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Statutory Reporting, Capital Requirements and Dividends and Retained Earnings Restrictions - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 15, 2020
Statutory Accounting Practices [Line Items]        
Payment of cash dividends $ 16,164,000 $ 15,860,000 $ 15,064,000  
United Fire & Casualty Company        
Statutory Accounting Practices [Line Items]        
Intercompany dividend payments that are eliminated in Consolidated Financial Statements 13,200,000 12,000,000 10,000,000  
Subsidiaries        
Statutory Accounting Practices [Line Items]        
Intercompany dividend payments that are eliminated in Consolidated Financial Statements 0 $ 0 $ 0  
State of Iowa Insurance Department        
Statutory Accounting Practices [Line Items]        
Statutory amount available for dividend payments $ 58,600,000      
Surplus Notes        
Statutory Accounting Practices [Line Items]        
Principal amount       $ 50,000,000