Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Non-controlling Interest
Beginning balance, value at Dec. 31, 2012	$ 136,353	$ 6,512	$ 53,638	$ 74,742	$ 1,368	$ 93
Beginning balance, shares at Dec. 31, 2012		6,512,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend declared	(4,212)			(4,212)
Stock based compensation expense	506		506
Exercise of stock options, shares		26,000
Exercise of stock options	(129)	26	(155)
Excess tax benefits from share-based payment arrangements	100		100
Distributions to noncontrolling interest	(13)					(13)
Change in unrealized holding (loss) on available for sale securities, net of tax	(699)				(699)
Net income attributable to the noncontrolling interest	87					87
Net income attributable to Northrim BanCorp	12,325			12,325
Ending balance, value at Dec. 31, 2013	144,318	6,538	54,089	82,855	669	167
Ending balance, shares at Dec. 31, 2013	6,537,652	6,538,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Acquisition adjustment, shares		290,000
Acquisition adjustment, value	7,446	290	7,156
Cash dividend declared	(3,526)			(3,526)
Stock based compensation expense	254		254
Exercise of stock options, shares		6,000
Exercise of stock options	75	6	69
Excess tax benefits from share-based payment arrangements	5		5
Distributions to noncontrolling interest	(341)					(341)
Change in unrealized holding (loss) on available for sale securities, net of tax	(23)				(23)
Net income attributable to the noncontrolling interest	329					329
Net income attributable to Northrim BanCorp	10,734			10,734
Ending balance, value at Sep. 30, 2014	$ 159,271	$ 6,834	$ 61,573	$ 90,063	$ 646	$ 155
Ending balance, shares at Sep. 30, 2014	6,834,101	6,834,000