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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)                
Fair Value Inputs Yield Rate 6.00%     6.00%        
Asset-backed Securities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)                
Coupon rate 5.98%     5.98%   5.97%    
Fair Value Inputs Maturity     14 years 9 months 29 days 14 years 3 months 21 days        
Yield 10.25%     10.25%   10.50%    
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 $ 6,132,000 $ 5,974,000 $ 6,273,000 $ 6,132,000 $ 5,974,000 $ 6,376,000 $ 5,848,000 $ 6,207,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 76,000 (40,000)   94,000 161,000      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (146,000) 246,000   (83,000) (152,000)      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases 13,000     13,000 0      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (83,000) (80,000)   (269,000) (242,000)      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       94,000 160,000      
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 75,000 (41,000)            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI (146,000) 246,000   (83,000) (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 91,000 75,000 80,000 91,000 75,000 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 (2,000) 9,000   1,000 3,000      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases 13,000     13,000 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, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI (2,000) 9,000   1,000 3,000      
Fair Value, Inputs, Level 3 [Member] | Other Assets [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 0 2,000 0 0 2,000 1,000 2,000 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 Settlements       (1,000) 0      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       0 (1,000)      
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0 0   0 0      
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 72,000 85,000   72,000 85,000 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 Settlements       (6,000)        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       (6,000)        
Derivative [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 72,000 85,000 74,000 72,000 85,000 84,000 86,000 66,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 0 1,000   (6,000) 24,000      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 0 0   0 0      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases 0 0   0 0      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (2,000) (2,000)   (6,000) 5,000      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       (6,000) 23,000      
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 0 1,000            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0 0   0 0      
Interest Rate Swap [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 72,000     72,000   85,000    
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       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 Settlements       (6,000)        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       (7,000)        
Credit Derivative [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 0     0   0    
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 Purchases       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        
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       3 years        
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               66,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings         24,000      
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 Settlements         (5,000)      
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, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 72,000 85,000 74,000 $ 72,000 85,000   86,000  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 0 1,000            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (2,000) (2,000)            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 0 1,000            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0 0   0 0      
Credit Derivative [Member] | Derivative [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   (1,000)     (1,000)     0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings         (1,000)      
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 Settlements         0      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held         (1,000)      
Credit Derivative [Member] | Credit Derivative [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 0 (1,000) 0 0 (1,000)   (1,000)  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 0 0            
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 Settlements 0 0            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0 0   0 0      
Interest Rate Swap [Member] | Derivative [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   86,000     86,000     67,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings         24,000      
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 Settlements         (5,000)      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held         24,000      
Interest Rate Swap [Member] | Interest Rate Swap [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 72,000 86,000 75,000 72,000 86,000   87,000  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (1,000) 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 Settlements (2,000) (2,000)            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) (1,000) 1,000            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0 0     0      
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               2,957,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings         160,000      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss         (71,000)      
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 Settlements         (17,000)      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held         160,000      
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               $ 3,108,000
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings         (22,000)      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss         (85,000)      
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 Settlements         (219,000)      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held         (22,000)      
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 3,184,000 3,029,000   3,184,000 3,029,000 3,215,000    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       35,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       (46,000)        
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 Settlements       (19,000)        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       35,000        
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 3,184,000 3,029,000 3,175,000 3,184,000 3,029,000   2,907,000  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 85,000 1,000            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (77,000) 121,000            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 85,000 1,000            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI (77,000) 121,000   (46,000) (71,000)      
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 2,784,000 2,783,000   2,784,000 2,783,000 $ 2,998,000    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       65,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       (38,000)        
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 Settlements       (241,000)        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       65,000        
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 2,784,000 2,783,000 $ 2,943,000 2,784,000 2,783,000   $ 2,787,000  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (10,000) (43,000)            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (67,000) 116,000            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (81,000) (78,000)            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) (10,000) (43,000)            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI $ (67,000) $ 116,000   $ (38,000) $ (85,000)