Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Income
Interest and fees on loans and loans held for sale	$ 54,777	$ 56,166	$ 51,015
Interest on investment securities available for sale	3,895	3,393	3,042
Interest on investment securities held to maturity	41	68	91
Interest on deposits in other banks	205	153	198
Total Interest Income	58,918	59,780	54,346
Interest Expense
Interest expense on deposits	1,870	1,939	1,419
Interest expense on securities sold under agreements to repurchase	30	23	16
Interest expense on borrowings	127	446	167
Interest expense on junior subordinated debentures	534	463	451
Total Interest Expense	2,561	2,871	2,053
Net Interest Income	56,357	56,909	52,293
Provision (benefit) for loan losses	2,298	1,754	(636)
Net Interest Income After Provision (Benefit) for Loan Losses	54,059	55,155	52,929
Other Operating Income
Mortgage banking income	29,507	29,613	2,386
Employee benefit plan income	3,770	3,651	3,497
Bankcard fees	2,670	2,671	2,229
Purchased receivable income	2,347	2,287	2,074
Service charges on deposit accounts	1,998	2,103	2,155
Gain (loss) on sale of securities	(11)	271	461
Gain on purchase of mortgage affiliate	0	0	3,001
Equity in earnings from RML	0	0	894
Other income	2,982	4,012	3,337
Total Other Operating Income	43,263	44,608	20,034
Other Operating Expense
Salaries and other personnel expense	46,752	43,931	27,758
Occupancy expense	6,462	6,332	4,360
Compensation expense - RML acquisition payments	4,775	4,094	0
Data processing expense	4,566	4,313	4,171
Professional and outside services	3,110	2,980	1,437
Marketing expense	2,449	2,728	2,059
Insurance expense	1,023	1,339	1,031
Loss (gain) on sale of premises and equipment	352	37	(1,109)
Intangible asset amortization expense	135	258	289
OREO (income) expense, net rental income and gains on sale	98	190	(416)
Merger and acquisition expense	0	0	1,962
Reserve (benefit) for purchased receivables	(10)	(138)	704
Other operating expense	6,568	6,581	4,677
Total Other Operating Expense	76,280	72,645	46,923
Income Before Provision for Income Taxes	21,042	27,118	26,040
Provision for income taxes	6,052	8,784	8,173
Net Income	14,990	18,334	17,867
Less: Net income attributable to the noncontrolling interest	579	551	459
Net Income Attributable to Northrim BanCorp, Inc.	$ 14,411	$ 17,783	$ 17,408
Earnings Per Share, Basic (in USD per share)	$ 2.09	$ 2.59	$ 2.57
Earnings Per Share, Diluted (in USD per share)	$ 2.06	$ 2.56	$ 2.54
Weighted Average Shares Outstanding, Basic (in shares)	6,883,663	6,859,209	6,761,328
Weighted Average Shares Outstanding, Diluted (in shares)	6,974,864	6,948,474	6,852,267