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Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
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 Value $ 79,421 $ 72,094 $ 79,421 $ 72,094     $ 74,318   $ 68,802
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 79,421 72,094 79,421 72,094   $ 808,557   $ 72,071  
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0              
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings 530 376              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 4,926 3,218              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances 0 0              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (353) (302)              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three     0 (5,309)          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings     1,301 35,842          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     7,040 (52,804)          
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 Settlements     (991) (714,192)          
Non-Agency RMBS [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 Value 0 0 0 0     0   0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 0 0 0 0   736,017   0  
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     0 0          
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0              
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings 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, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three     0 (5,309)          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings     0 34,727          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     0 (52,138)          
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 (713,297)          
Residential Mortgage-Backed Securities [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances 0 0              
Asset-backed Securities [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 Value 79,421 72,094 79,421 72,094     74,318   68,802
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 79,421 72,094 79,421 72,094   72,540   72,071  
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0              
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings 530 376              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 4,926 3,218              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances 0 0              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (353) (302)              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings     1,301 1,115          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     7,040 (666)          
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     (991) (895)          
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 73,152   73,152         47,460  
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     28,876            
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     28,876            
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     (3,184)            
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 73,152 43,412 73,152 43,412     63,131   46,939
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 11,106 (2,330)              
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 11,106 (2,330)              
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 (1,085) (1,197)              
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 (422)   (422)         (1,459)  
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     1,035            
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     1,311            
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     (274)            
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 (422) (1,175) (422) (1,175)     (861)   (1,326)
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 437 151              
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 528 250              
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 (89) (99)              
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 72,730 42,237 72,730 42,237   60,808 62,270 46,001 45,613
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 11,543 (2,179) 29,911 (14,433)          
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 11,634 (2,080) 30,187 (14,137)          
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 (1,174) (1,296) (3,458) 4,434          
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   (1,175)   (1,175)   (566)      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       (609)          
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       (313)          
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       296          
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   43,412   43,412   61,374      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       (13,824)          
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       (13,824)          
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       (4,138)          
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 6,116,972 7,169,406 6,116,972 7,169,406   12,561,185 7,080,205 6,930,446 11,110,155
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 332,226 (36,696) 639,287 (129,521)          
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 Out Of Level Three         $ 5,309        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Deconsolidation Of Vies 627,326 3,709,113   (3,709,113)   627,326      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 344,563 (36,221) 697,976 (84,608)          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (213,105) (122,362) (241,003) (435,776)          
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            
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 (467,365) (73,053) (643,121) (1,156,973)          
Level 3 [Member] | Investments Contract [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   2,718,377   2,718,377          
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 Deconsolidation Of Vies 0                
Level 3 [Member] | Loans [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   4,563,091   4,563,091          
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 Deconsolidation Of Vies (850,605)                
Level 3 [Member] | Long-term Debt [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   (231,280)   (231,280)          
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 Deconsolidation Of Vies 223,279                
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           60,808      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       (14,433)          
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 Out Of Level Three         0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Deconsolidation Of Vies       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       (14,137)          
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 Sales       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements       (4,434)          
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 79,421 72,094 79,421 72,094   808,557 74,318 72,071 68,802
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     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 Transfers Out Of Level Three         5,309        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Deconsolidation Of Vies 0     0   0      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 530 376 1,301 35,842          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 4,926 3,218 7,040 (52,804)          
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            
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 (353) (302) (991) (714,192)          
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 3,388 4,887 3,388 4,887   5,979 3,771 4,516 5,255
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held (383) (368) (1,128) (1,092)          
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 Out Of Level Three         0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Deconsolidation Of Vies 0     0   0      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (383) (368) (1,128) (1,092)          
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            
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          
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 72,730 42,237 72,730 42,237       46,001  
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     29,911            
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 Deconsolidation Of Vies 0         0      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings     30,187            
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     (3,458)            
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 72,730 42,237 72,730 42,237     62,270   45,613
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 11,543 (2,179)              
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 11,634 (2,080)              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (1,174) (1,296)              
Variable Interest Entity, Primary Beneficiary [Member]                  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                  
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     610,504 (113,996)          
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Investments Contract [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 2,995,894   2,995,894         2,737,286  
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     381,716            
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 Deconsolidation Of Vies           0      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings     381,716            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     (105,924)            
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     (17,184)            
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Loans [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 2,965,539   2,965,539         4,287,664  
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     228,788            
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 Deconsolidation Of Vies   5,946,465       850,605      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings     300,503            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     (150,535)            
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     (621,488)            
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Long-term Debt [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 (231,280) 0 (231,280)   (2,757,688) (230,615) $ (217,092) (2,517,638)
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 0 3,101 0 37,637          
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 Out Of Level Three         0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Deconsolidation Of Vies   (2,237,352)   2,237,352   (223,279)      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 0 3,101 (14,603) 180,314          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 7,336 28,064 8,416 85,837          
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            
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 17,841 0 (22,905)          
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Loans Receivable [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           11,529,384      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       (70,659)          
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 Out Of Level Three         0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Deconsolidation Of Vies       (5,946,465)          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       (204,561)          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       (371,610)          
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 Sales       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements       (443,657)          
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Loans Receivable [Member] | Loans [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 2,965,539 4,563,091 2,965,539 4,563,091     4,288,572   10,751,199
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 114,825 (29,439)              
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 126,541 (29,439)              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (133,131) (122,908)              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (465,838) (89,296)              
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Corporate Debt Securities [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           $ 2,914,145      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       (80,974)          
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 Out Of Level Three         $ 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Deconsolidation Of Vies       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       (80,974)          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       (97,199)          
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 Sales       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements       (17,595)          
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Corporate Debt Securities [Member] | Investments Contract [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 2,995,894 2,718,377 $ 2,995,894 $ 2,718,377     $ 2,881,889   $ 2,756,924
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 206,241 (7,811)              
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 206,241 (7,811)              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss $ (92,236) $ (30,736)