Summary Of Significant Accounting Policies - Narrative (Details) (USD $) Share data in Thousands, unless otherwise specified	12 Months Ended					1 Months Ended	12 Months Ended				12 Months Ended
	Dec. 31, 2013 borrower	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 USA 57	Dec. 31, 2013 Centerline XXXIII	Oct. 31, 2007 Alaska First	Dec. 31, 2013 Alaska First	Dec. 31, 2013 Northrim Benefits Group	Dec. 31, 2013 Centerline XXII	Dec. 31, 2013 WNC	Dec. 31, 2013 Buildings	Dec. 31, 2012 Buildings	Dec. 31, 2013 Maximum Tenant Improvements	Dec. 31, 2012 Maximum Tenant Improvements	Dec. 31, 2013 Maximum Furniture And Equipment	Dec. 31, 2012 Maximum Furniture And Equipment	Dec. 31, 2013 Minimum Tenant Improvements	Dec. 31, 2012 Minimum Tenant Improvements	Dec. 31, 2013 Minimum Furniture And Equipment	Dec. 31, 2012 Minimum Furniture And Equipment	Dec. 31, 2013 Core Deposits Alaska First	Dec. 31, 2012 Core Deposits Alaska First	Dec. 31, 2011 Core Deposits Alaska First	Dec. 31, 2013 Customer Relationships Northrim Benefits Group	Dec. 31, 2012 Customer Relationships Northrim Benefits Group	Dec. 31, 2011 Customer Relationships Northrim Benefits Group
Ownership Percentage in VIE								50.10%
Marketing expense	$ 1,853,000	$ 1,975,000	$ 1,771,000
Activities percentage of total revenue and total assets	10.00%
Maturity period of securities at acquisition	90 days
Threshold for nonperformation loans individually evaluated for impairment	50,000
Premises and equipment, useful Life											39 years	39 years	15 years	15 years	7 years	7 years	2 years	2 years	3 years	3 years
Goodwill	7,525,000	7,525,000				1,800,000
CDI recorded						1,300,000
Estimated useful life, years						10 years	10 years
Accumulated amortization for intangible assets	6,200,000	5,900,000																			1,100,000	983,000	846,000	943,000	829,000	714,000
Intangible assets								1,100,000
Equity interest percentage								40.10%
Incremental share resulting from stock options	91	98	116
Commercial and construction loans	363,100,000	327,100,000
Percentage of loan portfolio attributable to large borrowing relationships	44.00%
Large borrowing relationships	22
Unfunded commitments to large borrowers	128,900,000
Amortization period of intangible assets								10 years
Prior notice for redemption of FHLB Class B Stock	5 years
Commitments to invest	$ 22,175,000			$ 3,000,000	$ 3,000,000				$ 3,000,000	$ 2,500,000