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REGULATORY CAPITAL (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
item
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
REGULATORY CAPITAL        
Number of ratios calculated according to the regulations for determining assigned capital category 3      
Total capital (to risk-weighted assets)        
Actual, Amount $ 315,877 $ 302,181    
Required for Adequate Capital, Amount 150,959 145,150    
Actual, Ratio (as a percent) 16.70% 16.70%    
Required for Adequate Capital, Ratio (as a percent) 8.00% 8.00%    
Tier 1 capital (to risk-weighted assets)        
Actual, Amount 292,278 279,440    
Required for Adequate Capital, Amount 75,480 72,575    
Actual, Ratio (as a percent) 15.50% 15.40%    
Required for Adequate Capital, Ratio (as a percent) 4.00% 4.00%    
Tier 1 capital (to average assets)        
Actual, Amount 292,278 279,440    
Required for Adequate Capital, Amount 111,444 110,428    
Actual, Ratio (as a percent) 10.50% 10.10%    
Required for Adequate Capital, Ratio (as a percent) 4.00% 4.00%    
Cash 69,914 61,320 84,114 65,650
Parent Company
       
Tier 1 capital (to average assets)        
Cash 15,500      
MainSource Bank
       
Total capital (to risk-weighted assets)        
Actual, Amount 296,075 283,653    
Required for Adequate Capital, Amount 149,956 144,147    
To Be Well Capitalized, Amount 187,445 180,184    
Actual, Ratio (as a percent) 15.80% 15.70%    
Required for Adequate Capital, Ratio (as a percent) 8.00% 8.00%    
To Be Well Capitalized, Ratio (as a percent) 10.00% 10.00%    
Tier 1 capital (to risk-weighted assets)        
Actual, Amount 272,633 261,069    
Required for Adequate Capital, Amount 74,978 72,074    
To Be Well Capitalized, Amount 112,467 108,111    
Actual, Ratio (as a percent) 14.50% 14.50%    
Required for Adequate Capital, Ratio (as a percent) 4.00% 4.00%    
To Be Well Capitalized, Ratio (as a percent) 6.00% 6.00%    
Tier 1 capital (to average assets)        
Actual, Amount 272,633 261,069    
Required for Adequate Capital, Amount 110,107 109,090    
To Be Well Capitalized, Amount $ 137,634 $ 136,363    
Actual, Ratio (as a percent) 9.90% 9.60%    
Required for Adequate Capital, Ratio (as a percent) 4.00% 4.00%    
To Be Well Capitalized, Ratio 5.00% 5.00%