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FIRST FINANCIAL NORTHWEST, INC. AND SUBSIDIARIES CONSOLIDATED STATEMETNS OF STOCKHOLDERS' EQUITY (PARENTHETICALS) - $ / shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]    
Common Stock, Dividends, Per Share, Cash Paid $ 0.23 $ 0.20
Allocated shares 84,640 84,642