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Small Business Lending Fund	12 Months Ended
Small Business Lending Fund	Dec. 31, 2017
Small Business Lending Fund [Abstract]
Small Business Lending Fund	Small Business Lending Fund In connection with the Company's merger with Legacy SmartFinancial, Inc. in 2015, the Company assumed Legacy SmartFinancial's obligations under a stock purchase agreement with the U.S. Department of the Treasury and issued 12,000 shares of preferred stock at $1,000 per share under the Small Business Lending Fund Program (the "SBLF Program").The Company paid cash dividends at a one percent rate or $120,000 for the year ended December 31, 2015 on the preferred shares. On February 4, 2016 the dividend rate for the preferred shares increased to nine percent and as a result the Company incurred preferred stock dividends of $1,022,000 for the year ended December 31, 2016 . On January 30, 2017, the Company completed a public offering of 2,010,084 million shares of its common stock, par value $1.00 per share, with the gross proceeds to the Company of approximately $33.2 million. On March 6, 2017, the Company used proceeds from the offering to redeem the $12 million of preferred stock and pay the $195 thousand accrued dividend.