Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Income
Interest and fees on loans	$ 51,627	$ 43,137	$ 41,515
Interest on investment securities available for sale	3,042	2,603	2,796
Interest on investment securities held to maturity	91	111	139
Interest on deposits in other banks	198	223	278
Total Interest Income	54,958	46,074	44,728
Interest Expense
Interest expense on deposits, borrowings and junior subordinated debentures	2,053	2,040	2,505
Net Interest Income	52,905	44,034	42,223
Provision (benefit) for loan losses	(636)	(635)	(1,559)
Net Interest Income After Provision (Benefit) for Loan Losses	53,541	44,669	43,782
Other Operating Income
Employee benefit plan income	3,497	2,341	2,369
Gain on purchase of mortgage affiliate	3,001	0	0
Electronic banking income	2,356	2,151	2,058
Service charges on deposit accounts	2,155	2,116	2,201
Purchased receivable income	2,074	2,797	3,026
Mortgage banking income	1,620	0	0
Gain on sale of premises and equipment	1,115	0	0
Equity in earnings from RML	894	1,227	2,635
Gain on sale of securities	461	333	336
Rental income	260	108	773
Other income	3,104	1,813	2,034
Total Other Operating Income	20,537	12,886	15,432
Other Operating Expense
Salaries and other personnel expense	27,758	23,796	22,032
Occupancy expense	4,360	3,464	3,615
Marketing expense	2,059	1,853	1,975
Merger and acquisition expense	1,962	536	0
Equipment expense	1,465	1,239	1,205
Professional and outside services	1,437	1,268	1,479
Amortization of low income housing tax investments	1,337	969	921
Software expense	1,275	1,066	1,111
Insurance expense	1,031	821	913
Internet banking expense	900	778	701
Reserve for purchased receivables	704	100	357
Intangible asset amortization expense	289	228	252
OREO (income) expense, net rental income and gains on sale	(416)	(60)	1,089
Other operating expense	5,214	3,808	3,950
Total Other Operating Expense	49,375	39,866	39,600
Income Before Provision for Income Taxes	24,703	17,689	19,614
Provision for income taxes	6,836	5,277	6,156
Net Income	17,867	12,412	13,458
Less: Net income attributable to the noncontrolling interest	459	87	512
Net Income Attributable to Northrim BanCorp	$ 17,408	$ 12,325	$ 12,946
Earnings per share, basic (USD per share)	$ 2.57	$ 1.89	$ 2.00
Earnings per share, diluted (USD per share)	$ 2.54	$ 1.87	$ 1.97
Weighted Average Shares Outstanding, Basic (shares)	6,761,328	6,518,772	6,477,266
Weighted Average Shares Outstanding, Diluted (shares)	6,852,267	6,609,950	6,574,993