Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended						1 Months Ended	12 Months Ended		12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2006	Sep. 30, 2006	Jan. 31, 2003	Oct. 31, 2007 Alaska First [Member]	Dec. 31, 2012 Alaska First [Member]	Dec. 31, 2012 Bank Of America [Member]	Dec. 31, 2012 Northrim Benefits Group [Member]	Dec. 31, 2012 Vehicles [Member]	Dec. 31, 2012 Buildings [Member]	Dec. 31, 2011 Buildings [Member]	Dec. 31, 2012 Maximum [Member] Tenant Improvements [Member]	Dec. 31, 2011 Maximum [Member] Tenant Improvements [Member]	Dec. 31, 2012 Maximum [Member] Furniture And Equipment [Member]	Dec. 31, 2011 Maximum [Member] Furniture And Equipment [Member]	Dec. 31, 2012 Minimum [Member] Tenant Improvements [Member]	Dec. 31, 2011 Minimum [Member] Tenant Improvements [Member]	Dec. 31, 2012 Minimum [Member] Furniture And Equipment [Member]	Dec. 31, 2011 Minimum [Member] Furniture And Equipment [Member]
Activities percentage of total revenue and total assets	10.00%
Maturity period of securities at acquisition	90 days
Prior notice for redemption of FHLB Class B Stock	5 years
Threshold for nonperformation loans individually evaluated for impairment	$ 50,000
Premises and equipment, useful Life											5 years	39 years	39 years	15 years	15 years	7 years	7 years	2 years	2 years	3 years	3 years
Estimated useful life, years							10 years	10 years
Goodwill	7,525,000	7,525,000							6,900,000
CDI recorded							1,300,000		2,900,000
Intangible assets										1,100,000
Equity interest percentage										40.10%
Amortization period of intangible assets										10 years
Interest in partnerships	2,500,000			3,000,000	3,000,000	3,000,000
Advertising, promotion, and marketing costs	2,000,000	1,800,000	1,800,000
Incremental share resulting from stock options	20,691	24,782	19,289
Average incremental shares resulting from stock options	63,344	116,136	82,576
Percentage of unrestricted revenues funded through taxes and royalties	93.00%
Commercial and construction loans	327,100,000	292,900,000
Percentage of loan portfolio attributable to large borrowing relationships	43.00%
Large borrowing relationships	22
Unfunded commitments to large borrowers	$ 122,700,000