Policy Liabilities - Schedule of Policyholder Account Balance, Guaranteed Minimum Crediting Rate (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
51-150 basis points above | Minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range above guaranteed minimum crediting rates (percent)	0.0051	0.0051	0.0051
51-150 basis points above | Maximum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range above guaranteed minimum crediting rates (percent)	0.0150	0.0150	0.0150
Interest Sensitive Life
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	$ 723,389	$ 732,948	$ 739,105	$ 745,335
Interest Sensitive Life | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	723,389	732,948	739,105
Interest Sensitive Life | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	$ 0	$ 0	$ 0
Interest Sensitive Life | Less than 3.00% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates (percent)	3.00%	3.00%	3.00%
Range of guaranteed minimum crediting rates	$ 0	$ 0	$ 0
Interest Sensitive Life | Less than 3.00% | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates (percent)	3.00%	3.00%	3.00%
Range of guaranteed minimum crediting rates	$ 0	$ 0	$ 0
Interest Sensitive Life | 3.00%-3.99% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	$ 29,251	$ 29,086	$ 28,867
Interest Sensitive Life | 3.00%-3.99% | At guaranteed minimum | Minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates (percent)	3.00%	3.00%	3.00%
Interest Sensitive Life | 3.00%-3.99% | At guaranteed minimum | Maximum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates (percent)	3.99%	3.99%	3.99%
Interest Sensitive Life | 3.00%-3.99% | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	$ 0	$ 0	$ 0
Interest Sensitive Life | 3.00%-3.99% | 51-150 basis points above | Minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates (percent)	3.00%	3.00%	3.00%
Interest Sensitive Life | 3.00%-3.99% | 51-150 basis points above | Maximum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates (percent)	3.99%	3.99%	3.99%
Interest Sensitive Life | 4.00%-4.99% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	$ 604,412	$ 613,704	$ 620,594
Interest Sensitive Life | 4.00%-4.99% | At guaranteed minimum | Minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates (percent)	4.00%	4.00%	4.00%
Interest Sensitive Life | 4.00%-4.99% | At guaranteed minimum | Maximum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates (percent)	4.99%	4.99%	4.99%
Interest Sensitive Life | 4.00%-4.99% | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	$ 0	$ 0	$ 0
Interest Sensitive Life | 4.00%-4.99% | 51-150 basis points above | Minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates (percent)	4.00%	4.00%	4.00%
Interest Sensitive Life | 4.00%-4.99% | 51-150 basis points above | Maximum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates (percent)	4.99%	4.99%	4.99%
Interest Sensitive Life | Greater than 5.00% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates (percent)	5.00%	5.00%	5.00%
Range of guaranteed minimum crediting rates	$ 89,726	$ 90,158	$ 89,644
Interest Sensitive Life | Greater than 5.00% | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates (percent)	5.00%	5.00%	5.00%
Range of guaranteed minimum crediting rates	$ 0	$ 0	$ 0
Deferred Annuity
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	656,573	773,039	954,318	1,033,525
Deferred Annuity | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	656,573	773,039	954,318
Deferred Annuity | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	0	0	0
Deferred Annuity | Less than 3.00% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	1,812	1,945	2,040
Deferred Annuity | Less than 3.00% | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	0	0	0
Deferred Annuity | 3.00%-3.99% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	473,191	574,939	743,299
Deferred Annuity | 3.00%-3.99% | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	0	0	0
Deferred Annuity | 4.00%-4.99% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	181,570	195,390	208,979
Deferred Annuity | 4.00%-4.99% | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	0	0	0
Deferred Annuity | Greater than 5.00% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	0	765	0
Deferred Annuity | Greater than 5.00% | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	0	0	0
Other premium
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	468,604	236,958	123,236	$ 99,468
Other premium | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	468,604	186,891	123,236
Other premium | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	0	50,067	0
Other premium | Less than 3.00% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	373,584	138,684	23,042
Other premium | Less than 3.00% | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	0	0	0
Other premium | 3.00%-3.99% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	3,182	3,790	4,074
Other premium | 3.00%-3.99% | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	0	0	0
Other premium | 4.00%-4.99% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	55,876	6,861	58,251
Other premium | 4.00%-4.99% | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	0	50,067	0
Other premium | Greater than 5.00% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	35,962	37,556	37,869
Other premium | Greater than 5.00% | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	$ 0	$ 0	$ 0