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Supplemental Disclosure for Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Earnings:                    
Net income attributable to First Capital, Inc. $ 1,249 $ 719 $ 1,035 $ 919 $ 1,042 $ 1,093 $ 941 $ 896 $ 3,922 $ 3,972
Shares:                    
Weighted average common shares outstanding                 2,785,286 2,786,410
Net income per common share attributable to First Capital, Inc., basic and diluted                 $ 1.41 $ 1.43