Debt - Additional Information (Details) - USD ($)	3 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
FHLB stock	$ 16,000,000	$ 14,300,000
Long-term debt, net, book value	1,793,928,000	1,793,452,000
Total short-term debt, par value	515,612,000
Federal Home Loan Bank Borrowings
Debt Instrument [Line Items]
Total short-term debt, par value	45,000,000	0
Estimate of Fair Value Measurement \| Asset Pledged as Collateral
Debt Instrument [Line Items]
Fair value of pledged assets	$ 850,000,000
Junior Subordinated Debentures Due 2056
Debt Instrument [Line Items]
Coupon Rate	4.25%
Senior notes
Debt Instrument [Line Items]
Optional redemption, period from issuance date	5 years
Federal Home Loan Bank Borrowings
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 633,000,000
Long-term debt, net, book value	$ 43,000,000	$ 23,000,000

Debt Instrument, Redemption, Optional Redemption, Period From Issuance

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- Definition

Short-term debt, face amount

+ References

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

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No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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