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Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations
12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]  
Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations
Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations
(In thousands)        
Affiliation with Registrant: United Fire & Casualty Company and consolidated property and casualty subsidiaries   Claims and Claim Adjustment Expenses Incurred Related to:Amortization of Deferred Policy Acquisition Costs 
Reserves for Unpaid Claims and Claim Adjustment Expenses  Net Realized Investment Gains (Losses) 
Deferred Policy Acquisition CostsNet Investment IncomePaid Claims and Claim Adjustment Expenses
Unearned PremiumsEarned PremiumsCurrent YearPrior YearsPremiums Written
2021$91,446 $1,514,265 $439,733 $962,823 $47,383 $55,778 $691,933 $(39,778)$203,432 $697,078 $941,348 
2020$87,094 $1,578,131 $464,845 $1,055,082 $(32,395)$39,670 $887,119 $(17,652)$210,252 $776,397 $1,011,350 
2019$94,292 $1,421,754 $505,162 $1,086,972 $53,779 $60,414 $835,507 $(5,335)$216,699 $732,343 $1,096,730