Schedule II. Condensed Financial Statements of Parent Company (Condensed Balance Sheet) (Phantom) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Condensed Balance Sheet Statements, Captions [Line Items]
Held-to-maturity fixed maturities	$ 404	$ 669
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	25,019,415	25,360,893
Common stock, shares outstanding	25,019,415	25,360,893
United Fire Group, Inc. [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Held-to-maturity fixed maturities	$ 200	$ 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	25,019,415	25,360,893
Common stock, shares outstanding	25,019,415	25,360,893