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Business Combination - Tennessee Bancshares Merger (Q2) (Details) - USD ($)
May 01, 2018
Nov. 01, 2017
Aug. 31, 2015
Business Acquisition [Line Items]      
Cash consideration paid   $ 15,826,000  
Total consideration   85,722,000  
Fair value of assets acquired and liabilities assumed:      
Cash and cash equivalents   16,810,000  
Investment securities available for sale   51,638,000  
Restricted investments   1,049,000  
Loans   413,023,000  
Premises and equipment   8,668,000  
Core deposit intangible   5,530,000  
Other real estate owned   410,000  
Prepaid and other assets   6,360,000  
Deposits   (454,154,000)  
Payables and other liabilities   (6,803,000)  
Total fair value of net assets acquired   47,675,000  
Goodwill   $ 38,047,000 $ 42,873,689
Tennessee Bancshares [Member]      
Business Acquisition [Line Items]      
Shares of SMBK common stock issued to TN Bancshares shareholders as of May 1, 2018 (in shares) 1,458,981    
Market price of SMBK common stock on May 1, 2018 (in dollars per share) $ 23.85    
Estimated fair value of SMBK common stock issued (in shares) $ 34,797,000    
Cash consideration paid 5,000    
Total consideration 34,802,000    
Fair value of assets acquired and liabilities assumed:      
Cash and cash equivalents 5,723,000    
Investment securities available for sale 24,563,000    
Restricted investments 464,000    
Loans 180,490,000    
Premises and equipment 9,470,000    
Core deposit intangible 2,290,000    
Other real estate owned 674,000    
Prepaid and other assets 2,258,000    
Deposits (202,272,000)    
FHLB advances and other borrowings (4,000,000)    
Payables and other liabilities (586,000)    
Total fair value of net assets acquired 19,074,000    
Goodwill $ 15,728,000