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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On December 12, 2017, the Company along with the Bank entered into an agreement and plan of merger with Tennessee Bancshares, Inc., a Tennessee corporation and Southern Community Bank, a Tennessee-chartered commercial bank and wholly owned subsidiary of Tennessee Bancshares. The merger was consummated on May 1, 2018 with SmartFinancial acquiring one hundred percent of Tennessee Bancshares common stock, each of which were converted into 0.8065 shares of SmartFinancial common stock.