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Fair Value Measurements - Information about Valuation Inputs for Variable Interest Entity Assets and Liabilities Classified as Level 3 (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Variable Interest Entity, Primary Beneficiary [Member]                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)                  
Estimated Future Premium Payments Minimum Discounted Rate 5.80%   5.80%   5.30%        
Estimated Future Premium Payments Maximum Discounted Rate 8.20%   8.20%   7.80%        
Fair Value, Inputs, Level 3 [Member]                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)                  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability $ 3,672,000 $ 3,831,000 $ 3,672,000 $ 3,831,000   $ 3,782,000 $ 3,848,000 $ 3,972,000 $ 3,762,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (19,000) (124,000) 16,000 73,000          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 15,000 64,000 (23,000) 152,000          
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, Inputs, Level 3 [Member] | Investments [Member]                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)                  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 77,000 81,000 77,000 81,000   87,000 87,000 81,000 79,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 7,000 0 7,000 1,000          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 9,000 0 9,000 3,000          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (26,000) 0 (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, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]                  
Fair Value Inputs, Liabilities, 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 Gain Loss Included In Earnings     (8,000)            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements     0            
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     (8,000)            
Fair Value, Inputs, Level 3 [Member] | Loans Receivable [Member] | Variable Interest Entity, Primary Beneficiary [Member]                  
Fair Value Inputs, Liabilities, 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 Gain Loss Included In Earnings       (7,000)          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       92,000          
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)          
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member]                  
Fair Value Inputs, Liabilities, 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 Gain Loss Included In Earnings       80,000          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       57,000          
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          
Loan Origination Commitments [Member] | Fair Value, Inputs, Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]                  
Fair Value Inputs, Liabilities, 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 Gain Loss Included In Earnings     49,000            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     (14,000)            
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            
Loan Origination Commitments [Member] | Fair Value, Inputs, Level 3 [Member] | Loans Receivable [Member] | Variable Interest Entity, Primary Beneficiary [Member]                  
Fair Value Inputs, Liabilities, 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   1,604,000   1,856,000  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 29,000 (66,000)              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 3,000 50,000              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (68,000) (69,000)              
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]                  
Fair Value Inputs, Liabilities, 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 Gain Loss Included In Earnings       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements       0          
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       0          
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]                  
Fair Value Inputs, Liabilities, 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   21,000   31,000  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (3,000) (5,000)              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements 0 0              
Investment Contracts [Member] | Fair Value, Inputs, Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]                  
Fair Value Inputs, Liabilities, 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 Gain Loss Included In Earnings     (32,000)            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     (18,000)            
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)            
Investment Contracts [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member]                  
Fair Value Inputs, Liabilities, 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   $ 2,070,000   $ 2,003,000  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (51,000) (53,000)              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 3,000 14,000              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements $ (12,000) $ (12,000)