Consolidated Statements Of Changes In Shareholders' Equity And Comprehensive Income (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling 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			(1,293)			(1,293)
Stock option expense		258				258
Exercise of stock options, shares	16,000
Exercise of stock options	16	(15)				1
Excess tax benefits from share-based payment arrangements		102				102
Distributions to noncontrolling interest					(141)	(141)
Comprehensive income:
Change in unrealized holding gain (loss) on available for sale securities, net of tax				(99)		(99)
Net income attributable to the noncontrolling interest					136	136
Net income attributable to Northrim BanCorp			4,040			4,040
Total Comprehensive Income						4,077
Ending balance, value at Jun. 30, 2010	6,387	52,484	53,868	1,242	43	114,024
Ending balance, shares at Jun. 30, 2010	6,387,000					6,386,925
Beginning balance, value at Dec. 31, 2010	6,427	52,658	57,339	648	50	117,122
Beginning balance, shares at Dec. 31, 2010	6,427,000					6,427,237
Cash dividend declared			(1,564)			(1,564)
Stock option expense		263				263
Exercise of stock options, shares	6,000
Exercise of stock options	6	(6)
Excess tax benefits from share-based payment arrangements		38				38
Distributions to noncontrolling interest					(230)	(230)
Comprehensive income:
Change in unrealized holding gain (loss) on available for sale securities, net of tax				521		521
Net income attributable to the noncontrolling interest					222	222
Net income attributable to Northrim BanCorp			5,637			5,637
Total Comprehensive Income						6,380
Ending balance, value at Jun. 30, 2011	$ 6,433	$ 52,953	$ 61,412	$ 1,169	$ 42	$ 122,009
Ending balance, shares at Jun. 30, 2011	6,433,000					6,433,438