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Business Combinations (Allocation of Purchase Price of Tennessee Bancshares) (Details) - USD ($)
$ / shares in Units, $ in Thousands
May 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Fair value of assets acquired and liabilities assumed:      
Goodwill   $ 65,600 $ 66,100
Tennessee Bancshares [Member]      
Business Acquisition [Line Items]      
Shares of SMBK common stock issued (in shares) 1,458,981    
Market price of SMBK common stock (in dollars per share) $ 23.85    
Estimated fair value of SMBK common stock issued $ 34,797    
Cash consideration paid 5    
Total consideration 34,802    
Fair value of assets acquired and liabilities assumed:      
Cash and cash equivalents 5,723    
Investment securities available-for-sale 24,563    
Restricted investments 464    
Loans 180,490    
Premises and equipment 9,470    
Core deposit intangible 2,290    
Other real estate owned 674    
Prepaid and other assets 2,207    
Deposits (202,272)    
FHLB advances and other borrowings (4,000)    
Payables and other liabilities (586)    
Total fair value of net assets acquired 19,023    
Goodwill $ 15,779