Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Non-controlling Interest
Beginning balance, value at Dec. 31, 2011	$ 125,435	$ 6,467	$ 53,164	$ 65,469	$ 283	$ 52
Beginning balance, shares at Dec. 31, 2011		6,467,000
Cash dividend declared	(3,673)			(3,673)
Stock based compensation expense	454		454
Exercise of stock options, shares		45,000
Exercise of stock options	(168)	45	(213)
Excess tax benefits from share-based payment arrangements	233		233
Distributions to noncontrolling interest	(471)					(471)
Change in unrealized holding (loss) on available for sale securities, net of tax	1,085				1,085
Net income attributable to the noncontrolling interest	512					512
Net income attributable to Northrim Bancorp	12,946			12,946
Ending balance, value at Dec. 31, 2012	136,353	6,512	53,638	74,742	1,368	93
Ending balance, shares at Dec. 31, 2012		6,512,000
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
Cash dividend declared	(4,770)			(4,770)
Stock based compensation expense	360		360
Exercise of stock options, shares		26,000
Exercise of stock options	54	26	28
Excess tax benefits from share-based payment arrangements	96		96
Distributions to noncontrolling interest	(508)					(508)
Change in unrealized holding (loss) on available for sale securities, net of tax	(422)				(422)
Net income attributable to the noncontrolling interest	459					459
Net income attributable to Northrim Bancorp	17,408			17,408
Stock Issued During Period, Shares, Acquisitions		290,000
Stock Issued During Period, Value, Acquisitions	7,446	290	7,156
Ending balance, value at Dec. 31, 2014	$ 164,441	$ 6,854	$ 61,729	$ 95,493	$ 247	$ 118
Ending balance, shares at Dec. 31, 2014	6,854,189	6,854,000