Parent Company Information - Statements Of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income
Interest income	$ 100,328	$ 84,606	$ 76,716
Gain on sale of marketable equity securities, net	0	67	98
Unrealized (loss) gain on marketable equity securities	(1,119)	(101)	61
Other income	34,077	52,263	63,328
Expense
Interest expense	5,213	3,779	6,051
Income Before Provision for Income Taxes	38,494	47,993	42,447
Benefit from income taxes	7,753	10,476	9,559
Net income	30,741	37,517	32,888
Northrim Bancorp, Inc.
Income
Interest income	698	551	599
Gain on sale of marketable equity securities, net	0	67	98
Unrealized (loss) gain on marketable equity securities	(1,119)	(101)	61
Other income	0	151	10
Total Income	32,552	39,359	34,512
Expense
Interest expense	389	382	385
Administrative and other expenses	2,830	2,754	2,748
Total Expense	3,219	3,136	3,133
Income Before Provision for Income Taxes	29,333	36,223	31,379
Benefit from income taxes	(1,408)	(1,294)	(1,509)
Net income	30,741	37,517	32,888
Northrim Bancorp, Inc. | Northrim Bank
Income
Equity in undistributed earnings from subsidiaries	32,853	38,625	33,570
Northrim Bancorp, Inc. | Northrim Investment Services Company
Income
Equity in undistributed earnings from subsidiaries	$ 120	$ 66	$ 174