0001401564 2023-03-31 2023-03-31 false --12-31 0001401564 8-K 2023-03-31 First Financial Northwest, Inc. WA 001-33652 26-0610707 201 Wells Avenue South Renton WA 98057 425 255-4400 false false false false Common Stock, par value $0.01 per share FFNW NASDAQ false