Fair Value Measurements - Information about Valuation Inputs for Fixed Income Securities Classified as Level 3 (Details) - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2024

Mar. 31, 2024

Jun. 30, 2023

Jun. 30, 2024

Jun. 30, 2023

Dec. 31, 2023

Mar. 31, 2023

Dec. 31, 2022

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Inputs Yield Rate

11.20%

Asset-backed Securities [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Coupon rate

5.98%

5.97%

Fair Value Inputs Maturity

12 years 9 months 18 days

12 years 5 months 19 days

Yield

10.00%

12.00%

Fair Value, Inputs, Level 3 [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

$ 3,672,000

$ 3,782,000

$ 3,831,000

$ 3,672,000

$ 3,831,000

$ 3,848,000

$ 3,972,000

$ 3,762,000

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(106,000)

(81,000)

(170,000)

(155,000)

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

16,000

73,000

Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)

(19,000)

(124,000)

Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI

15,000

64,000

(23,000)

152,000

Fair Value, Inputs, Level 3 [Member] | Investments [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

77,000

$ 87,000

81,000

77,000

81,000

87,000

81,000

79,000

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(26,000)

(27,000)

(1,000)

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

7,000

1,000

Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)

7,000

Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI

9,000

3,000

Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

18,000

25,000

18,000

25,000

26,000

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

(8,000)

Corporate Obligations [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Inputs Maturity

10 months 20 days

Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

26,000

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

18,000

$ 21,000

25,000

18,000

25,000

31,000

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)

(3,000)

(5,000)

Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI

Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Obligations [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

1,828,000

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(12,000)

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

80,000

Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Inputs, Level 3 [Member] | Loans Receivable [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

$ 1,829,000

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(141,000)

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

(7,000)

Variable Interest Entity, Primary Beneficiary [Member] | Investment Contracts [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

2,010,000

1,952,000

2,010,000

1,952,000

2,072,000

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(12,000)

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

(32,000)

Variable Interest Entity, Primary Beneficiary [Member] | Investment Contracts [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Obligations [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

2,010,000

2,070,000

1,952,000

2,010,000

1,952,000

2,003,000

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(12,000)

Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)

(51,000)

(53,000)

Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI

3,000

14,000

(18,000)

57,000

Variable Interest Entity, Primary Beneficiary [Member] | Loan Origination Commitments [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

1,567,000

1,772,000

1,567,000

1,772,000

$ 1,663,000

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(132,000)

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

49,000

Variable Interest Entity, Primary Beneficiary [Member] | Loan Origination Commitments [Member] | Fair Value, Inputs, Level 3 [Member] | Loans Receivable [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

1,567,000

$ 1,604,000

1,772,000

1,567,000

1,772,000

$ 1,856,000

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(68,000)

(69,000)

Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)

29,000

(66,000)

Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI

$ 3,000

$ 50,000

$ (14,000)

$ 92,000