Debt - Narrative (Details) - USD ($)		12 Months Ended
	Sep. 15, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	[1]	Dec. 31, 2021	Jul. 12, 2021	Jul. 11, 2021
Debt Instrument [Line Items]
Principal repayment on Revolving Credit Facility		$ 0	$ 249,000,000.0	$ 0
Purchase of FHLB activity-based common stock as percentage of borrowing, percentage, authorized		15.00%				25.00%
Senior Notes
Debt Instrument [Line Items]
Principal amount			$ 250,000,000.0
Stated rate			4.50%
Effective interest percentage			4.53%
Senior Notes | 2023 Senior Notes
Debt Instrument [Line Items]
Principal amount	$ 300,000,000	$ 300,000,000.0	$ 300,000,000.0
Stated rate	7.25%	7.25%
Effective interest percentage	7.29%
Debt redemption price, percentage	100.00%
Debt redemption price, interest discounted at treasury yield margin	0.45%
Available borrowing		$ 325,000,000
Commitment fee percent		0.15%
Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate		1.15%
Commitment fee percent		0.15%
Borrowing capacity							$ 325,000,000.0	$ 225,000,000.0
Line of Credit | Senior Notes | 2023 Senior Notes
Debt Instrument [Line Items]
Basis spread on variable rate		1.15%
Revolving Credit Facility
Debt Instrument [Line Items]
Principal borrowings on Revolving Credit Facility		$ 114,000,000
Revolving Credit Facility | Senior Notes | 2023 Senior Notes
Debt Instrument [Line Items]
Principal repayment on Revolving Credit Facility	$ 249,000,000

[1] Recast for the adoption of ASU 2018-12.