Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 3,283	$ 5,532	$ 11,295	$ 14,107
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) arising during the period	(148)	217	1,644	953
Reclassification of net (gains) losses included in net income (net of tax (benefit) expense of $0 and $2 for the third quarter of 2016 and 2015, respectively and ($5) and $55 for the nine months ended September 30, 2016 and 2015, respectively)	0	(2)	6	(79)
Income tax (expense) benefit related to unrealized gains and losses	43	(74)	(601)	(337)
Other comprehensive income (loss), net of tax	(105)	141	1,049	537
Comprehensive income	3,178	5,673	12,344	14,644
Less: comprehensive income attributable to the noncontrolling interest	188	197	474	431
Comprehensive income attributable to Northrim BanCorp, Inc.	$ 2,990	$ 5,476	$ 11,870	$ 14,213