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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating $ 35,508 $ 36,482
Investment expenses (1,088) (1,284)
Investment income net of investment expenses 34,420 35,198
Interest expense on surplus note (15,515) (15,146)
Net investment income 18,905 20,052
Equity Securities [Member]    
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating 387 391
Policy Loans and Other Invested Assets [Member]    
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating 102 231
Cash and Cash Equivalents [Member]    
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating 125 119
Total return on deposit asset underlying 10% insurance agreement [Member]    
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating [1] (1,510) 575
Available-for-Sale [Member] | Fixed Maturities    
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating 20,889 20,020
Held-to-Maturity [Member] | Fixed Maturities    
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items]    
Gross investment income, operating $ 15,515 $ 15,146
[1] Included $(2.1) million and $(0.8) million of net gains (losses) recognized for the change in fair value of the deposit asset underlying the 10% coinsurance agreement for the three months ended March 31, 2022 and 2021, respectively.