Schedule II. Condensed Financial Statements of Parent Company (Condensed Balance Sheet) (Phantom) (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]
Held-to-maturity fixed maturities	$ 675	$ 404
Common stock, par value per share (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	25,151,428	25,019,415
Common stock, shares outstanding	25,151,428	25,019,415
United Fire Group, Inc. [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Held-to-maturity fixed maturities	$ 150	$ 200
Common stock, par value per share (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	25,151,428	25,019,415
Common stock, shares outstanding	25,151,428	25,019,415