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Junior Subordinated Debentures (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 22, 2005
Jun. 26, 2003
Dec. 31, 2017
Dec. 31, 2016
Junior Subordinated Debentures (Textual)        
Junior subordinated debentures     $ 13,403,000 $ 13,403,000
Dodd-Frank Act prohibits, Description     Dodd-Frank Act prohibit institutions that had more than $15 billion in assets on December 31, 2009 from including trust preferred securities as Tier 1 capital beginning in 2013, with one-third phased out over the two years ending in 2015. Financial institutions with less than $15 billion in total assets, such as the Bank, may continue to include their trust preferred securities issued prior to May 19, 2010 in Tier 1 capital, but cannot include in Tier 1 capital trust preferred securities issued after such date.  
Greenville First Statutory Trust I [Member]        
Junior Subordinated Debentures (Textual)        
Amount of trust preferred securities issued at floating rate   $ 6,000,000    
Maturity date of trust preferred securities   Jun. 26, 2033    
Floating interest rate of trust preferred securities     4.77%  
Indexed period of LIBOR rate     3-month  
Proceeds from issuance trust preferred securities     $ 6,000,000  
Initial proceeds from capital investment in trust     186,000  
Junior subordinated debentures     $ 6,200,000  
Greenville First Statutory Trust II [Member]        
Junior Subordinated Debentures (Textual)        
Amount of trust preferred securities issued at floating rate $ 7,000,000      
Maturity date of trust preferred securities Dec. 22, 2035      
Floating interest rate of trust preferred securities     3.13%  
Indexed period of LIBOR rate     3-month  
Proceeds from issuance trust preferred securities     $ 7,000,000  
Initial proceeds from capital investment in trust     217,000  
Junior subordinated debentures     $ 7,200,000