Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Interest Income
Interest and fees on loans	$ 42,391	$ 44,926	$ 48,830
Interest on investment securities-available for sale	3,097	4,316	4,134
Interest on investment securities-held to maturity	212	278	365
Interest on deposits in other banks	208	178	161
Total Interest Income	45,908	49,698	53,490
Interest Expense
Interest expense on deposits, borrowings and junior subordinated debentures	3,544	5,485	7,069
Net Interest Income	42,364	44,213	46,421
Provision for loan losses	1,999	5,583	7,066
Net Interest Income After Provision for Loan Losses	40,365	38,630	39,355
Other Operating Income
Purchased receivable income	2,703	1,839	2,106
Service charges on deposit accounts	2,296	2,636	2,983
Employee benefit plan income	2,167	1,900	1,739
Electronic banking income	1,945	1,758	1,542
Rental income	776	810	850
Gain on sale of securities	419	649	220
Other income	1,583	1,384	1,295
Total Other Operating Income	13,090	12,377	13,084
Other Operating Expense
Salaries and other personnel expense	21,006	21,637	22,174
Occupancy	3,764	3,704	3,687
Marketing expense	1,771	1,782	1,317
Professional and outside services	1,386	1,315	1,798
Insurance expense	1,333	1,902	2,715
Equipment expense	1,200	1,116	1,218
Software expense	1,005	920	979
Amortization of low income housing tax investments	902	869	790
Internet banking expense	648	622	558
Intangible asset amortization expense	275	299	323
OREO expense, net rental income and gains on sale	(710)	(1,145)	1,119
Prepayment penalty on long term debt			718
Other expense	4,175	4,603	3,961
Total Other Operating Expense	36,755	37,624	41,357
Income Before Provision for Income Taxes	16,700	13,383	11,082
Provision for income taxes	4,873	3,918	2,967
Net Income	11,827	9,465	8,115
Less: Net income attributable to the noncontrolling interest	429	399	388
Net income attributable to Northrim Bancorp	11,398	9,066	7,727
Earnings Per Share, Basic	$ 1.77	$ 1.42	$ 1.22
Earnings Per Share, Diluted	$ 1.74	$ 1.40	$ 1.20
Weighted Average Shares Outstanding, Basic	6,438,625	6,398,329	6,345,948
Weighted Average Shares Outstanding, Diluted	6,554,761	6,480,905	6,417,057
RML [Member]
Other Operating Income
Equity in earnings from RML	$ 1,201	$ 1,401	$ 2,349