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Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
level3FinancialInstruments
Jun. 30, 2020
USD ($)
level3FinancialInstruments
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset or Liability, Transfers into or out of Level 3 | level3FinancialInstruments     0 0        
Interest Rate Swap [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability $ 75,000   $ 75,000     $ 85,000    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)          
Interest Rate Swap [Member] | Interest Rate Swap [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 75,000 $ 87,000 75,000 $ 87,000 $ 66,000   $ 79,000  
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 11,000 10,000            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0 0   0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 11,000 10,000            
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 (2,000) (2,000)            
Credit Derivative [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 0   0     0    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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 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     0          
Credit Derivative [Member] | Credit Derivative [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 0 (1,000) 0 (1,000) 0   (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        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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 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 0 0            
Derivative [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 74,000 86,000 74,000 86,000 65,000 84,000 77,000 $ 66,000
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 11,000 10,000            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 11,000 11,000 (6,000) 23,000        
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 Issues 0 0 0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales 0 0 0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (2,000) (2,000) (4,000) 3,000        
Derivative [Member] | Credit Derivative [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability   (1,000)   (1,000)       0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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 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       0        
Derivative [Member] | Interest Rate Swap [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability   87,000   87,000       67,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)        
Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
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, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 164,000 71,000            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 14,000 (22,000) 63,000 (398,000)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)        
Level 3 [Member] | Investment Contracts [Member] | Variable Interest Entity, Primary Beneficiary [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
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, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)          
Level 3 [Member] | Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
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, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)          
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability               66,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)        
Level 3 [Member] | Loans Receivable [Member] | Variable Interest Entity, Primary Beneficiary [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability               3,108,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)        
Level 3 [Member] | Loans Receivable [Member] | Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
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, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 65,000 (67,000)            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 5,000 (11,000) 30,000 (201,000)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)            
Level 3 [Member] | Investments [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
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, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 4,000   3,000 (6,000)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)        
Level 3 [Member] | Other Assets [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
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, 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, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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        
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 74,000 86,000 74,000 86,000   $ 84,000    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)          
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
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, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 11,000 10,000            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)            
Level 3 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability               $ 2,957,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)        
Level 3 [Member] | Corporate Debt Securities [Member] | Investment Contracts [Member] | Variable Interest Entity, Primary Beneficiary [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
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, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 87,000 128,000            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 5,000 (11,000) $ 31,000 $ (192,000)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
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)