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Junior Subordinated Debentures (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2005 | May 31, 2003
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated trust | $ 56,504,000 |  |  |  | $ 56,141,000 |  |  |  | $ 56,504,000 | $ 56,141,000 |  |  |
Junior subordinated debentures | 10,310,000 |  |  |  | 10,310,000 |  |  |  | 10,310,000 | 10,310,000 |  |  |
Interest expense on deposits, borrowings and junior subordinated debentures | 1,070,000 | $ 761,000 | $ 606,000 | $ 532,000 | $ 548,000 | $ 602,000 | $ 648,000 | $ 632,000 | 2,969,000 | 2,430,000 | $ 2,561,000 |  |
Northrim Capital Trust 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated trust |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000
Junior subordinated debentures | $ 8,200,000 |  |  |  |  |  |  |  | $ 8,200,000 |  |  |  |
LIBOR period |  |  |  |  |  |  |  |  | 90 days |  |  |  |
Basis plus LIBOR |  |  |  |  |  |  |  |  | 3.15% |  |  |  |
Liquidation preference per capital security (in USD per share) | $ 1,000 |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Interest expense on deposits, borrowings and junior subordinated debentures |  |  |  |  |  |  |  |  | $ 0 | 219,000 | 319,000 |  |
Northrim Statutory Trust 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated trust |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |
Junior subordinated debentures | $ 10,300,000 |  |  |  |  |  |  |  | $ 10,300,000 |  |  |  |
LIBOR period |  |  |  |  |  |  |  |  | 90 days |  |  |  |
Basis plus LIBOR |  |  |  |  |  |  |  |  | 1.37% |  |  |  |
Liquidation preference per capital security (in USD per share) | $ 1,000 |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Interest rate | 4.16% |  |  |  |  |  |  |  | 4.16% |  |  |  |
Interest expense on deposits, borrowings and junior subordinated debentures |  |  |  |  |  |  |  |  | $ 368,000 | $ 268,000 | $ 215,000 |  |

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