Parent Company Information - Statements Of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income	$ 12,325	$ 12,946	$ 11,398
Stock-based compensation	506	454	519
Net Cash Provided (Used) by Operating Activities	18,648	32,549	(5,025)
Investment in securities available for sale	(140,856)	(111,431)	(169,712)
Net Cash (Used) Provided by Investing Activities	(107,989)	(28,276)	216
Dividends paid to shareholders	(4,215)	(3,676)	(3,264)
Net Cash Provided by Financing Activities	33,619	57,510	18,306
Net Increase (Decrease) in Cash and Cash Equivalents	(55,722)	61,783	13,497
Cash and Cash Equivalents at Beginning of Year	141,313	79,530	66,033
Cash and Cash Equivalents at End of Year	85,591	141,313	79,530
Northrim Bancorp, Inc.
Net income	12,325	12,946	11,398
Equity in undistributed earnings from subsidiaries	(13,683)	(13,985)	(12,461)
Stock-based compensation	506	454	519
Changes in other assets and liabilities	60	(79)	852
Net Cash Provided (Used) by Operating Activities	(912)	(506)	(1,396)
Investment in securities available for sale	525	(2,527)	(999)
Investment in Northrim Bank, NISC, NCT1 & NST2	5,874	7,921	7,040
Net Cash (Used) Provided by Investing Activities	6,399	5,394	6,041
Dividends paid to shareholders	(4,215)	(3,676)	(3,264)
Proceeds from issuance of common stock and excess tax benefits	100	233	171
Net Cash Provided by Financing Activities	(4,115)	(3,443)	(3,093)
Net Increase (Decrease) in Cash and Cash Equivalents	1,372	1,445	1,552
Cash and Cash Equivalents at Beginning of Year	8,749	7,304	5,752
Cash and Cash Equivalents at End of Year	$ 10,121	$ 8,749	$ 7,304