Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 3,741	$ 4,506	$ 7,663	$ 8,012
Securities available for sale:
Unrealized gains arising during the period	90	466	687	1,792
Reclassification of net (gains) losses included in net income (net of tax (benefit) expense) of $0 and $5 for the second quarter of 2017 and 2016, respectively and $6 and ($5) for the six months ended June 30, 2017 and 2016, respectively	0	(7)	(8)	6
Income tax benefit related to unrealized gains and losses	(31)	(174)	(254)	(644)
Other comprehensive income, net of tax	59	285	425	1,154
Comprehensive income	3,800	4,791	8,088	9,166
Less: comprehensive income attributable to the noncontrolling interest	152	156	249	286
Comprehensive income attributable to Northrim BanCorp, Inc.	$ 3,648	$ 4,635	$ 7,839	$ 8,880