Parent Company Information - Statements Of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income
Interest income	$ 178,378	$ 153,919	$ 131,951
Gain on sale of marketable equity securities, net	0	112	0
Unrealized gain on marketable equity securities	169	465	120
Total Income	255,581	195,960	158,326
Expense
Interest expense	42,769	40,736	28,695
Income Before Provision for Income Taxes	84,519	46,994	31,608
Benefit from income taxes	19,911	10,023	6,214
Net income	64,608	36,971	25,394
Northrim Bancorp, Inc.
Income
Interest income	612	1,203	1,258
Gain on sale of marketable equity securities, net	0	112	0
Unrealized gain on marketable equity securities	169	465	120
Total Income	68,889	39,197	28,227
Expense
Interest expense	805	403	400
Administrative and other expenses	5,110	3,381	3,357
Total Expense	5,915	3,784	3,757
Income Before Provision for Income Taxes	62,974	35,413	24,470
Benefit from income taxes	(1,634)	(1,558)	(924)
Net income	64,608	36,971	25,394
Northrim Bancorp, Inc. | Northrim Bank
Income
Equity in undistributed earnings from subsidiaries	57,497	37,334	26,871
Northrim Bancorp, Inc. | Northrim Investment Services Company
Income
Equity in undistributed earnings from subsidiaries	$ 10,611	$ 83	$ (22)