EMPLOYEE BENEFITS (Profit-Sharing Plan and ESOP) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
ESOP, Minimum requisite service period	1 year
ESOP, minimum participant age	21 years
Number of United Fire Group, Inc. common stock shares owned in the ESOP	214,637	220,468
Employer contributions to ESOP	$ 250,000	$ 0	$ 100,000
Profit-Sharing Plan [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Employer contribution to the profit-sharing plan	$ 3,847,000	$ 6,029,000	$ 1,812,000