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Variable Interest Entities and Noncontrolling Interests - Other variable interest entity disclosures (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Variable Interest Entity [Line Items] |  |
Total VIE Assets | $ 41,199,648 | $ 37,885,361
Maximum Exposure to Loss | 1,906,196 | 1,848,679
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 3,035,349 | 3,425,833
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | (4,708) | (5,197)
Maximum Exposure to Loss - Off-Balance Sheet | 78,322 | 42,084
Maximum Exposure to Loss | 73,614 | 36,887
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2017-1 Ltd. (Oct-17) |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 145,573 | 216,429
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | (295) | (442)
Maximum Exposure to Loss - Off-Balance Sheet | 2,469 | 2,794
Maximum Exposure to Loss | 2,174 | 2,352
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2018-1 Ltd. (Apr-18) |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 250,095 | 328,482
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | (1,244) | (1,574)
Maximum Exposure to Loss - Off-Balance Sheet | 5,597 | 5,757
Maximum Exposure to Loss | 4,353 | 4,183
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2018-2 Ltd. (Aug-18) |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 272,685 | 437,009
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | (1,206) | (877)
Maximum Exposure to Loss - Off-Balance Sheet | 4,210 | 2,524
Maximum Exposure to Loss | 3,004 | 1,647
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2018-3 Ltd. (Oct-18) |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 302,563 | 426,806
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | (1,883) | (1,113)
Maximum Exposure to Loss - Off-Balance Sheet | 8,387 | 3,937
Maximum Exposure to Loss | 6,504 | 2,824
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2019-1 Ltd. (Mar-19) |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 219,256 | 257,358
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | (83) | (226)
Maximum Exposure to Loss - Off-Balance Sheet | 10,251 | 3,027
Maximum Exposure to Loss | 10,168 | 2,801
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2019-2 Ltd. (Apr-19) |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 398,316 | 525,959
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | 54 | (78)
Maximum Exposure to Loss - Off-Balance Sheet | 13,088 | 2,579
Maximum Exposure to Loss | 13,142 | 2,501
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2019-3 Ltd. (Jul-19) |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 528,084 | 656,523
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | (248) | (585)
Maximum Exposure to Loss - Off-Balance Sheet | 10,649 | 9,273
Maximum Exposure to Loss | 10,401 | 8,688
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2019-4 Ltd. (Oct-19) |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 468,737 | 577,267
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | 257 | (302)
Maximum Exposure to Loss - Off-Balance Sheet | 14,687 | 12,193
Maximum Exposure to Loss | 14,944 | $ 11,891
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-1 Ltd. (Jun-20) |  |
Variable Interest Entity [Line Items] |  |
Total VIE Assets | 450,040 |
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability | (60) |
Maximum Exposure to Loss - Off-Balance Sheet | 8,984 |
Maximum Exposure to Loss | 8,924 |
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-1 Ltd. (Jun-20) | Funded by directly provided capacity |  |
Variable Interest Entity [Line Items] |  |
Initial Coverage, Amount | $ 78,500 |

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