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Subordinated Debt Securities (Details) (USD $)
 1 Months Ended 12 Months Ended
Apr. 29, 2004
Dec. 16, 2003
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Aug. 30, 2012
May 31, 2012
Jul. 31, 2011
Class of Stock [Line Items]                
Common securities to the Company     $ 195,000 $ 194,000        
Subordinated Debt Securities (Textual) [Abstract]                
Aggregate principal amount of subordinated debt securities 25,800,000 10,300,000            
Redemption of debt securities             12,900,000 10,300,000
Redemption of remaining debt securities           12,900,000    
Subordinated debt securities quarterly rate LIBOR plus 3.80% per annum LIBOR plus 4.10% per annum            
Debt securities interest rate 3.80% 4.10%   4.30% 4.40%      
Subordinated debt securities due     2034          
Amerisafe Capital Trust I [Member]
                
Class of Stock [Line Items]                
Preferred securities to investors   10,000,000            
Common securities to the Company   300,000            
Amerisafe Capital Trust II [Member]
                
Class of Stock [Line Items]                
Preferred securities to investors 25,000,000              
Common securities to the Company $ 800,000