Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Non-controlling Interest
Beginning balance (in shares) at Dec. 31, 2012		6,512,000
Beginning balance, value at Dec. 31, 2012	$ 136,353	$ 6,512	$ 53,638	$ 74,742	$ 1,368	$ 93
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend declared	(4,212)			(4,212)
Stock-based compensation expense	506		506
Exercise of stock options (in 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)
Other comprehensive income (loss), net of tax	(699)				(699)
Net income attributable to the noncontrolling interest	87					87
Net income attributable to Northrim Bancorp, Inc.	12,325			12,325
Ending balance, value at Dec. 31, 2013	144,318	$ 6,538	54,089	82,855	669	167
Ending balance (in shares) at Dec. 31, 2013		6,538,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend declared	(4,770)			(4,770)
Stock-based compensation expense	360		360
Exercise of stock options (in 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)
Other comprehensive income (loss), net of tax	(422)				(422)
Net income attributable to the noncontrolling interest	459					459
Net income attributable to Northrim Bancorp, Inc.	17,408			17,408
Purchase of Alaska Pacific (in shares)		290,000
Purchase of Alaska Pacific	7,446	$ 290	7,156
Ending balance, value at Dec. 31, 2014	$ 164,441	$ 6,854	61,729	95,493	247	118
Ending balance (in shares) at Dec. 31, 2014	6,854,189	6,854,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend declared	$ (5,126)			(5,126)
Stock-based compensation expense	608		608
Exercise of stock options (in shares)		23,000
Exercise of stock options	50	$ 23	27
Excess tax benefits from share-based payment arrangements	56		56
Distributions to noncontrolling interest	(490)					(490)
Other comprehensive income (loss), net of tax	(659)				(659)
Net income attributable to the noncontrolling interest	551					551
Net income attributable to Northrim Bancorp, Inc.	17,783			17,783
Ending balance, value at Dec. 31, 2015	$ 177,214	$ 6,877	$ 62,420	$ 108,150	$ (412)	$ 179
Ending balance (in shares) at Dec. 31, 2015	6,877,140	6,877,000