Insider Trading Arrangements	12 Months Ended
Dec. 31, 2025
Trading Arrangements, by Individual [Table]
Material Terms of Trading Arrangement [Text Block]	*Item 9B.* Other Information Amendment to the Bylaws.** On March 10, 2026, the Board of Directors of the Company approved amendments to the Company’s Bylaws. The amendments updated provisions relating to shareholder meetings, including with respect to remote meetings, confirming that nominations for the election of directors and the proposal of other business must comply with the procedures set forth in the Company's Amended and Restated Articles of Incorporation and that nominations must also comply with Rule 14a-19 under the Exchange Act and providing for one or more election inspectors, removed the mandatory retirement provision for directors, removed certain provisions otherwise addressed by applicable law or practice in order to make the Bylaws less prescriptive, and made other non-substantive conforming and administrative changes. The Company’s Corporate Governance Policy now addresses matters relating to director retirement age. The amendments became effective on approval. The amendments did not alter the rights of security holders in any material respect. The foregoing summary is qualified in its entirety by reference to the full text of the amended Bylaws, a copy of which is filed as Exhibit 3.2 to this Form 10‑K and is incorporated herein by reference. *Rule 10b5-1 Trading Plans.* During the fiscal quarter ended December 31, 2025, no director or officer of First Northwest adopted or terminated a "Rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408(a) of Regulation S-K.
Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false

Insider Trading Arrangements

12 Months Ended

Dec. 31, 2025

Trading Arrangements, by Individual [Table]

Material Terms of Trading Arrangement [Text Block]

Item 9B. Other Information

Amendment to the Bylaws. On March 10, 2026, the Board of Directors of the Company approved amendments to the Company’s Bylaws. The amendments updated provisions relating to shareholder meetings, including with respect to remote meetings, confirming that nominations for the election of directors and the proposal of other business must comply with the procedures set forth in the Company's Amended and Restated Articles of Incorporation and that nominations must also comply with Rule 14a-19 under the Exchange Act and providing for one or more election inspectors, removed the mandatory retirement provision for directors, removed certain provisions otherwise addressed by applicable law or practice in order to make the Bylaws less prescriptive, and made other non-substantive conforming and administrative changes. The Company’s Corporate Governance Policy now addresses matters relating to director retirement age. The amendments became effective on approval. The amendments did not alter the rights of security holders in any material respect. The foregoing summary is qualified in its entirety by reference to the full text of the amended Bylaws, a copy of which is filed as Exhibit 3.2 to this Form 10‑K and is incorporated herein by reference.

Rule 10b5-1 Trading Plans. During the fiscal quarter ended December 31, 2025, no director or officer of First Northwest adopted or terminated a "Rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408(a) of Regulation S-K.

Rule 10b5-1 Arrangement Adopted [Flag]

false

Non-Rule 10b5-1 Arrangement Adopted [Flag]

false

Rule 10b5-1 Arrangement Terminated [Flag]

false

Non-Rule 10b5-1 Arrangement Terminated [Flag]

false