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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Intangible Assets And Goodwill [Line Items]      
Impairment of goodwill $ 578,000 $ 1,123,000  
Goodwill 4,820,000 5,398,000 $ 6,521,000
Amortization of definite lived intangible assets $ 400,000 500,000 500,000
Weighted average amortization period for definite lived intangible assets 13 years 7 months 6 days    
Net Value $ 14,000,000.0 19,000,000.0  
Definite lived intangible assets 800,000 1,300,000  
Accumulated impairment losses 600,000 1,100,000 0
State insurance licenses      
Intangible Assets And Goodwill [Line Items]      
Net Value 5,000,000 10,000,000  
Impairment of indefinite lived intangible assets 5,000,000    
Other Than Agent Relationships      
Intangible Assets And Goodwill [Line Items]      
Impairment of definite lived intangible assets 0 0 0
Commercial Specialty      
Intangible Assets And Goodwill [Line Items]      
Impairment of goodwill 0 0 0
Goodwill 4,820,000 4,820,000 4,820,000
Farm, Ranch & Stable Business and Specialty Property Business [Member]      
Intangible Assets And Goodwill [Line Items]      
Goodwill 1,700,000    
Farm, Ranch & Stable      
Intangible Assets And Goodwill [Line Items]      
Goodwill $ 600,000    
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Cost and Expense, Operating    
Impairment of definite lived intangible assets $ 100,000    
Manufactured and Dwelling Homes Business      
Intangible Assets And Goodwill [Line Items]      
Impairment of definite lived intangible assets 200,000    
Exited Lines Segment      
Intangible Assets And Goodwill [Line Items]      
Impairment of goodwill 578,000 1,123,000  
Goodwill $ 0 578,000 $ 1,701,000
Impairment of Intangible Asset Statement of Income or Comprehensive Income Extensible Enumeration Other Cost and Expense, Operating    
Impairment of definite lived intangible assets $ 100,000 200,000  
Exited Lines Segment | State insurance licenses      
Intangible Assets And Goodwill [Line Items]      
Net Value 5,000,000.0    
Impairment of indefinite lived intangible assets 5,000,000.0    
Exited Lines Segment | Corporate and Other Operating Expenses      
Intangible Assets And Goodwill [Line Items]      
Impairment of goodwill 600,000 $ 1,100,000  
Specialty Property Business      
Intangible Assets And Goodwill [Line Items]      
Goodwill $ 1,100,000