Policy Liabilities - Schedule of Policyholder Account Balance, Guaranteed Minimum Crediting Rate (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
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
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
Interest Sensitive Life
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	$ 720,269	$ 723,389	$ 729,721	$ 732,948
Interest Sensitive Life | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	720,269		729,721
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
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%
Range of guaranteed minimum crediting rates	$ 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%
Range of guaranteed minimum crediting rates	$ 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	$ 29,408		$ 29,176
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%
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%
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
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%
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%
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	$ 601,367		$ 610,643
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%
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%
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
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%
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%
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%
Range of guaranteed minimum crediting rates	$ 89,494		$ 89,902
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%
Range of guaranteed minimum crediting rates	$ 0		$ 0
Deferred Annuity
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	636,219	656,573	739,019	773,039
Deferred Annuity | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	636,219		739,019
Deferred Annuity | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	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	1,866		1,796
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
Deferred Annuity | 3.00%-3.99% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	455,618		545,598
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
Deferred Annuity | 4.00%-4.99% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	178,735		191,625
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
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		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
Other premium
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	463,148	$ 468,604	401,269	$ 236,958
Other premium | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	463,148		351,585
Other premium | 51-150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	0		49,684
Other premium | Less than 3.00% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	368,459		303,935
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
Other premium | 3.00%-3.99% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	3,145		3,521
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
Other premium | 4.00%-4.99% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	55,767		6,745
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		49,684
Other premium | Greater than 5.00% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Range of guaranteed minimum crediting rates	35,777		37,384
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