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Junior Subordinated Debentures (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2005
Subordinated Borrowing [Line Items] |  |  |  |
Investment in unconsolidated trust | $ 54,361 | $ 68,488 |  |
Junior subordinated debentures | 10,310 | 10,310 |  |
Interest expense on deposits, borrowings and junior subordinated debentures | $ 3,779 | 6,051 | $ 5,641 |
Northrim Statutory Trust 2 |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |
Investment in unconsolidated trust |  |  |  | $ 10,000
Junior subordinated debentures |  |  |  | $ 10,300
LIBOR period | 90 days |  |  |
Basis plus LIBOR | 1.37% |  |  |
Liquidation preference per capital security (in USD per share) | $ 1,000 |  |  |
Interest rate | 1.57% |  |  |
Interest expense on deposits, borrowings and junior subordinated debentures | $ 160 | $ 219 | $ 398 |

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