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Reinsurance - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended 36 Months Ended 48 Months Ended
Nov. 01, 2022
Jan. 01, 2022
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2019
Effects Of Reinsurance [Line Items]                      
Reinsurance recoverables on paid losses       $ 6,653,000 $ 1,347,000   $ 6,653,000 $ 1,347,000 $ 6,653,000    
Stated net reserves retained       82,888,000 98,741,000 $ 87,052,000 82,888,000 98,741,000 82,888,000   $ 84,667,000
Losses and loss adjustment expenses, net       81,440,000 69,861,000 56,228,000          
Reinsurance recoverables on unpaid losses       82,651,000 40,344,000 24,218,000 82,651,000 40,344,000 82,651,000   $ 22,579,000
Prior period       24,284,000 19,432,000 15,594,000          
Prepaid reinsurance premiums       16,399,000 8,301,000   16,399,000 8,301,000 16,399,000    
Assumed premiums written       42,187,000 34,294,000 28,905,000          
Ceded premium written       46,787,000 30,666,000 18,395,000          
Ceded premiums earned       38,690,000 24,248,000 17,511,000          
Winter Storm Uri                      
Effects Of Reinsurance [Line Items]                      
Losses and loss adjustment expenses, net     $ 2,000,000.0                
Ceded premium written         340,000            
Ceded premiums earned         340,000            
Hurricane                      
Effects Of Reinsurance [Line Items]                      
Ceded premium written       1,600,000 86,000 195,000          
Ceded premiums earned       1,600,000 86,000 195,000          
Accident Year 2019                      
Effects Of Reinsurance [Line Items]                      
Prior period       9,600,000              
Loss Portfolio Transfer (“LPT”) Reinsurance Agreement                      
Effects Of Reinsurance [Line Items]                      
Reinsurance recoverables on paid losses       3,800,000     3,800,000   3,800,000    
Reinsurance recoverables on unpaid losses       25,900,000     25,900,000   25,900,000    
100% Cede of Commercial Liability Risks In Excess of $400,000                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)       340,000 400,000 400,000          
Ceded Commercial Property Risks In Excess of $200,000                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)       300,000              
Ceded Commercial Property Risks In Excess of $400,000                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)         200,000            
40% Cede of Commercial Liability Risks In Excess of $400,000                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)           $ 400,000          
Reinsurance retention policy, reinsured percentage           40.00%          
60% Cede of Commercial Liability Risks In Excess of $300,000                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)           $ 300,000          
Reinsurance retention policy, reinsured percentage           60.00%          
Ceded Homeowners Specific Risks In Excess of $300,000                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)       300,000 $ 300,000 $ 300,000          
Property Risk | Property, Liability and Casualty Insurance Product Line                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)       300,000              
Amount reinsured       7,700,000              
Liability Risk                      
Effects Of Reinsurance [Line Items]                      
Percentage of ceding commission   40.00%     40.00%            
Workers Compensation and Casualty Clash                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)       1,000,000.0       1,000,000.0      
Amount reinsured       29,000,000.0       19,000,000.0      
Casualty Clash                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)         $ 20,000,000.0            
Reinsurance retention policy, reinsured percentage         87.00%            
Amount reinsured         $ 10,000,000.0            
Commercial Auto Physical Damage Risk                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)       400,000              
Liability Reinsurance Policy                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)                 400,000    
Amount reinsured                 $ 600,000    
Property Reinsurance Policy | Homeowners Lines                      
Effects Of Reinsurance [Line Items]                      
Amount reinsured             1,700,000        
Property Reinsurance Policy | Commercial Lines                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)         200,000 300,000          
Amount reinsured         7,800,000 7,700,000          
Property Reinsurance Policy | Property, Liability and Casualty Insurance Product Line                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)       2,000,000.0 2,000,000.0 2,000,000.0          
Insured property value       $ 28,000,000.0 $ 28,000,000.0 $ 28,000,000.0          
Termination date       Jun. 01, 2023 Jun. 01, 2022 Jun. 01, 2021          
Property Reinsurance Policy | Maximum | Homeowners Lines                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)             $ 300,000        
Multiple Line Reinsurance Policy | Commercial Lines                      
Effects Of Reinsurance [Line Items]                      
Amount retained (excess of)               400,000      
Amount reinsured               $ 600,000      
Quota Share Reinsurance Agreement | Minimum | Commercial Lines                      
Effects Of Reinsurance [Line Items]                      
Reinsurance retention policy, reinsured percentage         90.00%            
Quota Share Reinsurance Agreement | Maximum | Commercial Lines                      
Effects Of Reinsurance [Line Items]                      
Reinsurance retention policy, reinsured percentage         100.00%            
Quota Share Reinsurance Agreement, Other Arrangements | Maximum | Other insurance product line                      
Effects Of Reinsurance [Line Items]                      
Reinsurance retention policy, reinsured percentage       100.00%              
Insurance Fronting Arrangement                      
Effects Of Reinsurance [Line Items]                      
Assumed premiums written       $ 42,200,000 $ 34,300,000 $ 28,900,000          
Fleming Reinsurance Ltd | Loss Portfolio Transfer (“LPT”) Reinsurance Agreement                      
Effects Of Reinsurance [Line Items]                      
Stated net reserves retained                   $ 40,800,000  
Losses and loss adjustment expenses, net $ 5,500,000                    
One-time risk fee retained                   5,400,000  
Amount reinsured 40,800,000                    
Fleming Reinsurance Ltd | Loss Portfolio Transfer (“LPT”) Reinsurance Agreement | Accident Year 2019                      
Effects Of Reinsurance [Line Items]                      
Reinsurance recoverables on paid losses                   66,300,000  
Stated net reserves retained                   $ 40,800,000  
Prior period 20,000,000.0                    
Fleming Reinsurance Ltd | Minimum | Loss Portfolio Transfer (“LPT”) Reinsurance Agreement                      
Effects Of Reinsurance [Line Items]                      
Reinsurance recoverables on paid losses 46,300,000                    
Fleming Reinsurance Ltd | Maximum | Loss Portfolio Transfer (“LPT”) Reinsurance Agreement                      
Effects Of Reinsurance [Line Items]                      
Reinsurance recoverables on paid losses $ 66,300,000                    
Corridor | Agreement between CIC and WPIC and Fleming Re                      
Effects Of Reinsurance [Line Items]                      
Losses and loss adjustment expenses, net       5,500,000              
Layer | Minimum | Agreement between CIC and WPIC and Fleming Re                      
Effects Of Reinsurance [Line Items]                      
Losses and loss adjustment expenses, net       644,000              
Layer | Maximum | Agreement between CIC and WPIC and Fleming Re                      
Effects Of Reinsurance [Line Items]                      
Losses and loss adjustment expenses, net       $ 20,000,000.0