Schedule II. Condensed Financial Statements of Parent Company (Condensed Statement of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income (loss)	$ 80,594	$ (112,706)	$ 14,820
Adjustments to reconcile net income to net cash provided by operating activities
Other, net	(7,637)	9,602	(1,274)
Cash from operating activities	(50,677)	154,141	78,932
Net cash provided by operating activities	29,917	41,435	93,752
Cash flows from investing activities
Net cash provided by (used in) investing activities	31,731	(92,871)	4,501
Cash flows from financing activities
Repurchase of common stock	(2,007)	(2,741)	(11,700)
Issuance of common stock	(421)	(71)	2,377
Net cash provided by (used in) financing activities	(17,492)	18,662	(41,985)
Net Change in Cash and Cash Equivalents	44,156	(32,774)	56,268
Cash and Cash Equivalents at Beginning of Year	87,948	120,722	64,454
Cash and Cash Equivalents at End of Year	132,104	87,948	120,722
United Fire Group, Inc.
Cash flows from operating activities
Net income (loss)	80,594	(112,706)	14,820
Adjustments to reconcile net income to net cash provided by operating activities
Equity in net income of subsidiary	(80,579)	112,769	(14,655)
Dividends received from subsidiary	10,000	4,000	57,000
Other, net	3,131	3,907	5,512
Cash from operating activities	(67,448)	120,676	47,857
Net cash provided by operating activities	13,146	7,970	62,677
Cash flows from investing activities
Net cash provided by (used in) investing activities	0	0	0
Cash flows from financing activities
Payment of cash dividends	(15,064)	(28,532)	(32,662)
Repurchase of common stock	(2,007)	(2,741)	(11,700)
Issuance of common stock	(421)	(71)	2,377
Net cash provided by (used in) financing activities	(17,492)	(31,344)	(41,985)
Net Change in Cash and Cash Equivalents	(4,346)	(23,374)	20,692
Cash and Cash Equivalents at Beginning of Year	6,504	29,878	9,186
Cash and Cash Equivalents at End of Year	$ 2,158	$ 6,504	$ 29,878