SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narratives) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 01, 2012
Item Effected [Line Items]
Common stock, par value per share (in usd per share)	$ 0.001	$ 0.001
Percentage of the gains and profits from the Lloyds plan available to United Fire & Indemnity Company	100.00%
Securities on deposit as required by law	$ 1,643,369,000	$ 1,620,505,000
Other-than-temporary impairment charges	0	139,000	4,000
Payment for income taxes	9,626,000	13,628,000	11,920,000
Federal tax refund received	615,000	8,744,000	15,798,000
Interest payment	0	0	961,000
Increase (decrease) in DAC asset	(13,383,000)	3,407,000
Depreciation expense	6,122,000	4,391,000	5,440,000
Goodwill, impairment charge	0	0	0
Intangible assets, impairment charge	0	0	0
Unrecognized tax benefit	0	0	0
Minimum [Member]
Item Effected [Line Items]
Useful life of intangible assets	2 years
Maximum [Member]
Item Effected [Line Items]
Useful life of intangible assets	15 years
United Fire & Casualty Company [Member] | Febuary 2012 Reorganization [Member]
Item Effected [Line Items]
Common stock, par value per share (in usd per share)				$ 3.333333
United Fire Group, Inc. [Member]
Item Effected [Line Items]
Common stock, par value per share (in usd per share)	$ 0.001	$ 0.001
United Fire Group, Inc. [Member] | Febuary 2012 Reorganization [Member]
Item Effected [Line Items]
Common stock, par value per share (in usd per share)				$ 0.001
Property and Casualty Insurance [Member]
Item Effected [Line Items]
Number of states in which we are licensed as insurer	43
Amortization expense	$ 769,000	$ 1,212,000	$ 2,539,000
Life Insurance [Member]
Item Effected [Line Items]
Number of states in which we are licensed as insurer	37
Traditional life insurance, interest rate assumptions, lower range	4.50%
Traditional life insurance, interest rate assumptions, upper range	6.00%