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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
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 2.20%   2.20%          
Estimated Future Premium Payments Maximum Discounted Rate 3.30%   3.30%          
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 $ 6,273,000 $ 5,848,000 $ 6,273,000 $ 5,848,000 $ 6,194,000 $ 6,376,000 $ 5,884,000 $ 6,207,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 164,000 72,000 18,000 201,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 14,000 (22,000) 63,000 (398,000)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (98,000) (86,000) (185,000) (162,000)        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     18,000 201,000        
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 80,000 66,000 80,000 66,000 76,000 78,000 66,000 72,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 0 0 1,000 1,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 4,000 0 3,000 (6,000)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements 0 0 (1,000) (1,000)        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     1,000 0        
Fair Value, Inputs, Level 3 [Member] | Other Assets [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 0 2,000 0 2,000 1,000 1,000 3,000 3,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 0 0 0 (1,000)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (1,000)   (1,000) 0        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     0 (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 74,000 86,000 74,000 86,000   84,000    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings     (6,000)          
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 Purchases     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements     (4,000)          
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     (6,000)          
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               3,108,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       20,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       (201,000)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales       0        
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       20,000        
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               2,957,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       158,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       (192,000)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements       (17,000)        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       158,000        
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 2,943,000 2,787,000 2,943,000 2,787,000   2,998,000    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings     74,000          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     30,000          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements     (160,000)          
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     74,000          
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 2,943,000 2,787,000 2,943,000 2,787,000 2,948,000   2,932,000  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 65,000 (67,000)            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 5,000 (11,000)            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (76,000) (67,000)            
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               $ 66,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       23,000        
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 Purchases       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements       (3,000)        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       23,000        
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 74,000 86,000 74,000 86,000 65,000   77,000  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 11,000 11,000            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (2,000) (2,000)            
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 3,175,000 2,907,000 3,175,000 2,907,000   $ 3,215,000    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings     (50,000)          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     31,000          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements     (19,000)          
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     (50,000)          
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 3,175,000 2,907,000 $ 3,175,000 $ 2,907,000 $ 3,103,000   $ 2,806,000  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 87,000 128,000            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 5,000 (11,000)            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements $ (19,000) $ (17,000)