Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 5,601	$ 3,283	$ 13,264	$ 11,295
Securities available for sale:
Unrealized gains (losses) arising during the period	197	(148)	884	1,644
Reclassification of net (gains) losses included in net income (net of tax (benefit) expense) of ($1) and $0 for the third quarter of 2017 and 2016, respectively and $5 and ($5) for the nine months ended September 30, 2017 and 2016, respectively	2	0	(6)	6
Derivatives and hedging activities:
Unrealized gains arising during the period	127	0	127	0
Income tax (expense) benefit related to unrealized gains and losses	(80)	43	(334)	(601)
Other comprehensive income (loss), net of tax	246	(105)	671	1,049
Comprehensive income	5,847	3,178	13,935	12,344
Less: comprehensive income attributable to the noncontrolling interest	78	188	327	474
Comprehensive income attributable to Northrim BanCorp, Inc.	$ 5,769	$ 2,990	$ 13,608	$ 11,870