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Investments - Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Gross investment income, operating |  | $ 38,387 | $ 37,383 | $ 73,895 | $ 73,867
Investment expenses |  | (1,288) | (1,353) | (2,376) | (2,637)
Investment income net of investment expenses |  | 37,099 | 36,030 | 71,519 | 71,230
Interest expense on surplus note |  | (15,815) | (15,495) | (31,330) | (30,642)
Net investment income |  | 21,284 | 20,535 | 40,189 | 40,588
Equity Securities [Member] |  |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Gross investment income, operating |  | 371 | 411 | 758 | 803
Policy Loans and Other Invested Assets [Member] |  |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Gross investment income, operating |  | 58 | 98 | 160 | 329
Cash and Cash Equivalents [Member] |  |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Gross investment income, operating |  | 498 | 156 | 623 | 275
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] | (769) | 1,068 | (2,279) | 1,643
Available-for-Sale [Member] | Fixed Maturities |  |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Gross investment income, operating |  | 22,414 | 20,155 | 43,303 | 40,175
Held-to-Maturity [Member] | Fixed Maturities |  |  |  |  |
Schedule of Net Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Gross investment income, operating |  | $ 15,815 | $ 15,495 | $ 31,330 | $ 30,642
[1] | For the three and six months ended June 30, 2022, includes $(1.3) million and $(3.4) million, respectively, of net losses recognized for the change in fair value of the deposit asset underlying the 10% coinsurance agreement. For the three and six months ended June 30, 2021, includes $(0.2) million and $(1.0) million, respectively, of net losses recognized for the change in fair value of the deposit asset underlying the 10% coinsurance agreement.

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- Definition Amount, before investment expense, of income earned or loss recognized from investments in securities. Includes, but is not limited to, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References No definition available. + Details
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