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Summary of Significant Accounting Policies - Calculation Of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Net income attributable to Northrim BanCorp, Inc.	$ 4,848	$ 5,264	$ 5,830	$ 4,062	$ 214	$ 5,523	$ 3,589	$ 3,825	$ 20,004	$ 13,151	$ 14,411
Basic weighted average common shares outstanding (in shares)									6,877,573	6,889,621	6,883,663
Dilutive effect of potential common shares from awards granted under equity incentive program (in shares)									104,000	88,000	91,000
Total (in shares)									6,981,557	6,977,910	6,974,864
Earnings per common share
Basic (in USD per share)	$ 0.70	$ 0.77	$ 0.85	$ 0.59	$ 0.03	$ 0.80	$ 0.52	$ 0.55	$ 2.91	$ 1.91	$ 2.09
Diluted (in USD per share)	$ 0.69	$ 0.75	$ 0.84	$ 0.58	$ 0.03	$ 0.79	$ 0.51	$ 0.55	$ 2.86	$ 1.88	$ 2.06

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