Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator for both basic and diluted earnings per share:                      
Net income (loss) attributable to Hallmark Financial Services, Inc.                 $ 21,863 $ 13,429 $ 8,245
Denominator, basic shares                 19,211 19,197 19,263
Effect of dilutive securities:                      
Stock-based compensation awards                 194 169 98
Denominator, diluted shares                 19,405 19,366 19,361
Basic earnings per share: (in dollars per share) $ 0.18 $ 0.35 $ 0.33 $ 0.28 $ 0.20 $ 0.18 $ 0.09 $ 0.24 $ 1.14 $ 0.70 $ 0.43
Diluted earnings per share: (in dollars per share) $ 0.17 $ 0.35 $ 0.33 $ 0.28 $ 0.19 $ 0.18 $ 0.09 $ 0.23 $ 1.13 $ 0.69 $ 0.43