealized Gains	3	150
Gross Unrealized Losses	1,336	1,056
Fair Value	249,461	263,361
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,395	18,184
Gross Unrealized Gains	72	26
Gross Unrealized Losses	46	53
Fair Value	14,421	18,157
U.S. Agency mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		2
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,654	44,437
Gross Unrealized Gains	478	295
Gross Unrealized Losses	0	0
Fair Value	37,132	44,732
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,000
Gross Unrealized Gains	5
Gross Unrealized Losses	0
Fair Value	6,005
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,422	4,922
Gross Unrealized Gains	338	49
Gross Unrealized Losses	29	4
Fair Value	$ 5,731	4,967
Municipal securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		899
Gross Unrealized Gains		23
Gross Unrealized Losses		0
Fair Value		$ 922

Investment Securities - Schedu

Investment Securities - Schedule of Gross Unrealized Losses on Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 121,338	$ 192,171
Less than 12 months, unrealized losses	542	1,084
More than 12 months, fair value	124,903	3,313
More than 12 months, unrealized losses	869	29
Total, fair value	246,241	195,484
Total, unrealized losses	1,411	1,113
U.S. Treasury and government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	116,331	180,638
Less than 12 months, unrealized losses	496	1,051
More than 12 months, fair value	122,605	489
More than 12 months, unrealized losses	840	5
Total, fair value	238,936	181,127
Total, unrealized losses	1,336	1,056
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	3,994	11,533
Less than 12 months, unrealized losses	17	33
More than 12 months, fair value	2,298	1,786
More than 12 months, unrealized losses	29	20
Total, fair value	6,292	13,319
Total, unrealized losses	46	53
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	1,013	0
Less than 12 months, unrealized losses	29	0
More than 12 months, fair value	0	1,038
More than 12 months, unrealized losses	0	4
Total, fair value	1,013	1,038
Total, unrealized losses	$ 29	$ 4

Investment Securities - Narrat

Investment Securities - Narrative (Details) $ in Millions	Dec. 31, 2017USD ($)security	Dec. 31, 2016USD ($)security
Marketable Securities [Abstract]
Securities with unrealized losses	24	34
Positions in unrealized loss for greater than one year	17	4
Pledged securities | $	$ 51.6	$ 50.9

Investment Securities - Sche65

Investment Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity of Available-For-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 313,265	$ 331,812
U.S. Treasury and government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Within 1 year, amortized cost	113,087
1-5 years, amortized cost	137,707
Amortized Cost	250,794	264,267
Within 1 year, fair value	112,755
1-5 years, fair value	136,706
Fair Value	$ 249,461
Within 1 year, weighted average yield	1.08%
1-5 years, weighted average yield	1.63%
Weighted Average Yield	1.38%
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Within 1 year, amortized cost	$ 4,500
1-5 years, amortized cost	21,704
5-10 years, amortized cost	10,450
Amortized Cost	36,654	44,437
Within 1 year, fair value	4,504
1-5 years, fair value	21,952
5-10 years, fair value	10,676
Fair Value	$ 37,132
Within 1 year, weighted average yield	2.10%
1-5 years, weighted average yield	2.14%
5-10 years, weighted average yield	2.58%
Weighted Average Yield	2.26%
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
5-10 years, amortized cost	$ 3,000
Over 10 years, amortized cost	3,000
Amortized Cost	6,000
5-10 years, fair value	3,000
Over 10 years, fair value	3,005
Fair Value	$ 6,005
5-10 years, weighted average yield	3.03%
Over 10 years, weighted average yield	3.09%
Weighted Average Yield	3.06%
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Over 10 years, amortized cost	$ 5,422
Amortized Cost	5,422	$ 4,922
Over 10 years, fair value	5,731
Fair Value	$ 5,731
Over 10 years, weighted average yield	6.37%
Weighted Average Yield	6.37%

Investment Securities - Sche66

Investment Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity of Debt Securities (Details) - Municipal securities $ in Thousands	Dec. 31, 2017USD ($)
Schedule Of Debt Securities [Line Items]
Within 1 year, amortized cost	$ 3,730
1-5 years, amortized cost	10,665
Amortized Cost	14,395
Within 1 year, fair value	3,728
1-5 years, fair value	10,693
Fair Value	$ 14,421
Within 1 year, weighted average yield	1.64%
1-5 years, weighted average yield	2.66%
Weighted Average Yield	2.40%

Investment Securities - Sche67

Investment Securities - Schedule Of Available-For-Sale Securities Proceeds, Gains, And Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Marketable Securities [Abstract]
Proceeds	$ 25,006	$ 5,785	$ 20,522
Gross Gains	14	12	271
Gross Losses	$ 3	$ 23	$ 0

Investment Securities - Summ68

Investment Securities - Summary of Interest Income On Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Total taxable interest income	$ 4,208	$ 3,613	$ 3,073
Total tax-exempt interest income	367	282	320
Total	4,575	3,895	3,393
U.S. Treasury and government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Total taxable interest income	2,983	2,661	2,378
U.S. Agency Mortgage-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Total taxable interest income	0	4	25
Other
Schedule of Available-for-sale Securities [Line Items]
Total taxable interest income	1,225	948	670
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Total tax-exempt interest income	$ 367	$ 282	$ 320

Loans and Credit Quality - Nar

Loans and Credit Quality - Narrative (Details)	Apr. 01, 2014USD ($)purchased_loan	Dec. 31, 2017USD ($)financing_commitmentcontract	Dec. 31, 2016USD ($)contract	Dec. 31, 2015USD ($)contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans secured by real estate		71.00%
Loans unsecured		3.00%
Loans secured for general commercial uses		26.00%
Net nonaccrual loans		$ 21,159,000	$ 12,480,000
Interest income earned on nonaccrual loans		1,400,000	676,000	$ 276,000
Interest income earned on nonaccrual loans with no balance		120,000	181,000	617,000
Greater than 90 days still accruing		252,000	456,000
Recorded investment in loans considered to be impaired		31,967,000	38,656,000
Impaired loan, average recorded investment		36,895,000	42,599,000	26,000,000
Impaired loan, interest income on accrual method		983,000	2,354,000	$ 1,100,000
Loans classified as troubled debt restructuring		$ 23,847,000	16,200,000
Commitment to Lend | financing_commitment		0
Write down on TDR		$ 731,000	$ 0
TDR with specific impairment | contract		2	4
TDR that subsequently defaulted, recorded investment | contract		0	0	0
Loans pledged as collateral		$ 0	$ 0
Unfunded loan commitments		15,000	15,000
Alaska Pacific Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased impaired loans | purchased_loan	18
Accretable difference on purchased loans	$ 0
Fair value of purchased credit impaired loans	$ 3,900,000	$ 923,000	$ 1,100,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recovery time for market		18 months
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recovery time for market		24 months

Loans and Credit Quality - Loa

Loans and Credit Quality - Loan Portfolio Segmented By Risk Class (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Subtotal	$ 959,823	$ 979,449
Less: Unearned origination fees, net of origination costs	(4,156)	(4,434)
Total loans	955,667	975,015
Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Subtotal	905,736	939,573
Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Subtotal	18,726	2,586
Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Subtotal	35,361	37,290
Commercial
Financing Receivable, Recorded Investment [Line Items]
Subtotal	313,769	278,178
Commercial | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Subtotal	277,626	257,639
Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Subtotal	4,921	1,950
Commercial | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Subtotal	31,222	18,589
Real estate construction one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Subtotal	31,201	26,061
Real estate construction one-to-four family | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Subtotal	31,201	26,061
Real estate construction one-to-four family | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Subtotal	0	0
Real estate construction one-to-four family | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Subtotal	0	0
Real estate construction other
Financing Receivable, Recorded Investment [Line Items]
Subtotal	80,093	72,159
Real estate construction other | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Subtotal	80,093	72,159
Real estate construction other | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Subtotal	0	0
Real estate construction other | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Subtotal	0	0
Real estate term owner occupied
Financing Receivable, Recorded Investment [Line Items]
Subtotal	132,098	152,178
Real estate term owner occupied | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Subtotal	127,115	135,359
Real estate term owner occupied | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Subtotal	2,095	57
Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Subtotal	2,888	16,762
Real estate term non-owner occupied
Financing Receivable, Recorded Investment [Line Items]
Subtotal	319,459	356,601
Real estate term non-owner occupied | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Subtotal	307,926	355,903
Real estate term non-owner occupied | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Subtotal	11,051	0
Real estate term non-owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Subtotal	482	698
Real estate term other
Financing Receivable, Recorded Investment [Line Items]
Subtotal	40,411	45,402
Real estate term other | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Subtotal	39,777	44,733
Real estate term other | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Subtotal	634	0
Real estate term other | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Subtotal	0	669
Consumer secured by 1st deeds of trust
Financing Receivable, Recorded Investment [Line Items]
Subtotal	22,873	23,589
Consumer secured by 1st deeds of trust | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Subtotal	22,103	22,568
Consumer secured by 1st deeds of trust | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Subtotal	3	501
Consumer secured by 1st deeds of trust | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Subtotal	767	520
Consumer other
Financing Receivable, Recorded Investment [Line Items]
Subtotal	19,919	25,281
Consumer other | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Subtotal	19,895	25,151
Consumer other | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Subtotal	22	78
Consumer other | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Subtotal	$ 2	$ 52

Loans and Credit Quality - Non

Loans and Credit Quality - Nonaccrual Loans By Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	$ 21,626	$ 13,893
Government guarantees on nonaccrual loans	(467)	(1,413)
Net nonaccrual loans	21,159	12,480
Commercial
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	19,917	13,500
Real estate term owner occupied
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	1,331	29
Real estate term non-owner occupied
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	0	197
Consumer secured by 1st deeds of trust
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	378	167
30-59 Days Past Due
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	810	8,750
Government guarantees on nonaccrual loans	0	0
Net nonaccrual loans	810	8,750
30-59 Days Past Due | Commercial
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	810	8,750
30-59 Days Past Due | Real estate term owner occupied
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	0	0
30-59 Days Past Due | Real estate term non-owner occupied
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans		0
30-59 Days Past Due | Consumer secured by 1st deeds of trust
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	0	0
60-89 Days Past Due
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	0	0
Government guarantees on nonaccrual loans	0	0
Net nonaccrual loans	0	0
60-89 Days Past Due | Commercial
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	0	0
60-89 Days Past Due | Real estate term owner occupied
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	0	0
60-89 Days Past Due | Real estate term non-owner occupied
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans		0
60-89 Days Past Due | Consumer secured by 1st deeds of trust
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	0	0
Greater Than 90 Days Past Due
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	3,030	4,375
Government guarantees on nonaccrual loans	(94)	(1,413)
Net nonaccrual loans	2,936	2,962
Greater Than 90 Days Past Due | Commercial
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	2,652	4,208
Greater Than 90 Days Past Due | Real estate term owner occupied
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	0	0
Greater Than 90 Days Past Due | Real estate term non-owner occupied
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans		0
Greater Than 90 Days Past Due | Consumer secured by 1st deeds of trust
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	378	167
Current
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	17,786	768
Government guarantees on nonaccrual loans	(373)	0
Net nonaccrual loans	17,413	768
Current | Commercial
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	16,455	542
Current | Real estate term owner occupied
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	1,331	29
Current | Real estate term non-owner occupied
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans		197
Current | Consumer secured by 1st deeds of trust
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	$ 0	$ 0

Loans and Credit Quality - Pas

Loans and Credit Quality - Past Due Loans And Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	$ 2,388	$ 2,643
Nonaccrual loans	21,626	13,893
Current loans	935,809	962,913
Total financing receivables	959,823	979,449
Less: Unearned origination fees, net of origination costs	(4,156)	(4,434)
Total loans	955,667	975,015
30-59 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	2,083	1,448
Nonaccrual loans	810	8,750
60-89 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	53	739
Nonaccrual loans	0	0
Greater Than 90 Days Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	252	456
Nonaccrual loans	3,030	4,375
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	743	545
Nonaccrual loans	19,917	13,500
Current loans	293,109	264,133
Total financing receivables	313,769	278,178
Commercial | 30-59 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	503	0
Nonaccrual loans	810	8,750
Commercial | 60-89 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	141
Nonaccrual loans	0	0
Commercial | Greater Than 90 Days Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	240	404
Nonaccrual loans	2,652	4,208
Real estate construction one-to-four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Nonaccrual loans	0	0
Current loans	31,201	26,061
Total financing receivables	31,201	26,061
Real estate construction one-to-four family | 30-59 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Real estate construction one-to-four family | 60-89 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Real estate construction one-to-four family | Greater Than 90 Days Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Real estate construction other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	90	0
Nonaccrual loans	0	0
Current loans	80,003	72,159
Total financing receivables	80,093	72,159
Real estate construction other | 30-59 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	90	0
Real estate construction other | 60-89 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Real estate construction other | Greater Than 90 Days Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Real estate term owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	966	887
Nonaccrual loans	1,331	29
Current loans	129,801	151,262
Total financing receivables	132,098	152,178
Real estate term owner occupied | 30-59 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	966	887
Nonaccrual loans	0	0
Real estate term owner occupied | 60-89 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Nonaccrual loans	0	0
Real estate term owner occupied | Greater Than 90 Days Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Nonaccrual loans	0	0
Real estate term non-owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Nonaccrual loans	0	197
Current loans	319,459	356,404
Total financing receivables	319,459	356,601
Real estate term non-owner occupied | 30-59 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Nonaccrual loans		0
Real estate term non-owner occupied | 60-89 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Nonaccrual loans		0
Real estate term non-owner occupied | Greater Than 90 Days Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Nonaccrual loans		0
Real estate term other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Nonaccrual loans	0	0
Current loans	40,411	45,402
Total financing receivables	40,411	45,402
Real estate term other | 30-59 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Real estate term other | 60-89 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Real estate term other | Greater Than 90 Days Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Consumer secured by 1st deeds of trust
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	363	908
Nonaccrual loans	378	167
Current loans	22,132	22,514
Total financing receivables	22,873	23,589
Consumer secured by 1st deeds of trust | 30-59 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	363	390
Nonaccrual loans	0	0
Consumer secured by 1st deeds of trust | 60-89 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	518
Nonaccrual loans	0	0
Consumer secured by 1st deeds of trust | Greater Than 90 Days Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Nonaccrual loans	378	167
Consumer other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	226	303
Nonaccrual loans	0	0
Current loans	19,693	24,978
Total financing receivables	19,919	25,281
Consumer other | 30-59 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	161	171
Consumer other | 60-89 Days Past Due Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	53	80
Consumer other | Greater Than 90 Days Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans	$ 12	$ 52

Loans and Credit Quality - Imp

Loans and Credit Quality - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment	$ 23,979	$ 29,435
Impaired loan, no related allowance, unpaid principal balance	25,135	30,131
Impaired loan, related allowance, recorded investment	7,988	9,221
Impaired loan, related allowance, unpaid principal balance	7,988	9,221
Related allowance	966	614
Recorded investment	31,967	38,656
Unpaid principal balance	33,123	39,352
Impaired loan, no related allowance, average recorded investment	28,351	38,089
Impaired loan, no related allowance, interest income on accrual method	976	2,354
Impaired loan, related allowance, average recorded investment	8,544	4,510
Impaired loan, related allowance, interest income on accrual method	7	0
Impaired loan, average recorded investment	36,895	42,599	$ 26,000
Impaired loan, interest income on accrual method	983	2,354	$ 1,100
Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment	2,153	223
Impaired loan, no related allowance, unpaid principal balance	2,153	223
Related allowance	0	0
Recorded investment	2,153	223
Unpaid principal balance	2,153	223
Impaired loan, no related allowance, average recorded investment	582	170
Impaired loan, no related allowance, interest income on accrual method	1	13
Impaired loan, related allowance, average recorded investment	525	0
Impaired loan, related allowance, interest income on accrual method	3	0
Impaired loan, average recorded investment	1,107	170
Impaired loan, interest income on accrual method	4	13
Commercial | Asset Quality Rating - Substandard
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment	16,671	9,213
Impaired loan, no related allowance, unpaid principal balance	17,742	9,893
Impaired loan, related allowance, recorded investment	7,988	9,221
Impaired loan, related allowance, unpaid principal balance	7,988	9,221
Related allowance	966	614
Recorded investment	24,659	18,434
Unpaid principal balance	25,730	19,114
Impaired loan, no related allowance, average recorded investment	19,521	15,522
Impaired loan, no related allowance, interest income on accrual method	487	840
Impaired loan, related allowance, average recorded investment	8,019	2,451
Impaired loan, related allowance, interest income on accrual method	4	0
Impaired loan, average recorded investment	27,540	17,973
Impaired loan, interest income on accrual method	491	840
Real estate construction one-to-four family | Asset Quality Rating - Substandard
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, average recorded investment	0	988
Impaired loan, no related allowance, interest income on accrual method	0	0
Impaired loan, related allowance, average recorded investment	0	1,986
Impaired loan, related allowance, interest income on accrual method	0	0
Impaired loan, average recorded investment	0	2,974
Impaired loan, interest income on accrual method	0	0
Real estate construction other | Asset Quality Rating - Substandard
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, average recorded investment	0	1,431
Impaired loan, no related allowance, interest income on accrual method	0	0
Impaired loan, average recorded investment	0	1,431
Impaired loan, interest income on accrual method	0	0
Real estate term owner occupied | Asset Quality Rating - Pass
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment		252
Impaired loan, no related allowance, unpaid principal balance		252
Related allowance		0
Recorded investment		252
Unpaid principal balance		252
Impaired loan, no related allowance, average recorded investment	62	378
Impaired loan, no related allowance, interest income on accrual method	5	34
Impaired loan, average recorded investment	62	378
Impaired loan, interest income on accrual method	5	34
Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment	2,862	16,694
Impaired loan, no related allowance, unpaid principal balance	2,862	16,694
Related allowance	0	0
Recorded investment	2,862	16,694
Unpaid principal balance	2,862	16,694
Impaired loan, no related allowance, average recorded investment	5,402	16,551
Impaired loan, no related allowance, interest income on accrual method	286	1,202
Impaired loan, average recorded investment	5,402	16,551
Impaired loan, interest income on accrual method	286	1,202
Real estate term non-owner occupied | Asset Quality Rating - Pass
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment	303	391
Impaired loan, no related allowance, unpaid principal balance	303	391
Related allowance	0	0
Recorded investment	303	391
Unpaid principal balance	303	391
Impaired loan, no related allowance, average recorded investment	354	442
Impaired loan, no related allowance, interest income on accrual method	43	91
Impaired loan, average recorded investment	354	442
Impaired loan, interest income on accrual method	43	91
Real estate term non-owner occupied | Asset Quality Rating - Special Mention
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment	89
Impaired loan, no related allowance, unpaid principal balance	89
Related allowance	0
Recorded investment	89
Unpaid principal balance	89
Impaired loan, no related allowance, average recorded investment	23	0
Impaired loan, no related allowance, interest income on accrual method	2	0
Impaired loan, average recorded investment	23	0
Impaired loan, interest income on accrual method	2	0
Real estate term non-owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment	482	693
Impaired loan, no related allowance, unpaid principal balance	482	693
Related allowance	0	0
Recorded investment	482	693
Unpaid principal balance	482	693
Impaired loan, no related allowance, average recorded investment	611	599
Impaired loan, no related allowance, interest income on accrual method	45	28
Impaired loan, average recorded investment	611	599
Impaired loan, interest income on accrual method	45	28
Real estate term other | Asset Quality Rating - Pass
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment	559	633
Impaired loan, no related allowance, unpaid principal balance	559	633
Related allowance	0	0
Recorded investment	559	633
Unpaid principal balance	559	633
Impaired loan, no related allowance, average recorded investment	595	627
Impaired loan, no related allowance, interest income on accrual method	42	58
Impaired loan, average recorded investment	595	627
Impaired loan, interest income on accrual method	42	58
Real estate term other | Asset Quality Rating - Special Mention
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, average recorded investment	0	43
Impaired loan, no related allowance, interest income on accrual method	0	4
Impaired loan, average recorded investment	0	43
Impaired loan, interest income on accrual method	0	4
Real estate term other | Asset Quality Rating - Substandard
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment		669
Impaired loan, no related allowance, unpaid principal balance		669
Related allowance		0
Recorded investment		669
Unpaid principal balance		669
Impaired loan, no related allowance, average recorded investment	487	683
Impaired loan, no related allowance, interest income on accrual method	34	55
Impaired loan, average recorded investment	487	683
Impaired loan, interest income on accrual method	34	55
Consumer secured by 1st deeds of trust | Asset Quality Rating - Pass
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment	136
Impaired loan, no related allowance, unpaid principal balance	136
Related allowance	0
Recorded investment	136
Unpaid principal balance	136
Impaired loan, no related allowance, average recorded investment	35	38
Impaired loan, no related allowance, interest income on accrual method	3	2
Impaired loan, average recorded investment	35	38
Impaired loan, interest income on accrual method	3	2
Consumer secured by 1st deeds of trust | Asset Quality Rating - Special Mention
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment		143
Impaired loan, no related allowance, unpaid principal balance		143
Related allowance		0
Recorded investment		143
Unpaid principal balance		143
Impaired loan, no related allowance, average recorded investment	105	36
Impaired loan, no related allowance, interest income on accrual method	10	3
Impaired loan, average recorded investment	105	36
Impaired loan, interest income on accrual method	10	3
Consumer secured by 1st deeds of trust | Asset Quality Rating - Substandard
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment	724	472
Impaired loan, no related allowance, unpaid principal balance	809	488
Related allowance	0	0
Recorded investment	724	472
Unpaid principal balance	809	488
Impaired loan, no related allowance, average recorded investment	561	568
Impaired loan, no related allowance, interest income on accrual method	17	24
Impaired loan, related allowance, average recorded investment	0	73
Impaired loan, related allowance, interest income on accrual method	0	0
Impaired loan, average recorded investment	561	641
Impaired loan, interest income on accrual method	17	24
Consumer other | Asset Quality Rating - Substandard
Financing Receivable, Impaired [Line Items]
Impaired loan, no related allowance, recorded investment		52
Impaired loan, no related allowance, unpaid principal balance		52
Related allowance		0
Recorded investment		52
Unpaid principal balance		52
Impaired loan, no related allowance, average recorded investment	13	13
Impaired loan, no related allowance, interest income on accrual method	1	0
Impaired loan, average recorded investment	13	13
Impaired loan, interest income on accrual method	$ 1	$ 0

Loans and Credit Quality - Tro

Loans and Credit Quality - Troubled Debt Restructured Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	$ 10,610
Existing Troubled Debt Restructurings	13,237
Total	23,847	$ 16,200
Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	2,059
Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	8,551
Accrual Status
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	2,261
Existing Troubled Debt Restructurings	5,407
Total	7,668
Accrual Status | Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	2,059
Accrual Status | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	202
Nonaccrual Status
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	8,349
Existing Troubled Debt Restructurings	7,830
Total	16,179
Nonaccrual Status | Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	0
Nonaccrual Status | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
New Troubled Debt Restructurings	$ 8,349

Loans and Credit Quality - New

Loans and Credit Quality - Newly Restructured Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)contract
Financing Receivable, Modifications [Line Items]
Pre-modification, number of contracts | contract	3
Pre-modification, total modification	$ 12,953
Post-modification, number of contracts | contract	3
Post-modification, total modification	$ 10,610
Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Modifications [Line Items]
Pre-modification, number of contracts | contract	1
Pre-modification, total modification	$ 2,078
Post-modification, number of contracts | contract	1
Post-modification, total modification	$ 2,059
Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, number of contracts | contract	2
Pre-modification, total modification	$ 10,875
Post-modification, number of contracts | contract	2
Post-modification, total modification	$ 8,551
Rate Modification
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Rate Modification | Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Rate Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Term Modification
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	12,743
Post-modification, total modification	10,408
Term Modification | Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	2,078
Post-modification, total modification	2,059
Term Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	10,665
Post-modification, total modification	8,349
Payment Modification
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	210
Post-modification, total modification	202
Payment Modification | Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Payment Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	210
Post-modification, total modification	202
Combination Modification
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Combination Modification | Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Combination Modification | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	$ 0

Loans and Credit Quality - Ana

Loans and Credit Quality - Analysis Of Loan Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance, beginning of the year	$ 90	$ 117
Loans made	0	0
Repayments	90	27
Balance, end of year	$ 0	$ 90

Allowance For Loan Losses - Al

Allowance For Loan Losses - Allowance For Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 19,697	$ 18,153	$ 16,723
Charge-Offs	(1,744)	(1,482)	(826)
Recoveries	308	728	502
Provision (benefit)	3,200	2,298	1,754
Balance, end of period	21,461	19,697	18,153
Individually evaluated for impairment	966	614	344
Collectively evaluated for impairment	20,495	19,083	17,809
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	5,535	5,906	5,643
Charge-Offs	(1,611)	(903)	(616)
Recoveries	293	699	379
Provision (benefit)	1,955	(167)	500
Balance, end of period	6,172	5,535	5,906
Individually evaluated for impairment	966	614	344
Collectively evaluated for impairment	5,206	4,921	5,562
Real estate construction one-to-four family
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	550	854	644
Charge-Offs	0	(535)	0
Recoveries	0	0	0
Provision (benefit)	79	231	210
Balance, end of period	629	550	854
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	629	550	854
Real estate construction other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	1,465	1,439	1,653
Charge-Offs	0	0	0
Recoveries	0	0	0
Provision (benefit)	101	26	(214)
Balance, end of period	1,566	1,465	1,439
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	1,566	1,465	1,439
Real estate term owner occupied
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	2,358	1,657	1,580
Charge-Offs	0	0	0
Recoveries	0	0	0
Provision (benefit)	(164)	701	77
Balance, end of period	2,194	2,358	1,657
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	2,194	2,358	1,657
Real estate term non-owner occupied
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	6,853	5,515	4,704
Charge-Offs	0	0	0
Recoveries	0	0	0
Provision (benefit)	(810)	1,338	811
Balance, end of period	6,043	6,853	5,515
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	6,043	6,853	5,515
Real estate term other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	819	628	656
Charge-Offs	(5)	0	(81)
Recoveries	2	0	107
Provision (benefit)	(91)	191	(54)
Balance, end of period	725	819	628
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	725	819	628
Consumer secured by 1st deeds of trust
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	313	264	285
Charge-Offs	(85)	(36)	(28)
Recoveries	2	0	3
Provision (benefit)	85	85	4
Balance, end of period	315	313	264
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	315	313	264
Consumer other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	408	397	410
Charge-Offs	(43)	(8)	(101)
Recoveries	11	29	13
Provision (benefit)	(69)	(10)	75
Balance, end of period	307	408	397
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	307	408	397
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	1,396	1,493	1,148
Charge-Offs	0	0	0
Recoveries	0	0	0
Provision (benefit)	2,114	(97)	345
Balance, end of period	3,510	1,396	1,493
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	$ 3,510	$ 1,396	$ 1,493

Allowance For Loan Losses - Re

Allowance For Loan Losses - Recorded Investment Segregated By Amounts Individually Or Collectively In Allowance For Loan Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Total financing receivables	$ 959,823	$ 979,449
Individually evaluated for impairment	31,967	38,656
Collectively evaluated for impairment	927,856	940,793
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total financing receivables	313,769	278,178
Individually evaluated for impairment	26,812	18,657
Collectively evaluated for impairment	286,957	259,521
Real estate construction one-to-four family
Financing Receivable, Allowance for Credit Losses [Line Items]
Total financing receivables	31,201	26,061
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	31,201	26,061
Real estate construction other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total financing receivables	80,093	72,159
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	80,093	72,159
Real estate term owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Total financing receivables	132,098	152,178
Individually evaluated for impairment	2,862	16,946
Collectively evaluated for impairment	129,236	135,232
Real estate term non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Total financing receivables	319,459	356,601
Individually evaluated for impairment	874	1,084
Collectively evaluated for impairment	318,585	355,517
Real estate term other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total financing receivables	40,411	45,402
Individually evaluated for impairment	559	1,302
Collectively evaluated for impairment	39,852	44,100
Consumer secured by 1st deeds of trust
Financing Receivable, Allowance for Credit Losses [Line Items]
Total financing receivables	22,873	23,589
Individually evaluated for impairment	860	615
Collectively evaluated for impairment	22,013	22,974
Consumer other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total financing receivables	19,919	25,281
Individually evaluated for impairment	0	52
Collectively evaluated for impairment	$ 19,919	$ 25,229

Allowance For Loan Losses - Ba

Allowance For Loan Losses - Balance Of The Allowance Segregated By Segment And Class (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 966	$ 614	$ 344
Collectively evaluated for impairment	20,495	19,083	17,809
Total	21,461	19,697	18,153	$ 16,723
Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	966	614
Collectively evaluated for impairment	8	3
Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	16,453	17,628
Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	524	56
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	3,510	1,396
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	966	614	344
Collectively evaluated for impairment	5,206	4,921	5,562
Total	6,172	5,535	5,906	5,643
Commercial | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	966	614
Collectively evaluated for impairment	7	3
Commercial | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	5,079	4,867
Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	120	51
Commercial | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate construction one-to-four family
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	629	550	854
Total	629	550	854	644
Real estate construction one-to-four family | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Real estate construction one-to-four family | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	629	550
Real estate construction one-to-four family | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate construction one-to-four family | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate construction other
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	1,566	1,465	1,439
Total	1,566	1,465	1,439	1,653
Real estate construction other | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Real estate construction other | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	1,566	1,465
Real estate construction other | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate construction other | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate term owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	2,194	2,358	1,657
Total	2,194	2,358	1,657	1,580
Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Real estate term owner occupied | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	2,154	2,358
Real estate term owner occupied | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	40	0
Real estate term owner occupied | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate term non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	6,043	6,853	5,515
Total	6,043	6,853	5,515	4,704
Real estate term non-owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Real estate term non-owner occupied | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	5,680	6,853
Real estate term non-owner occupied | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	363	0
Real estate term non-owner occupied | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate term other
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	725	819	628
Total	725	819	628	656
Real estate term other | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Real estate term other | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	725	819
Real estate term other | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate term other | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Consumer secured by 1st deeds of trust
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	315	313	264
Total	315	313	264	285
Consumer secured by 1st deeds of trust | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Consumer secured by 1st deeds of trust | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	315	310
Consumer secured by 1st deeds of trust | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	3
Consumer secured by 1st deeds of trust | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Consumer other
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	307	408	397
Total	307	408	397	410
Consumer other | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1	0
Consumer other | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	305	406
Consumer other | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	1	2
Consumer other | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	3,510	1,396	1,493
Total	3,510	1,396	$ 1,493	$ 1,148
Unallocated | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Unallocated | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Unallocated | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Unallocated | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	$ 3,510	$ 1,396

Purchased Receivables - Narrati

Purchased Receivables - Narrative (Details)	12 Months Ended
	Dec. 31, 2017USD ($)segmentpurchased_receivable	Dec. 31, 2016USD ($)purchased_receivable	Dec. 31, 2015USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity of purchased receivables (less than)	1 year
Number of segments and classes of purchased receivables | segment	1
Restructured purchased receivables	$ 23,847,000	$ 16,200,000
Charge-offs	$ 1,744,000	$ 1,482,000	$ 826,000
Purchased Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased receivables past due | purchased_receivable	0	0
Restructured purchased receivables	$ 0	$ 0	0
Charge-offs	$ 0	$ 0	$ 0

Purchased Receivables - Summary

Purchased Receivables - Summary Of Components Of Net Purchased Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Purchased Receivables [Abstract]
Purchased receivables	$ 22,431	$ 20,662
Reserve for purchased receivable losses	(200)	(171)	$ (181)	$ (289)
Total	$ 22,231	$ 20,491

Purchased Receivables - Summa82

Purchased Receivables - Summary of Allowance for Loan Losses Purchased Receivables (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	$ 171,000	$ 181,000	$ 289,000
Charge-offs	(1,744,000)	(1,482,000)	(826,000)
Balance at end of year	200,000	171,000	181,000
Purchased Receivable
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0	0
Recoveries	0	0	30,000
Net recoveries (charge-offs)	0	0	30,000
Reserve for (recovery from) purchased receivables	$ 29,000	$ (10,000)	$ (138,000)

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Real Estate Owned Expense [Line Items]
OREO	$ 8,651	$ 6,574
OREO expense, net of rental income and gains on sale	837	98	$ 190
OREO operating expense
Other Real Estate Owned Expense [Line Items]
OREO expense, net of rental income and gains on sale	420	304	224
Impairment on OREO
Other Real Estate Owned Expense [Line Items]
OREO expense, net of rental income and gains on sale	904	187	361
Rental income on OREO
Other Real Estate Owned Expense [Line Items]
OREO expense, net of rental income and gains on sale	(116)	(98)	(80)
Gains on sale of OREO
Other Real Estate Owned Expense [Line Items]
OREO expense, net of rental income and gains on sale	$ (371)	$ (295)	$ (315)

Premises and Equipment - Schedu

Premises and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total premise and equipment	$ 57,322	$ 63,516
Accumulated depreciation and amortization	(19,455)	(24,198)
Total premise and equipment, net	37,867	39,318
Land
Property, Plant and Equipment [Line Items]
Total premise and equipment	2,562	2,596
Furniture And Equipment
Property, Plant and Equipment [Line Items]
Total premise and equipment	8,323	14,912
Tenant Improvements
Property, Plant and Equipment [Line Items]
Total premise and equipment	$ 8,323	8,325
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, useful life	39 years
Total premise and equipment	$ 38,114	$ 37,683
Minimum | Furniture And Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, useful life	3 years
Minimum | Tenant Improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, useful life	2 years
Maximum | Furniture And Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, useful life	7 years
Maximum | Tenant Improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, useful life	15 years

Premises and Equipment - Narrat

Premises and Equipment - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Depreciation expense and amortization of leasehold improvements	$ 2,867,000	$ 2,439,000	$ 2,264,000
Related party transaction	$ 0	$ 0

Mortgage Servicing Rights - Mor

Mortgage Servicing Rights - Mortgage Servicing Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 4,157
Additions to mortgage servicing rights carried at fair value	3,146	$ 3,029	$ 802
Changes in fair value:
Carrying value, December 31	7,305	4,157
Balance of mortgage loans serviced for others	$ 406,291	$ 272,442
MSR as a percentage of serviced loans	1.80%	1.53%
Mortgage servicing rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 4,157	$ 1,654
Additions to mortgage servicing rights carried at fair value	3,146	3,029
Changes in fair value:
Due to changes in model inputs of assumptions	551	(214)
Other	(549)	(312)
Carrying value, December 31	$ 7,305	$ 4,157	$ 1,654

Mortgage Servicing Rights - Nar

Mortgage Servicing Rights - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Noninterest Income
Servicing Assets at Fair Value [Line Items]
Mortgage servicing fees	$ 1,300	$ 675	$ 261

Mortgage Servicing Rights - Val

Mortgage Servicing Rights - Valuation Assumptions (Details) - Mortgage servicing rights	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]
Constant prepayment rate	9.00%	11.58%
Discount rate	9.45%	9.25%

Goodwill and Intangible Asset89

Goodwill and Intangible Assets - Intangible Assets And Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 15,017	$ 15,017
Core deposit intangible	257	357
Trade name intangible	950	950
Intangible assets total	$ 16,224	$ 16,324

Goodwill and Intangible Asset90

Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2007	Apr. 01, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill recorded	$ 15,017	$ 15,017
Accumulated amortization for intangible assets	6,900	6,800
Trade name intangible	950	950
Intangible asset amortization expense	100	135	$ 258
Alaska First
Finite-Lived Intangible Assets [Line Items]
Goodwill recorded				$ 1,800
CDI recorded				$ 1,300
Alaska Pacific Bank
Finite-Lived Intangible Assets [Line Items]
CDI recorded					$ 623
RML
Finite-Lived Intangible Assets [Line Items]
Goodwill recorded	7,500	7,500
Trade name intangible	950	950
Core Deposits | Alaska Pacific Bank
Finite-Lived Intangible Assets [Line Items]
Estimated useful life, years				10 years
Accumulated amortization for intangible assets	$ 365	$ 283	$ 190

Goodwill and Intangible Asset91

Goodwill and Intangible Assets - Future Amortization Expense (Details) $ in Thousands	Dec. 31, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,018	$ 71
2,019	59
2,020	48
2,021	37
2,022	25
Thereafter	17
Total	$ 257

Other Assets - Schedule of Othe

Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Investment in Low Income Housing Partnerships	$ 21,908	$ 24,174
Deferred taxes, net	6,260	10,264	$ 9,939
Taxes receivable	5,331	1,755
Bank owned life insurance	5,313	6,181
Software	5,270	219
Accrued interest receivable	4,385	3,734
Investment in equity method investments	3,878	4,560
Prepaid expenses	1,269	1,596
Rate lock derivative	873	1,137
Other assets	1,654	2,508
Total	$ 56,141	$ 56,128

Other Assets - Narrative (Detai

Other Assets - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Commitments to invest, amortization expense	$ 2,300	$ 2,900	$ 2,700
Remaining commitment to invest in low income housing partnership	$ 5,496
Pacific Wealth Advisors Llc
Schedule of Equity Method Investments [Line Items]
Equity interest percentage	24.00%
HomeState Mortgage LLC
Schedule of Equity Method Investments [Line Items]
Equity interest percentage	30.00%

Other Assets - Schedule of Inve

Other Assets - Schedule of Investing Commitment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Other Commitments [Line Items]
Original commitment amount	$ 37,566
Less: life to date contributions	(32,070)
Remaining commitment amount	$ 5,496
R4 - MVV
Other Commitments [Line Items]
Years over which tax credits are earned	17 years
Original commitment amount	$ 8,528
Less: life to date contributions	(8,248)
Remaining commitment amount	$ 280
R4 - Coronado
Other Commitments [Line Items]
Years over which tax credits are earned	17 years
Original commitment amount	$ 10,729
Less: life to date contributions	(10,138)
Remaining commitment amount	$ 591
R4 - PJ33
Other Commitments [Line Items]
Years over which tax credits are earned	17 years
Original commitment amount	$ 6,809
Less: life to date contributions	(2,184)
Remaining commitment amount	$ 4,625
WNC
Other Commitments [Line Items]
Years over which tax credits are earned	16 years
Original commitment amount	$ 2,500
Less: life to date contributions	(2,500)
Remaining commitment amount	$ 0
USA 57
Other Commitments [Line Items]
Years over which tax credits are earned	15 years
Original commitment amount	$ 3,000
Less: life to date contributions	(3,000)
Remaining commitment amount	$ 0
Centerline XXXIII
Other Commitments [Line Items]
Years over which tax credits are earned	18 years
Original commitment amount	$ 3,000
Less: life to date contributions	(3,000)
Remaining commitment amount	$ 0
Centerline XXII
Other Commitments [Line Items]
Years over which tax credits are earned	18 years
Original commitment amount	$ 3,000
Less: life to date contributions	(3,000)
Remaining commitment amount	$ 0

Deposits - Scheduled Maturities

Deposits - Scheduled Maturities Of Certificates Of Deposit (Details) $ in Thousands	Dec. 31, 2017USD ($)
Deposits [Abstract]
2,018	$ 66,013
2,019	19,462
2,020	12,008
2,021	353
2,022	806
Thereafter	1,885
Total	$ 100,527

Deposits - Narrative (Details)

Deposits - Narrative (Details) bank in Thousands	Dec. 31, 2017USD ($)bank	Dec. 31, 2016USD ($)
Deposits [Line Items]
Certificates of deposit	$ 100,527,000
CD collateralized by FHLB letters of credit	0	$ 0
Securities pledged to collateralize certificates of deposit	0	0
Deposits held for related parties	$ 2,500,000	2,500,000
CDARS
Deposits [Line Items]
Number of banks in, more than | bank	3
Percentage of coverage of certificates of deposit in CDARS	100.00%
Certificates of deposit	$ 0	$ 0

Deposits - Interest Expense on

Deposits - Interest Expense on Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
Interest-bearing demand accounts	$ 21	$ 67	$ 63
Money market accounts	472	418	404
Savings accounts	520	489	470
Certificates of deposit $100,000 and greater	358	707	754
Certificates of deposit less than $100,000	336	189	248
Total deposits	$ 1,707	$ 1,870	$ 1,939

Borrowings - Narrative (Detail

Borrowings - Narrative (Details) - USD ($)	Mar. 22, 2013	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Ratio of line of credit to eligible assets		35.00%								35.00%
Line of credit		$ 147,700,000								$ 147,700,000
Ratio of line of credit to total assets		10.00%								10.00%
Ratio of eligible assets to borrowing capacity		35.00%								35.00%
Additional borrowing capacity		$ 531,700,000								$ 531,700,000
Long-term FHLB advances		7,400,000				$ 4,300,000				7,400,000	$ 4,300,000
Term of FHLB advances	18 years		20 years					20 years
Repayment term of FHLB advance	30 years		30 years					30 years
Fixed rate of FHLB advance	3.12%		3.25%					2.61%
Loans pledged as collateral		0				0				0	0
FHLB discount window advances outstanding		0				0				0	0
Interest paid (less than)										$ 2,470,000	2,553,000	$ 2,833,000
Alaska limit on borrowing, percent of total assets										15.00%
Alaska limit on borrowing, total assets		225,800,000				227,400,000				$ 225,800,000	227,400,000
Securities sold under agreements to repurchase		$ 27,746,000				$ 27,607,000				$ 27,746,000	$ 27,607,000
Percentage paid on securities sold under agreements to repurchase		0.14%				0.11%				0.14%	0.11%
Average balance outstanding		$ 29,000,000				$ 27,200,000				$ 29,000,000	$ 27,200,000
Maximum amount outstanding at any month end										32,600,000	30,500,000
Interest expense on deposits, borrowings and junior subordinated debentures		$ 548,000	$ 602,000	$ 648,000	$ 632,000	$ 631,000	$ 647,000	$ 639,000	$ 644,000	$ 2,430,000	$ 2,561,000	$ 2,871,000
Weighted average interest rate		3.23%				2.82%				3.23%	2.82%	2.52%
FHLB Community Investment Program Advance
Debt Instrument [Line Items]
Face amount	$ 2,200,000
FHLB Community Investment Cash Advance Program
Debt Instrument [Line Items]
Face amount			$ 3,100,000					$ 2,300,000
Note Agreement With Federal Reserve Bank
Debt Instrument [Line Items]
Loans pledged as collateral		$ 73,600,000								$ 73,600,000
Interest paid (less than)										1,000	$ 1,000
Discount Window
Debt Instrument [Line Items]
Loans pledged as collateral		$ 43,900,000								43,900,000
FHLB and Secured Debt
Debt Instrument [Line Items]
Interest expense on deposits, borrowings and junior subordinated debentures										$ 207,000	$ 157,000	$ 469,000

Borrowings - Future Principal

Borrowings - Future Principal Payments Required On The Company's Borrowings (Details) $ in Thousands	Dec. 31, 2017USD ($)
Debt Disclosure [Abstract]
2,018	$ 27,867
2,019	167
2,020	173
2,021	178
2,022	184
Thereafter	6,539
Total	$ 35,108

Junior Subordinated Debentures

Junior Subordinated Debentures (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2005	May 31, 2003
Investment in unconsolidated trust	$ 56,141				$ 56,128				$ 56,141	$ 56,128
Junior subordinated debentures	10,310				18,558				10,310	18,558
Interest expense on deposits, borrowings and junior subordinated debentures	548	$ 602	$ 648	$ 632	$ 631	$ 647	$ 639	$ 644	2,430	2,561	$ 2,871
Northrim Capital Trust 1
Investment in unconsolidated trust													$ 8,000
Junior subordinated debentures	$ 8,200								$ 8,200
LIBOR period									90 days
Basis plus LIBOR									3.15%
Liquidation preference per capital security (in USD per share)	$ 1,000								$ 1,000
Interest expense on deposits, borrowings and junior subordinated debentures									$ 219	319	289
Northrim Statutory Trust 2
Investment in unconsolidated trust												$ 10,000
Junior subordinated debentures	$ 10,300								$ 10,300
LIBOR period									90 days
Basis plus LIBOR									1.37%
Liquidation preference per capital security (in USD per share)	$ 1,000								$ 1,000
Interest rate	2.96%								2.96%
Interest expense on deposits, borrowings and junior subordinated debentures									$ 268	$ 215	$ 174

Employee Benefit Plans (Details

Employee Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2017USD ($)h	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Mandatory work hours per year | h	1,000
Mandatory 401(k) match	$ 0.25
Maximum annual employer 401(k) contribution	6.00%
Amount expensed for 401(k) contributions	$ 904,000	$ 841,000	$ 759,000
Accrued liability for plan	1,500,000	1,600,000
Increase (decrease) in non-qualified deferred compensation plan	(140,000)	199,000	99,000
Aggregate payout under profit sharing plan	1,200,000	1,100,000	1,200,000
Supplemental Employee Retirement Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Contributions to supplemental plan	264,000	299,000	228,000
Accrued liability for plan	2,300,000	2,600,000
RML
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Amount expensed for 401(k) contributions	$ 164,000	190,000	172,000
Term of service required	3 months
Age requirement	20 years 6 months
RML | Supplemental Employee Retirement Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Contributions to supplemental plan	$ 600,000	673,000	$ 692,000
Accrued liability for plan	$ 3,300,000	$ 2,900,000
Vesting period	10 years

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details)	12 Months Ended
	Dec. 31, 2017USD ($)loan	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Loss Contingencies [Line Items]
Rental expense under leases for equipment and premises	$ 2,900,000	$ 2,800,000	$ 2,800,000
Rental income under leases	$ 532,000	424,000	$ 447,000
Limit on stop-loss insurance	1 year
Stop-loss insurance limit per covered individual per year	$ 175,000
Loans repurchased in 2 year interval | loan	1
Total unfunded commitments	$ 335,100,000	309,000,000
Reserve for unfunded loan commitments and letters of credit	152,000	$ 122,000
Expenditure commitments due in 12 months	$ 47,000

Commitments and Contingencie103

Commitments and Contingencies - Schedule of Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,018	$ 2,737
2,019	2,313
2,020	2,021
2,021	1,967
2,022	1,795
Thereafter	9,354
Total	$ 20,187

Commitments and Contingencie104

Commitments and Contingencies - Schedule of Future Minimum Lease Rentals (Details) $ in Thousands	Dec. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,018	$ 657
2,019	672
2,020	686
2,021	521
2,022	166
Thereafter	0
Total	$ 2,702

Commitments and Contingencie105

Commitments and Contingencies - Off-Balance Sheet Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments to extend credit	$ 283,937	$ 236,624
Commitments to originate loans held for sale	43,602	62,421
Standby letters of credit	$ 7,606	$ 9,931

Derivatives - Narrative (Detail

Derivatives - Narrative (Details)	3 Months Ended	12 Months Ended
	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)derivative_swap	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Derivatives, Fair Value [Line Items]
Threshold for collateral requirements		$ 250,000
Collateral posted		300,000	$ 301,000
Notional amount		$ 12,500,000	18,900,000
Number of instruments | derivative_swap		4
Derivative fee income		$ 26,000	0	$ 0
Commitments to originate loans held for sale		43,602,000	62,421,000
RML
Derivatives, Fair Value [Line Items]
Commitments to originate loans held for sale		43,600,000	$ 62,400,000
Variable to Fixed
Derivatives, Fair Value [Line Items]
Notional amount		$ 6,300,000
Number of instruments | derivative_swap		1
Fixed to Variable
Derivatives, Fair Value [Line Items]
Notional amount		$ 6,300,000
Number of instruments | derivative_swap		1
Interest rate swaps | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Cash pledged to collateralize fair value exposure on interest rate swap		$ 400,000
Unrealized gain on interest rate swap		$ 184,000
Subordinated Debt
Derivatives, Fair Value [Line Items]
Junior subordinated debenture	$ 10,000,000
Effective interest rate on junior subordinated debenture	3.72%
Debt instrument, interest rate during period		2.96%
Subordinated Debt | LIBOR
Derivatives, Fair Value [Line Items]
Debt instrument, basis spread on variable rate	1.37%

Derivatives - Schedule of Deriv

Derivatives - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Total other liabilities	$ 77	$ 149
Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative asset	261	71
Total other liabilities	77	71
Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Derivative asset	873	1,137
Retail interest rate contracts
Derivatives, Fair Value [Line Items]
Total other liabilities		78
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset	950	1,208
Total other liabilities	77	149
Not Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative asset	77	71
Total other liabilities	77	71
Not Designated as Hedging Instrument | Interest rate swaps | Other assets
Derivatives, Fair Value [Line Items]
Derivative asset	77	71
Not Designated as Hedging Instrument | Interest rate swaps | Other liabilities
Derivatives, Fair Value [Line Items]
Total other liabilities	77	71
Not Designated as Hedging Instrument | Interest rate lock commitments | Other assets
Derivatives, Fair Value [Line Items]
Derivative asset	873	1,137
Not Designated as Hedging Instrument | Retail interest rate contracts
Derivatives, Fair Value [Line Items]
Total other liabilities		78
Not Designated as Hedging Instrument | Retail interest rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Total other liabilities	$ 0	$ 78

Derivatives - Schedule of De108

Derivatives - Schedule of Derivative Instrument Gain (Loss) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Gain (loss) on derivative not designated as hedging	$ (649)	$ (897)
Interest rate contracts | Other Income
Derivative [Line Items]
Gain (loss) on derivative not designated as hedging	(420)	(530)
Interest rate lock commitments | Other Income
Derivative [Line Items]
Gain (loss) on derivative not designated as hedging	$ (229)	$ (367)

Derivatives - Schedule of Offse

Derivatives - Schedule of Offsetting Asset Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Offsetting Assets [Line Items]
Net amounts of assets and liabilities presented in the Statement of Financial Position	$ 873	$ 1,137
Not Designated as Hedging Instrument
Offsetting Assets [Line Items]
Gross amounts of recognized assets and liabilities	950	1,208
Interest rate swaps
Offsetting Assets [Line Items]
Gross amounts of recognized assets and liabilities	261	71
Interest rate swaps | Not Designated as Hedging Instrument
Offsetting Assets [Line Items]
Gross amounts of recognized assets and liabilities	77	71
Gross amounts offset in the Statement of Financial Position	0	0
Net amounts of assets and liabilities presented in the Statement of Financial Position	77	71
Gross amounts not offset in the Statement of Financial Position, Financial Instruments	0	0
Gross amounts not offset in the Statement of Financial Position, Collateral Posted	0	0
Net Amount	$ 77	$ 71

Derivatives - Schedules of Offs

Derivatives - Schedules of Offsetting Liability Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Offsetting Liabilities [Line Items]
Gross amounts of recognized assets and liabilities	$ 77	$ 149
Interest rate swaps
Offsetting Liabilities [Line Items]
Gross amounts of recognized assets and liabilities	77	71
Retail interest rate contracts
Offsetting Liabilities [Line Items]
Gross amounts of recognized assets and liabilities		78
Not Designated as Hedging Instrument
Offsetting Liabilities [Line Items]
Gross amounts of recognized assets and liabilities	77	149
Not Designated as Hedging Instrument | Interest rate swaps
Offsetting Liabilities [Line Items]
Gross amounts of recognized assets and liabilities	77	71
Gross amounts offset in the Statement of Financial Position	0	0
Net amounts of assets and liabilities presented in the Statement of Financial Position	77	71
Gross amounts not offset in the Statement of Financial Position, Financial Instruments	0	0
Gross amounts not offset in the Statement of Financial Position, Collateral Posted	77	71
Net Amount	$ 0	0
Not Designated as Hedging Instrument | Retail interest rate contracts
Offsetting Liabilities [Line Items]
Gross amounts of recognized assets and liabilities		78
Gross amounts offset in the Statement of Financial Position		0
Net amounts of assets and liabilities presented in the Statement of Financial Position		78
Gross amounts not offset in the Statement of Financial Position, Financial Instruments		0
Gross amounts not offset in the Statement of Financial Position, Collateral Posted		0
Net Amount		$ 78

Common Stock (Details)

Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 22, 2018	Sep. 30, 2002	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Dividends paid to shareholders			$ 5,965	$ 5,372	$ 5,117
Cash dividends paid (in USD per share)			$ 0.86	$ 0.78	$ 0.74
Percentage of common stock authorized for repurchase		5.00%
Remaining shares available under stock repurchase program (in shares)			168,901
Shares repurchased (in shares)			58,341	0
Subsequent Event
Class of Stock [Line Items]
Cash dividends declared (in USD per share)	$ 0.24

Stock-Based Compensation - Nar

Stock-Based Compensation - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exerciseable (in shares)	89,561	119,898	146,335
Options exerciseable, weighted average exercise price (in USD per share)	$ 24.48	$ 21.55	$ 21.20
Total intrinsic value of stock options outstanding and exercisable	$ 670,000	$ 1,200,000	$ 794,000
Stock-based compensation expense	$ 665,000	778,000	608,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation options contractual term	10 years
Stock incentive plan vesting period, years	3 years
Total intrinsic value of stock options exercised	$ 631,000	208,000	82,000
Amount withheld for stock option exercises and related income taxes	1,100,000	1,100,000	358,000
Stock-based compensation expense	152,000	207,000	96,000
Unrecognized compensation expense	$ 309,000
Weighted-average period for recognition of expense	1 year 10 months 1 day
Cash Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from exercise of stock options	$ 69,000	0	169,000
Cashless Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from exercise of stock options	$ 954,000	847,000	201,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan vesting period, years	3 years
Total intrinsic value of stock options exercised	$ 676,000	501,000	510,000
Stock-based compensation expense	513,000	$ 571,000	$ 512,000
Unrecognized compensation expense	$ 1,400,000
Weighted-average period for recognition of expense	2 years 2 months 1 day
Prior Stock Option Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of authorized stock for stock incentive plan (in shares)	0
2017 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of authorized stock for stock incentive plan (in shares)	350,000

Stock-Based Compensation - Ass

Stock-Based Compensation - Assumptions Used To Determine Fair Value of Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Grant date fair value (in USD per share)	$ 6.70	$ 6.31	$ 7.01
Expected life of options	8 years	8 years	8 years
Risk-free interest rate	2.29%	2.15%	2.17%
Dividend yield rate	2.64%	2.85%	2.64%
Price volatility	23.43%	27.37%	28.63%

Stock-Based Compensation - Sto

Stock-Based Compensation - Stock Options Activity (Details)	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Number of Shares
Outstanding at beginning of period (in shares) | shares	173,757
Granted (in shares) | shares	26,112
Forfeited (in shares) | shares	(4,525)
Exercised (in shares) | shares	(51,899)
Outstanding at end of period (in shares) | shares	143,445
Weighted Average Exercise Price
Outstanding at beginning of period (in USD per share) | $ / shares	$ 23.65
Granted (in USD per share) | $ / shares	33.03
Forfeited (in USD per share) | $ / shares	23
Exercised (in USD per share) | $ / shares	19.72
Outstanding at end of period (in USD per share) | $ / shares	$ 26.79
Weighted average remaining contractual life, Outstanding at end of period	5 years 219 days

Stock-Based Compensation - Res

Stock-Based Compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Number of Shares
Outstanding at beginning of period (in shares) | shares	64,901
Granted (in shares) | shares	23,967
Vested (in shares) | shares	(19,727)
Forfeited (in shares) | shares	(3,258)
Outstanding at end of period (in shares) | shares	65,883
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in USD per share) | $ / shares	$ 28.04
Granted (in USD per share) | $ / shares	33.12
Vested (in USD per share) | $ / shares	27.28
Forfeited (in USD per share) | $ / shares	28.28
Outstanding at end of period (in USD per share) | $ / shares	$ 30.10
Weighted average remaining contractual life, Outstanding at end of period	1 year 11 months 15 days

Regulatory Matters - Narrative

Regulatory Matters - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2017	Dec. 31, 2005	Jun. 30, 2003	Dec. 31, 2017	Dec. 31, 2016
Regulatory Capital Requirements [Abstract]
Proceeds from (repurchase of) trust preferred securities	$ (8)	$ 18	$ 18	$ 10	$ 18
Tier 1 common equity, adequately capitalized ratio, conservation buffer				2.50%

Regulatory Matters - Summary of

Regulatory Matters - Summary of Capital Requirements (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Northrim Bancorp, Inc.
Tier One Common Equity Based Capital [Abstract]
Common equity tier 1 capital (to risk-weighted assets), actual amount	$ 177,005	$ 171,190
Common equity tier 1 capital (to risk-weighted assets), actual ratio	13.89%	13.20%
Common equity tier 1 capital (to risk-weighted assets), adequately-capitalized amount	$ 57,345	$ 58,360
Common equity tier 1 capital (to risk-weighted assets), adequately-capitalized ratio	4.50%	4.50%
Capital [Abstract]
Total Capital (to risk-weighted assets), actual amount	$ 202,638	$ 204,927
Total Capital (to risk-weighted assets), actual ratio	15.90%	15.80%
Total Capital (to risk-weighted assets), adequately-capitalized amount	$ 101,956	$ 103,761
Total Capital (to risk-weighted assets), adequately-capitalized ratio	8.00%	8.00%
Tier One Risk Based Capital [Abstract]
Tier 1 Capital (to risk-weighted assets), actual amount	$ 186,637	$ 188,658
Tier 1 Capital (to risk-weighted assets), actual ratio	14.65%	14.54%
Tier 1 Capital (to risk-weighted assets), adequately-capitalized amount	$ 76,438	$ 77,851
Tier 1 capital (to risk-weighted assets), adequately capitalized ratio	6.00%	6.00%
Tier One Leverage Capital [Abstract]
Tier I Capital (to average assets), actual amount	$ 186,637	$ 188,658
Tier I Capital (to average assets), actual ratio	12.41%	12.59%
Tier I Capital (to average assets), adequately-capitalized amount	$ 60,157	$ 59,939
Tier 1 capital (to average assets), adequately-capitalized ratio	4.00%	4.00%
Northrim Bank
Tier One Common Equity Based Capital [Abstract]
Common equity tier 1 capital (to risk-weighted assets), actual amount	$ 161,996	$ 168,529
Common equity tier 1 capital (to risk-weighted assets), actual ratio	12.83%	13.07%
Common equity tier 1 capital (to risk-weighted assets), adequately-capitalized amount	$ 56,819	$ 58,025
Common equity tier 1 capital (to risk-weighted assets), adequately-capitalized ratio	4.50%	4.50%
Common equity tier 1 capital (to risk-weighted assets), well-capitalized amount	$ 82,071	$ 83,813
Common equity tier 1 capital (to risk-weighted assets), well-capitalized ratio	6.50%	6.50%
Capital [Abstract]
Total Capital (to risk-weighted assets), actual amount	$ 177,857	$ 184,695
Total Capital (to risk-weighted assets), actual ratio	14.08%	14.33%
Total Capital (to risk-weighted assets), adequately-capitalized amount	$ 101,055	$ 103,110
Total Capital (to risk-weighted assets), adequately-capitalized ratio	8.00%	8.00%
Total Capital (to risk-weighted assets), well-capitalized amount	$ 126,319	$ 128,887
Total Capital (to risk-weighted assets), well-capitalized ratio	10.00%	10.00%
Tier One Risk Based Capital [Abstract]
Tier 1 Capital (to risk-weighted assets), actual amount	$ 161,996	$ 168,529
Tier 1 Capital (to risk-weighted assets), actual ratio	12.83%	13.07%
Tier 1 Capital (to risk-weighted assets), adequately-capitalized amount	$ 75,758	$ 77,366
Tier 1 capital (to risk-weighted assets), adequately capitalized ratio	6.00%	6.00%
Tier 1 Capital (to risk-weighted assets), well-capitalized amount	$ 101,011	$ 103,155
Tier 1 Capital (to risk-weighted assets), well-capitalized ratio	8.00%	8.00%
Tier One Leverage Capital [Abstract]
Tier I Capital (to average assets), actual amount	$ 161,996	$ 168,529
Tier I Capital (to average assets), actual ratio	10.87%	11.30%
Tier I Capital (to average assets), adequately-capitalized amount	$ 59,612	$ 59,656
Tier 1 capital (to average assets), adequately-capitalized ratio	4.00%	4.00%
Tier I Capital (to average assets), well-capitalized amount	$ 74,515	$ 74,570
Tier I Capital (to average assets), well-capitalized ratio	5.00%	5.00%

Income Taxes - Narrative (Deta

Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Taxes receivable	$ 5,331,000	$ 1,755,000
Tax credits related to low income housing partnerships	$ 3,468,000	$ 3,540,000	$ 2,446,000
U.S. tax rate	35.00%	35.00%	35.00%
Unrecognized tax benefits	$ 0
Penalties and interest expense	$ 0	$ 0	$ 0

Income Taxes - Components Of T

Income Taxes - Components Of The Provision For Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current Tax Expense (Benefit)
Federal									$ 2,618	$ 2,874	$ 4,752
State									1,423	674	1,200
Amortization of investment in low income housing tax credit partnerships									2,276	2,868	2,684
Total									6,317	6,416	8,636
Deferred Expense (Benefit)
Federal									3,658	(281)	127
State									346	(83)	21
Amortization of investment in low income housing tax credit partnerships									0	0	0
Total									4,004	(364)	148
Total Expense
Federal									6,276	2,593	4,879
State									1,769	591	1,221
Amortization of investment in low income housing tax credit partnerships									2,276	2,868	2,684
Total	$ 4,085	$ 2,980	$ 1,455	$ 1,801	$ 1,458	$ 1,027	$ 1,868	$ 1,699	$ 10,321	$ 6,052	$ 8,784

Income Taxes - Reconciliation

Income Taxes - Reconciliation Of Actual To Expected Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Computed “expected” income tax expense									$ 8,330	$ 7,365	$ 9,491
State income taxes, net									1,225	384	794
Tax-exempt interest on investment securities									(597)	(566)	(507)
Amortization of investment in low income housing tax credit partnerships									2,276	2,868	2,684
Low income housing credits									(3,468)	(3,540)	(2,446)
Revaluation of deferred tax assets									2,678	0	0
Other									(123)	(459)	(1,232)
Total	$ 4,085	$ 2,980	$ 1,455	$ 1,801	$ 1,458	$ 1,027	$ 1,868	$ 1,699	$ 10,321	$ 6,052	$ 8,784

Income Taxes - Components O121

Income Taxes - Components Of The Net Deferred Tax Asset (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Asset:
Allowance for loan losses	$ 5,922	$ 7,717	$ 7,082
Loan fees, net of costs	825	1,823	1,896
Other real estate owned	160	123	46
Deferred compensation	1,218	2,112	2,005
Net operating loss carryforwards	0	0	73
Equity compensation	422	544	578
Loan discount	171	326	476
Fair market value adjustment on certificates of deposit	147	247	283
Unrealized loss on available for sale investment securities, net	59	195	235
Other	693	1,455	1,380
Total Deferred Tax Asset	9,617	14,542	14,054
Deferred Tax Liability:
Intangible amortization	(219)	(2,804)	(2,494)
Mortgage servicing rights	(2,156)	(415)	(415)
Depreciation and amortization	(404)	31	(64)
FHLB stock repurchase and dividends	(179)	(686)	(686)
Other	(399)	(404)	(456)
Total Deferred Tax Liability	(3,357)	(4,278)	(4,115)
Net Deferred Tax Asset	$ 6,260	$ 10,264	$ 9,939

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Term of purchased receivables	1 year

Fair Value Measurements - Sched

Fair Value Measurements - Schedule Of Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial assets:
Purchased receivables, net	$ 22,231	$ 20,491
Mortgage servicing rights	7,305	4,157
Financial liabilities:
Derivative liability	77	149
Level 1 inputs
Financial assets:
Mortgage servicing rights	0	0
Financial liabilities:
Derivative liability	0	0
Level 1 inputs | Carrying Amount
Financial assets:
Cash, due from banks and deposits in other banks	77,841	50,551
Investment securities	59,117	43,486
Level 1 inputs | Fair Value
Financial assets:
Cash, due from banks and deposits in other banks	77,841	50,551
Investment securities	59,117	43,486
Level 2 inputs
Financial assets:
Mortgage servicing rights	0	0
Financial liabilities:
Derivative liability	77	149
Level 2 inputs | Carrying Amount
Financial assets:
Investment securities	253,633	288,632
Investment in Federal Home Loan Bank Stock	2,115	1,965
Accrued interest receivable	4,385	3,734
Financial liabilities:
Deposits	1,258,283	1,267,653
Securities sold under repurchase agreements	27,746	27,607
Borrowings	7,362	4,338
Accrued interest payable	24	64
Level 2 inputs | Fair Value
Financial assets:
Investment securities	253,633	288,655
Investment in Federal Home Loan Bank Stock	2,115	1,965
Accrued interest receivable	4,385	3,734
Financial liabilities:
Deposits	1,257,670	1,266,995
Securities sold under repurchase agreements	27,746	27,607
Borrowings	7,308	4,186
Accrued interest payable	24	64
Level 3 inputs
Financial assets:
Mortgage servicing rights	7,305	4,157
Financial liabilities:
Derivative liability	0	0
Level 3 inputs | Carrying Amount
Financial assets:
Loans and loans held for sale	999,445	1,018,611
Purchased receivables, net	22,231	20,491
Mortgage servicing rights	7,305	4,157
Financial liabilities:
Accrued liability, RML acquisition payments	0	186
Junior subordinated debentures	10,310	18,558
Level 3 inputs | Fair Value
Financial assets:
Loans and loans held for sale	1,001,346	1,026,350
Purchased receivables, net	22,231	20,491
Mortgage servicing rights	7,305	4,157
Financial liabilities:
Accrued liability, RML acquisition payments	0	186
Junior subordinated debentures	9,856	18,398
Interest rate swaps
Financial assets:
Derivative asset	261	71
Financial liabilities:
Derivative liability	77	71
Interest rate swaps | Level 1 inputs
Financial assets:
Derivative asset	0	0
Financial liabilities:
Derivative liability	0	0
Interest rate swaps | Level 2 inputs
Financial assets:
Derivative asset	261	71
Financial liabilities:
Derivative liability	77	71
Interest rate swaps | Level 2 inputs | Carrying Amount
Financial assets:
Derivative asset	261	71
Financial liabilities:
Derivative liability	77	71
Interest rate swaps | Level 2 inputs | Fair Value
Financial assets:
Derivative asset	261	71
Financial liabilities:
Derivative liability	77	71
Interest rate swaps | Level 3 inputs
Financial assets:
Derivative asset	0	0
Financial liabilities:
Derivative liability	0	0
Interest rate lock commitments
Financial assets:
Derivative asset	873	1,137
Interest rate lock commitments | Level 1 inputs
Financial assets:
Derivative asset	0	0
Interest rate lock commitments | Level 2 inputs
Financial assets:
Derivative asset	0	0
Interest rate lock commitments | Level 3 inputs
Financial assets:
Derivative asset	873	1,137
Interest rate lock commitments | Level 3 inputs | Carrying Amount
Financial assets:
Derivative asset	873	1,137
Interest rate lock commitments | Level 3 inputs | Fair Value
Financial assets:
Derivative asset	873	1,137
Retail interest rate contracts
Financial liabilities:
Derivative liability		78
Retail interest rate contracts | Level 1 inputs
Financial liabilities:
Derivative liability		0
Retail interest rate contracts | Level 2 inputs
Financial liabilities:
Derivative liability		78
Retail interest rate contracts | Level 2 inputs | Carrying Amount
Financial liabilities:
Derivative liability	0	78
Retail interest rate contracts | Level 2 inputs | Fair Value
Financial liabilities:
Derivative liability	$ 0	78
Retail interest rate contracts | Level 3 inputs
Financial liabilities:
Derivative liability		$ 0

Fair Value Measurements - Sc124

Fair Value Measurements - Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 312,750	$ 331,219
Mortgage servicing rights	7,305	4,157
Total other assets	8,439	5,365
Derivative liability	77	149
Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	59,117	43,486
Mortgage servicing rights	0	0
Total other assets	0	0
Derivative liability	0	0
Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	253,633	287,733
Mortgage servicing rights	0	0
Total other assets	261	71
Derivative liability	77	149
Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Mortgage servicing rights	7,305	4,157
Total other assets	8,178	5,294
Derivative liability	0	0
U.S. Treasury and government sponsored entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	249,461	263,361
U.S. Treasury and government sponsored entities | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	49,878	30,063
U.S. Treasury and government sponsored entities | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	199,583	233,298
U.S. Treasury and government sponsored entities | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	14,421	18,157
Municipal securities | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Municipal securities | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	14,421	18,157
Municipal securities | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
U.S. Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		2
U.S. Agency mortgage-backed securities | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		0
U.S. Agency mortgage-backed securities | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		2
U.S. Agency mortgage-backed securities | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		0
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	37,132	44,732
Corporate bonds | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	3,508	8,456
Corporate bonds | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	33,624	36,276
Corporate bonds | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Collateralized loan obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	6,005
Collateralized loan obligations | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0
Collateralized loan obligations | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	6,005
Collateralized loan obligations | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0
Preferred stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	5,731	4,967
Preferred stock | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	5,731	4,967
Preferred stock | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Preferred stock | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	261	71
Derivative liability	77	71
Interest rate swaps | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Interest rate swaps | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	261	71
Derivative liability	77	71
Interest rate swaps | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	873	1,137
Interest rate lock commitments | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Interest rate lock commitments | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Interest rate lock commitments | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	$ 873	1,137
Retail interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability		78
Retail interest rate contracts | Level 1 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability		0
Retail interest rate contracts | Level 2 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability		78
Retail interest rate contracts | Level 3 inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability		$ 0

Fair Value Measurements - Recon

Fair Value Measurements - Reconciliation of Assets with Unobservable Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 5,294	$ 3,168
Change included in earnings	(1,613)	(2,589)
Purchases and issuances	18,230	23,641
Sales and settlements	(13,733)	(18,926)
Ending balance	8,178	5,294
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	4,157	1,654
Change included in earnings	2	(526)
Purchases and issuances	3,146	3,029
Sales and settlements	0	0
Ending balance	7,305	4,157
Interest rate lock commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,137	1,514
Change included in earnings	(1,615)	(2,063)
Purchases and issuances	15,084	20,612
Sales and settlements	(13,733)	(18,926)
Ending balance	$ 873	$ 1,137

Fair Value Measurements - Sc126

Fair Value Measurements - Schedule of Assets with Unobservable Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	$ 14,207	$ 10,922
Nonrecurring assets, loss	1,942	457	$ 630
Level 1 inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	0	0
Level 2 inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	0	0
Level 3 inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	14,207	10,922
Loans measured for impairment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	7,988	9,222
Nonrecurring assets, loss	352	270	269
Loans measured for impairment | Level 1 inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	0	0
Loans measured for impairment | Level 2 inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	0	0
Loans measured for impairment | Level 3 inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	7,988	9,222
Other real estate owned
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	3,927	1,700
Nonrecurring assets, loss	904	187	361
Other real estate owned | Level 1 inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	0	0
Other real estate owned | Level 2 inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	0	0
Other real estate owned | Level 3 inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	3,927	1,700
Other assets - equity method investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	2,292
Nonrecurring assets, loss	686	$ 0	$ 0
Other assets - equity method investment | Level 1 inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	0
Other assets - equity method investment | Level 2 inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	0
Other assets - equity method investment | Level 3 inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Nonrecurring assets	$ 2,292

Fair Value Measurements - Sc127

Fair Value Measurements - Schedule of Valuation Assumptions (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loans measured for impairment | Income Approach Valuation Technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	7.00%	7.00%
Loans measured for impairment | Income Approach Valuation Technique | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	32.00%	49.00%
Loans measured for impairment | Income Approach Valuation Technique | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	40.00%	100.00%
Other real estate owned | Market Approach Valuation Technique | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated capital costs to complete improvements	25.00%	11.50%
Other real estate owned | Market Approach Valuation Technique | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated capital costs to complete improvements	32.00%	25.00%
Interest rate lock commitments | Income Approach Valuation Technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pull through rate	93.05%	93.00%
Mortgage servicing rights | Income Approach Valuation Technique | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	9.42%	9.21%
Constant prepayment rate	8.94%	11.20%
Mortgage servicing rights | Income Approach Valuation Technique | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	10.05%	10.75%
Constant prepayment rate	11.34%	21.29%

Segment Information - Narrative

Segment Information - Narrative (Details)	12 Months Ended
	Dec. 31, 2017segmentbank
Segment Reporting Information [Line Items]
Number of operating segments | segment	2
Community Banking
Segment Reporting Information [Line Items]
Number of branches | bank	14

Segment Information - Schedule

Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total interest income	$ 15,232	$ 15,519	$ 14,892	$ 14,465	$ 14,522	$ 14,860	$ 14,718	$ 14,818	$ 60,108	$ 58,918	$ 59,780
Interest expense	548	602	648	632	631	647	639	644	2,430	2,561	2,871
Net Interest Income	14,684	14,917	14,244	13,833	13,891	14,213	14,079	14,174	57,678	56,357	56,909
Provision (benefit) for loan losses	0	2,500	300	400	743	652	200	703	3,200	2,298	1,754
Other operating income	7,952	13,855	9,762	8,905	10,359	11,935	11,864	9,105	40,474	43,263	44,608
Compensation expense - RML acquisition payments	(193)	149	0	174	708	3,250	687	130	130	4,775	4,094
Other operating expense	18,530	17,542	18,510	16,441	17,646	17,936	18,682	17,241	71,023	71,505	68,551
Income Before Provision for Income Taxes	4,299	8,581	5,196	5,723	5,153	4,310	6,374	5,205	23,799	21,042	27,118
Provision for income taxes	4,085	2,980	1,455	1,801	1,458	1,027	1,868	1,699	10,321	6,052	8,784
Net Income	214	5,601	3,741	3,922	3,695	3,283	4,506	3,506	13,478	14,990	18,334
Less: Net income attributable to the noncontrolling interest	0	78	152	97	105	188	156	130	327	579	551
Net Income Attributable to Northrim BanCorp, Inc.	214	$ 5,523	$ 3,589	$ 3,825	3,590	$ 3,095	$ 4,350	$ 3,376	13,151	14,411	17,783
Total assets	1,519,109				1,526,540				1,519,109	1,526,540	1,499,492
Loans held for sale	43,778				43,596				43,778	43,596	50,553
Community Banking
Segment Reporting Information [Line Items]
Total interest income									58,308	56,986	57,729
Interest expense									1,860	1,739	1,796
Net Interest Income									56,448	55,247	55,933
Provision (benefit) for loan losses									3,200	2,298	1,754
Other operating income									17,187	13,756	14,995
Compensation expense - RML acquisition payments									130	4,775	4,094
Other operating expense									50,271	48,610	47,070
Income Before Provision for Income Taxes									20,034	13,320	18,010
Provision for income taxes									9,499	2,867	5,024
Net Income									10,535	10,453	12,986
Less: Net income attributable to the noncontrolling interest									327	579	551
Net Income Attributable to Northrim BanCorp, Inc.									10,208	9,874	12,435
Total assets	1,453,115				1,459,950				1,453,115	1,459,950	1,431,759
Loans held for sale	0				0				0	0	0
Home Mortgage Lending
Segment Reporting Information [Line Items]
Total interest income									1,800	1,932	2,051
Interest expense									570	822	1,075
Net Interest Income									1,230	1,110	976
Provision (benefit) for loan losses									0	0	0
Other operating income									23,287	29,507	29,613
Compensation expense - RML acquisition payments									0	0	0
Other operating expense									20,752	22,895	21,481
Income Before Provision for Income Taxes									3,765	7,722	9,108
Provision for income taxes									822	3,185	3,760
Net Income									2,943	4,537	5,348
Less: Net income attributable to the noncontrolling interest									0	0	0
Net Income Attributable to Northrim BanCorp, Inc.									2,943	4,537	5,348
Total assets	65,994				66,590				65,994	66,590	67,733
Loans held for sale	$ 43,778				$ 43,596				$ 43,778	$ 43,596	$ 50,553

Parent Company Information - B

Parent Company Information - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 77,841	$ 50,551	$ 58,673	$ 68,556
Investment securities available for sale	312,750	331,219
Other assets	56,141	56,128
Total assets	1,519,109	1,526,540	1,499,492
LIABILITIES
Junior subordinated debentures	10,310	18,558
Other liabilities	22,606	21,672
Total liabilities	1,326,307	1,339,828
SHAREHOLDERS' EQUITY
Common stock	6,872	6,898
Additional paid-in capital	61,793	62,952
Retained earnings	124,407	117,141
Accumulated other comprehensive loss	(270)	(397)
Total Northrim BanCorp, Inc. shareholders' equity	192,802	186,594
Total liabilities and shareholders' equity	1,519,109	1,526,540
Northrim Bancorp, Inc.
ASSETS
Cash and cash equivalents	15,872	11,963	$ 10,258	$ 6,890
Investment securities available for sale	5,731	4,967
Other assets	1,951	2,248
Total assets	203,157	205,734
LIABILITIES
Junior subordinated debentures	10,310	18,558
Other liabilities	45	582
Total liabilities	10,355	19,140
SHAREHOLDERS' EQUITY
Common stock	6,872	6,898
Additional paid-in capital	61,793	62,952
Retained earnings	124,322	117,141
Accumulated other comprehensive loss	(185)	(397)
Total Northrim BanCorp, Inc. shareholders' equity	192,802	186,594
Total liabilities and shareholders' equity	203,157	205,734
Northrim Bancorp, Inc. | Northrim Bank
ASSETS
Investment in subsidiary	177,824	184,511
Northrim Bancorp, Inc. | Northrim Investment Services Company
ASSETS
Investment in subsidiary	1,469	1,487
Northrim Bancorp, Inc. | Northrim Capital Trust 1
ASSETS
Investment in subsidiary	0	248
Northrim Bancorp, Inc. | Northrim Statutory Trust 2
ASSETS
Investment in subsidiary	$ 310	$ 310

Parent Company Information - S

Parent Company Information - Statements Of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income
Interest income	$ 15,232	$ 15,519	$ 14,892	$ 14,465	$ 14,522	$ 14,860	$ 14,718	$ 14,818	$ 60,108	$ 58,918	$ 59,780
Other income	7,952	13,855	9,762	8,905	10,359	11,935	11,864	9,105	40,474	43,263	44,608
Expense
Interest expense	548	602	648	632	631	647	639	644	2,430	2,561	2,871
Income Before Provision for Income Taxes	4,299	8,581	5,196	5,723	5,153	4,310	6,374	5,205	23,799	21,042	27,118
Benefit from income taxes	4,085	2,980	1,455	1,801	1,458	1,027	1,868	1,699	10,321	6,052	8,784
Net income attributable to Northrim BanCorp, Inc.	$ 214	$ 5,523	$ 3,589	$ 3,825	$ 3,590	$ 3,095	$ 4,350	$ 3,376	13,151	14,411	17,783
Northrim Bancorp, Inc.
Income
Interest income									408	369	116
Equity in undistributed earnings from subsidiaries									14,101	15,396	19,005
Other income									52	0	175
Total Income									14,585	15,765	19,296
Expense
Interest expense									516	534	463
Administrative and other expenses									2,242	2,382	2,191
Total Expense									2,758	2,916	2,654
Income Before Provision for Income Taxes									11,827	12,849	16,642
Benefit from income taxes									(1,324)	(1,562)	(1,141)
Net income attributable to Northrim BanCorp, Inc.									13,151	14,411	17,783
Northrim Bancorp, Inc. | Northrim Bank
Income
Equity in undistributed earnings from subsidiaries									14,003	15,301	18,865
Northrim Bancorp, Inc. | Northrim Investment Services Company
Income
Equity in undistributed earnings from subsidiaries									$ 122	$ 95	$ 140

Parent Company Information 132

Parent Company Information - Statements Of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities:
Net income	$ 214	$ 5,523	$ 3,589	$ 3,825	$ 3,590	$ 3,095	$ 4,350	$ 3,376	$ 13,151	$ 14,411	$ 17,783
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Stock-based compensation									665	778	608
Net Cash Provided by Operating Activities									19,284	20,123	10,635
Investing Activities:
Purchases of investment securities available for sale									(84,339)	(145,707)	(210,308)
Net Cash Provided (Used) by Investing Activities									30,378	(47,499)	(63,455)
Financing Activities:
Dividends paid to shareholders									(5,965)	(5,372)	(5,117)
Repurchase of common stock									(1,607)	0	0
Net Cash (Used) Provided by Financing Activities									(22,372)	19,254	42,937
Net Change in Cash and Cash Equivalents									27,290	(8,122)	(9,883)
Cash and Cash Equivalents at Beginning of Year				50,551				58,673	50,551	58,673	68,556
Cash and Cash Equivalents at End of Year	77,841				50,551				77,841	50,551	58,673
Northrim Bancorp, Inc.
Operating Activities:
Net income									13,151	14,411	17,783
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Equity in undistributed earnings from subsidiaries									(14,101)	(15,396)	(19,005)
Stock-based compensation									665	778	608
Changes in other assets and liabilities									176	(1,458)	(298)
Net Cash Provided by Operating Activities									(109)	(1,665)	(912)
Investing Activities:
Purchases of investment securities available for sale									(499)	(1,373)	(3,549)
Proceeds from sales/calls/maturities of securities available for sale									0	0	2,998
Investment in Northrim Bank, NISC, NCT1 & NST2									11,989	10,115	9,842
Net Cash Provided (Used) by Investing Activities									11,490	8,742	9,291
Financing Activities:
Dividends paid to shareholders									(5,965)	(5,372)	(5,117)
Proceeds from issuance of common stock and excess tax benefits									100	0	106
Repurchase of common stock									(1,607)	0	0
Net Cash (Used) Provided by Financing Activities									(7,472)	(5,372)	(5,011)
Net Change in Cash and Cash Equivalents									3,909	1,705	3,368
Cash and Cash Equivalents at Beginning of Year				$ 11,963				$ 10,258	11,963	10,258	6,890
Cash and Cash Equivalents at End of Year	$ 15,872				$ 11,963				$ 15,872	$ 11,963	$ 10,258

Quarterly Results of Operati133

Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Data [Abstract]
Total interest income	$ 15,232	$ 15,519	$ 14,892	$ 14,465	$ 14,522	$ 14,860	$ 14,718	$ 14,818	$ 60,108	$ 58,918	$ 59,780
Total interest expense	548	602	648	632	631	647	639	644	2,430	2,561	2,871
Net Interest Income	14,684	14,917	14,244	13,833	13,891	14,213	14,079	14,174	57,678	56,357	56,909
Provision for loan losses	0	2,500	300	400	743	652	200	703	3,200	2,298	1,754
Other operating income	7,952	13,855	9,762	8,905	10,359	11,935	11,864	9,105	40,474	43,263	44,608
Compensation expense - RML acquisition payments	(193)	149	0	174	708	3,250	687	130	130	4,775	4,094
Other operating expense	18,530	17,542	18,510	16,441	17,646	17,936	18,682	17,241	71,023	71,505	68,551
Income Before Provision for Income Taxes	4,299	8,581	5,196	5,723	5,153	4,310	6,374	5,205	23,799	21,042	27,118
Provision for income taxes	4,085	2,980	1,455	1,801	1,458	1,027	1,868	1,699	10,321	6,052	8,784
Net Income	214	5,601	3,741	3,922	3,695	3,283	4,506	3,506	13,478	14,990	18,334
Less: Net income attributable to the noncontrolling interest	0	78	152	97	105	188	156	130	327	579	551
Net Income Attributable to Northrim BanCorp, Inc.	$ 214	$ 5,523	$ 3,589	$ 3,825	$ 3,590	$ 3,095	$ 4,350	$ 3,376	$ 13,151	$ 14,411	$ 17,783
Earnings per share, basic (in USD per share)	$ 0.03	$ 0.80	$ 0.52	$ 0.55	$ 0.52	$ 0.45	$ 0.63	$ 0.49	$ 1.91	$ 2.09	$ 2.59
Earnings per share, diluted (in USD per share)	$ 0.03	$ 0.79	$ 0.51	$ 0.55	$ 0.51	$ 0.44	$ 0.63	$ 0.48	$ 1.88	$ 2.06	$ 2.56