Schedule II. Condensed Financial Statements of Parent Company (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 132,104	$ 87,948
Other assets	81,061	37,196
Total assets	3,012,721	3,069,678
Liabilities and stockholders' equity
Liabilities	2,133,600	2,244,529
Stockholders' equity
Common stock, $0.001 par value, authorized 75,000,000 shares 25,082,104 and 25,055,479 issued and outstanding in 2021 and 2020, respectively	25	25
Additional paid-in capital	203,375	202,359
Retained earnings	621,384	555,854
Accumulated other comprehensive income, net of tax	54,337	66,911
Total stockholders' equity	879,121	825,149	$ 910,472	$ 888,375
Total liabilities and stockholders' equity	3,012,721	3,069,678
United Fire Group, Inc.
Assets
Available-for-sale, at fair value (amortized cost $150 in 2021 and $150 in 2020)	150	150
Investment in subsidiary	876,868	818,581
Cash and cash equivalents	2,158	6,504
Other assets	12	15
Total assets	879,188	825,250
Liabilities and stockholders' equity
Liabilities	67	101
Stockholders' equity
Common stock, $0.001 par value, authorized 75,000,000 shares 25,082,104 and 25,055,479 issued and outstanding in 2021 and 2020, respectively	25	25
Additional paid-in capital	203,375	202,359
Retained earnings	621,384	555,854
Accumulated other comprehensive income, net of tax	54,337	66,911
Total stockholders' equity	879,121	825,149
Total liabilities and stockholders' equity	$ 879,188	$ 825,250