Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Non-controlling Interest [Member]	Total
Beginning balance, value at Dec. 31, 2009	$ 6,371	$ 52,139	$ 51,121	$ 1,341	$ 48	$ 111,020
Beginning balance, shares at Dec. 31, 2009	6,371,000
Cash dividend declared			(2,848)			(2,848)
Exercise of stock options, shares	56,000
Exercise of stock options	56	(132)				(76)
Excess tax benefits from share-based payment		185				185
Distributions to noncontrolling interest					(397)	(397)
Change in unrealized holding gain on available for sale securities, net of tax				(693)		(693)
Net income attributable to the noncontrolling interest					399	399
Net income attributable to Northrim BanCorp			9,066			9,066
Ending balance, value at Dec. 31, 2010	6,427	52,658	57,339	648	50	117,122
Ending balance, shares at Dec. 31, 2010	6,427,000
Cash dividend declared			(3,268)			(3,268)
Stock based compensation expense		519				519
Exercise of stock options, shares	40,000
Exercise of stock options	40	(184)				(144)
Excess tax benefits from share-based payment		171				171
Distributions to noncontrolling interest					(427)	(427)
Change in unrealized holding gain on available for sale securities, net of tax				(365)		(365)
Net income attributable to the noncontrolling interest					429	429
Net income attributable to Northrim BanCorp			11,398			11,398
Ending balance, value at Dec. 31, 2011	6,467	53,164	65,469	283	52	125,435
Ending balance, shares at Dec. 31, 2011	6,467,000					6,466,763
Cash dividend declared			(3,673)			(3,673)
Stock based compensation expense		454				454
Exercise of stock options, shares	45,000
Exercise of stock options	45	(213)				(168)
Excess tax benefits from share-based payment		233				233
Distributions to noncontrolling interest					(471)	(471)
Change in unrealized holding gain 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	$ 6,512	$ 53,638	$ 74,742	$ 1,368	$ 93	$ 136,353
Ending balance, shares at Dec. 31, 2012	6,512,000					6,511,649