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Reinsurance Recoverable, Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables on Unpaid Losses, Gross $ 601,668 $ 589,269  
Reinsurance Recoverable, Allowance for Credit Loss (1,600) (1,777) $ (4,400)
Reinsurance Recoverables, net of allowance for credit losses 600,068 587,492  
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross [Member] | Financial Asset, Not Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 598,317 585,408  
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross [Member] | Financial Asset, Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 3,351 3,861  
Total federal and state pools [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 116,378 82,575  
Total federal and state pools [Member] | Financial Asset, Not Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 116,378 82,575  
Total federal and state pools [Member] | Financial Asset, Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0 0  
Other Federal And State Pools [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 5,047 3,244  
Other Federal And State Pools [Member] | Financial Asset, Not Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 4,597 2,676  
Other Federal And State Pools [Member] | Financial Asset, Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 450 568  
Total Non Rated Reinsurer [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 121,425 85,819  
Total Non Rated Reinsurer [Member] | Financial Asset, Not Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 120,975 85,251  
Total Non Rated Reinsurer [Member] | Financial Asset, Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 450 568  
AM Best, A++ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 38,610 37,566  
AM Best, A++ Rating [Member] | Financial Asset, Not Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 38,601 37,464  
AM Best, A++ Rating [Member] | Financial Asset, Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 9 102  
AM Best, A+ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 341,377 357,298  
AM Best, A+ Rating [Member] | Financial Asset, Not Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 339,857 354,846  
AM Best, A+ Rating [Member] | Financial Asset, Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 1,520 2,452  
AM Best, A Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 96,902 106,067  
AM Best, A Rating [Member] | Financial Asset, Not Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 95,675 105,652  
AM Best, A Rating [Member] | Financial Asset, Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 1,227 415  
AM Best, A- Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 3,354 2,139  
AM Best, A- Rating [Member] | Financial Asset, Not Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 3,209 2,139  
AM Best, A- Rating [Member] | Financial Asset, Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 145 0  
AM Best, B++ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0 380  
AM Best, B++ Rating [Member] | Financial Asset, Not Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0 56  
AM Best, B++ Rating [Member] | Financial Asset, Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0 324  
AM Best, B+ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0 0  
AM Best, B+ Rating [Member] | Financial Asset, Not Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0 0  
AM Best, B+ Rating [Member] | Financial Asset, Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0 0  
AM Best Rated Reinsurer [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 480,243 503,450  
AM Best Rated Reinsurer [Member] | Financial Asset, Not Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 477,342 500,157  
AM Best Rated Reinsurer [Member] | Financial Asset, Past Due      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross $ 2,901 $ 3,293