Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income
Interest and fees on loans	$ 56,166	$ 51,015	$ 43,137
Interest on investment securities available for sale	3,393	3,042	2,603
Interest on investment securities held to maturity	68	91	111
Interest on deposits in other banks	153	198	223
Total Interest Income	59,780	54,346	46,074
Interest Expense
Interest expense on deposits, borrowings and junior subordinated debentures	2,871	2,053	2,040
Net Interest Income	56,909	52,293	44,034
Provision (benefit) for loan losses	1,754	(636)	(635)
Net Interest Income After Provision (Benefit) for Loan Losses	55,155	52,929	44,669
Other Operating Income
Mortgage banking income	29,613	2,386	0
Employee benefit plan income	3,651	3,497	2,341
Bankcard fees	2,671	2,229	2,009
Purchased receivable income	2,287	2,074	2,797
Service charges on deposit accounts	2,103	2,155	2,116
Gain on sale of securities	271	461	333
Gain on purchase of mortgage affiliate	0	3,001	0
Gain on sale of premises and equipment	0	1,115	0
Equity in earnings from RML	0	894	1,227
Other income	4,012	3,337	2,063
Total Other Operating Income	44,608	21,149	12,886
Other Operating Expense
Salaries and other personnel expense	43,931	27,758	23,796
Occupancy expense	6,332	4,360	3,464
Change in fair value of RML earn-out liability	4,094	0	0
Marketing expense	2,728	2,059	1,853
Equipment expense	1,687	1,465	1,239
Professional and outside services	2,980	1,437	1,268
Software expense	1,262	1,275	1,066
Insurance expense	1,339	1,031	821
Internet banking expense	909	900	778
Reserve (benefit) for purchased receivables	(138)	704	100
Intangible asset amortization expense	258	289	228
Merger and acquisition expense	0	1,962	536
OREO (income) expense, net rental income and gains on sale	190	(416)	(60)
Other operating expense	7,073	5,214	3,808
Total Other Operating Expense	72,645	48,038	38,897
Income Before Provision for Income Taxes	27,118	26,040	18,658
Provision for income taxes	8,784	8,173	6,246
Net Income	18,334	17,867	12,412
Less: Net income attributable to the noncontrolling interest	551	459	87
Net Income Attributable to Northrim BanCorp, Inc.	$ 17,783	$ 17,408	$ 12,325
Earnings Per Share, Basic (USD per share)	$ 2.59	$ 2.57	$ 1.89
Earnings Per Share, Diluted (USD per share)	$ 2.56	$ 2.54	$ 1.87
Weighted Average Shares Outstanding, Basic (shares)	6,859,209	6,761,328	6,518,772
Weighted Average Shares Outstanding, Diluted (shares)	6,948,474	6,852,267	6,609,950