Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities:
Net income	$ 20,004	$ 13,478	$ 14,990
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Loss (gain) on sale of securities, net	0	(11)	11
Loss on sale of premises and equipment	2	3	352
Gain on sale of Northrim Benefits Group	0	(4,445)	0
Depreciation and amortization of premises and equipment	2,283	2,867	2,439
Amortization of software	911	675	157
Intangible asset amortization	70	100	135
Amortization of investment security premium, net of discount accretion	199	332	27
Change in fair value of marketable equity securities	625	0	0
Deferred tax expense (benefit)	3,014	4,004	(325)
Stock-based compensation	816	665	778
Excess tax expense from share-based payment arrangements	0	0	63
Deferral of loan fees and costs, net	331	(278)	(178)
(Benefit) provision for loan losses	(500)	3,200	2,298
(Benefit) reserve for purchased receivables	(10)	29	(10)
Originations of home mortgage servicing rights carried at fair value	(3,641)	(3,146)	(3,029)
Change in fair value of home mortgage servicing rights carried at fair value	125	(2)	526
Change in fair value of commercial servicing rights carried at fair value	(972)	0	0
Gain on sale of loans	(14,822)	(18,013)	(25,413)
Proceeds from the sale of loans held for sale	551,607	571,909	768,169
Origination of loans held for sale	(527,516)	(554,078)	(735,799)
Gain on sale of other real estate owned	(3)	(371)	(295)
Impairment on other real estate owned	0	904	187
Impairment on equity method investment	804	686	0
Net changes in assets and liabilities:
Increase in accrued interest receivable	(432)	(651)	(114)
(Increase) decrease in other assets	(2,512)	841	10,015
Increase (decrease) in other liabilities	(5,233)	586	(14,861)
Net Cash Provided by Operating Activities	25,150	19,284	20,123
Investment in securities:
Purchases of investment securities available for sale	(88,139)	(84,339)	(145,707)
Purchases of marketable equity securities	(2,992)	0	0
Purchases of FHLB stock	0	(3,665)	(751)
Proceeds from sales/calls/maturities of securities available for sale	122,644	102,660	105,621
Proceeds from calls/maturities of marketable equity securities	783	0	0
Proceeds from calls/maturities of securities held to maturity	0	890	0
Proceeds from redemption of FHLB stock	14	3,515	602
(Increase) decrease in purchased receivables, net	7,835	(1,769)	(7,155)
(Increase) decrease in loans, net	(31,852)	12,278	1,160
Proceeds from sale of other real estate owned	1,522	3,302	934
Proceeds from the sale of Northrim Benefits Group	0	4,625	0
Investment in other real estate owned	(144)	0	(311)
Purchases of software	(517)	(5,680)	0
Proceeds from sales of premises and equipment	3	116	1,401
Purchases of premises and equipment	(3,511)	(1,555)	(3,293)
Net Cash Provided (Used) by Investing Activities	5,646	30,378	(47,499)
Financing Activities:
(Decrease) increase in deposits	(30,195)	(9,370)	26,861
Increase (decrease) in securities sold under repurchase agreements	6,532	139	(3,813)
Proceeds from borrowings	0	3,097	2,265
Repayments of borrowings	(121)	(73)	(47)
Distributions to noncontrolling interest	0	(445)	(640)
Repayment of junior subordinated debentures	0	(8,248)	0
Proceeds from the issuance of common stock	243	100	0
Repurchase of common stock	(494)	(1,607)	0
Cash dividends paid	(7,064)	(5,965)	(5,372)
Net Cash (Used) Provided by Financing Activities	(31,099)	(22,372)	19,254
Net Change in Cash and Cash Equivalents	(303)	27,290	(8,122)
Cash and Cash Equivalents at Beginning of Year	77,841	50,551	58,673
Cash and Cash Equivalents at End of Year	77,538	77,841	50,551
Supplemental Information:
Income taxes paid	1,766	7,764	4,414
Interest paid	2,971	2,470	2,553
Noncash commitments to invest in Low Income Housing Tax Credit Partnerships	0	0	6,809
Transfer of loans to other real estate owned	686	5,912	4,036
Cash dividends declared but not paid	$ 72	$ 53	$ 48