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Borrowings and Financing Activities - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Securities | Fixed-maturities available for sale |  |
Debt Instrument [Line Items] |  |
Investments serving as collateral for FHLB advances | $ 163,900,000 | $ 167,300,000
Senior notes |  |
Debt Instrument [Line Items] |  |
Mortgage financing facilities outstanding | $ 1,413,504,000 | $ 1,409,473,000
Senior notes | Senior Notes Due 2024, 2025 and 2027 |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage of principal amount | 100.00% |
Basis spread on variable rate | 0.50% |
Stock retention percentage required in order to make capital stock transactions | 80.00% |
FHLB advances |  |
Debt Instrument [Line Items] |  |
FHLB maturity period | 90 days |
Federal Home Loan Bank certificates and obligations | Minimum |  |
Debt Instrument [Line Items] |  |
FHLB ratio of market value to collateral advances | 1.03 |
Federal Home Loan Bank certificates and obligations | Maximum |  |
Debt Instrument [Line Items] |  |
FHLB ratio of market value to collateral advances | 1.14 |
Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Line of credit facility, higher borrowing capacity option | $ 400,000,000 |
Line of credit facility, fair value of amount outstanding | 0 |
Revolving credit facility | Unsecured revolving credit facility, expiration date 2026 |  |
Debt Instrument [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 275,000,000 |
Mortgages | Mortgage financing facilities |  |
Debt Instrument [Line Items] |  |
Mortgage financing facilities outstanding | $ 2,100,000 |

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